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2016-10-15Merge tag 'gcc-plugins-v4.9-rc1' of ↵Linus Torvalds2-1/+648
git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux Pull gcc plugins update from Kees Cook: "This adds a new gcc plugin named "latent_entropy". It is designed to extract as much possible uncertainty from a running system at boot time as possible, hoping to capitalize on any possible variation in CPU operation (due to runtime data differences, hardware differences, SMP ordering, thermal timing variation, cache behavior, etc). At the very least, this plugin is a much more comprehensive example for how to manipulate kernel code using the gcc plugin internals" * tag 'gcc-plugins-v4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: latent_entropy: Mark functions with __latent_entropy gcc-plugins: Add latent_entropy plugin
2016-10-15Merge branch 'misc' of ↵Linus Torvalds4-12/+80
git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild Pull misc kbuild changes from Michal Marek: "Just a few patches on the kbuild.git#misc branch this time: - New Coccinelle patch by Nicholas Mc Guire - Existing patch fixes by Julia Lawall - Minor comment fix by Markus Elfring" * 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: Coccinelle: flag conditions with no effect scripts/coccicheck: Update reference for the corresponding documentation Coccinelle: pm_runtime: ensure relevance of pm_runtime reports Coccinelle: limit memdup_user transformation to GFP_KERNEL case
2016-10-15Merge branch 'kbuild' of ↵Linus Torvalds7-115/+174
git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild Pull kbuild updates from Michal Marek: - EXPORT_SYMBOL for asm source by Al Viro. This does bring a regression, because genksyms no longer generates checksums for these symbols (CONFIG_MODVERSIONS). Nick Piggin is working on a patch to fix this. Plus, we are talking about functions like strcpy(), which rarely change prototypes. - Fixes for PPC fallout of the above by Stephen Rothwell and Nick Piggin - fixdep speedup by Alexey Dobriyan. - preparatory work by Nick Piggin to allow architectures to build with -ffunction-sections, -fdata-sections and --gc-sections - CONFIG_THIN_ARCHIVES support by Stephen Rothwell - fix for filenames with colons in the initramfs source by me. * 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: (22 commits) initramfs: Escape colons in depfile ppc: there is no clear_pages to export powerpc/64: whitelist unresolved modversions CRCs kbuild: -ffunction-sections fix for archs with conflicting sections kbuild: add arch specific post-link Makefile kbuild: allow archs to select link dead code/data elimination kbuild: allow architectures to use thin archives instead of ld -r kbuild: Regenerate genksyms lexer kbuild: genksyms fix for typeof handling fixdep: faster CONFIG_ search ia64: move exports to definitions sparc32: debride memcpy.S a bit [sparc] unify 32bit and 64bit string.h sparc: move exports to definitions ppc: move exports to definitions arm: move exports to definitions s390: move exports to definitions m68k: move exports to definitions alpha: move exports to actual definitions x86: move exports to actual definitions ...
2016-10-12scripts/tags.sh: enable code completion in VIMMathieu Maret1-1/+2
Vim, with the omnicppcomplete(#1) plugin, can do code completion using information build by ctags. Add flags needed by omnicppcomplete(#2) to have completion on member of structure. 1: https://github.com/vim-scripts/omnicppcomplete 2: https://github.com/vim-scripts/OmniCppComplete/blob/master/doc/omnicppcomplete.txt#L93 Link: http://lkml.kernel.org/r/20160830191546.4469-1-mathieu.maret@gmail.com Signed-off-by: Mathieu Maret <mathieu.maret@gmail.com> Cc: Michal Marek <mmarek@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-12checkpatch: improve the octal permissions testsJoe Perches1-16/+44
The function calls with octal permissions commonly span multiple lines. The current test is line oriented and fails to find some matches. Make the test use the $stat variable instead of the $line variable to span multiple lines. Also add a few functions to the known functions with permissions list. Move the SYMBOLIC_PERMS test to a separate section to find all the S_<FOO> permissions in any form not just those that have specific function names. This can now find and fix permissions uses like: .mode = S_<FOO> | S_<BAR>; Link: http://lkml.kernel.org/r/b51bab60530912aae4ac420119d465c5b206f19f.1475030406.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Tested-by: Ramiro Oliveira <roliveir@synopsys.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-12checkpatch: add warning for unnamed function definition argumentsJoe Perches1-0/+13
Function definitions without identifiers like int foo(int) are not preferred. Emit a warning when they occur. Link: http://lkml.kernel.org/r/94fe6378504745991b650f48fc92bb4648f25706.1474925354.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-12checkpatch: improve MACRO_ARG_PRECEDENCE testJoe Perches1-1/+19
It is possible for a multiple line macro definition to have a false positive report when an argument is used on a line after a continuation \. This line might have a leading '+' as the initial character that could be confused by checkpatch as an operator. Avoid the leading character on multiple line macro definitions. Link: http://lkml.kernel.org/r/60229d13399f9b6509db5a32e30d4c16951a60cd.1473836073.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-12checkpatch: add --strict test for precedence challenged macro argumentsJoe Perches1-1/+8
Add a test for macro arguents that have a non-comma leading or trailing operator where the argument isn't parenthesized to avoid possible precedence issues. Link: http://lkml.kernel.org/r/47715508972f8d786f435e583ff881dbeee3a114.1473745855.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Cc: Andy Whitcroft <apw@canonical.com> Cc: Julia Lawall <julia.lawall@lip6.fr> Cc: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-12checkpatch: add --strict test for macro argument reuseJoe Perches1-8/+35
If a macro argument is used multiple times in the macro definition, the macro argument may have an unexpected side-effect. Add a test (MACRO_ARG_REUSE) for that condition which is only emitted with command-line option --strict. Link: http://lkml.kernel.org/r/b6d67a87cafcafd15499e91780dc63b15dec0aa0.1473744906.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Cc: Andy Whitcroft <apw@canonical.com> Cc: Julia Lawall <julia.lawall@lip6.fr> Cc: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-12checkpatch: improve the block comment * alignment testJoe Perches1-7/+12
An "uninitialized value" is emitted when a block comment starts on the same line as a statement. Fix this and make the test use a little fewer cpu cycles too. Link: http://lkml.kernel.org/r/3c9993320c2182d37f53ac540878cfef59c3f62d.1473365956.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Reported-by: Charlemagne Lasse <charlemagnelasse@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-12checkpatch: speed up checking for filenames in sections marked obsoleteJoe Perches1-1/+1
Adding -f to the get_maintainer.pl invocation means git isn't invoked by get_maintainer.pl for known filenames. This reduces the overall time to run checkpatch. Link: http://lkml.kernel.org/r/22991e3a295aeb399b43af0478b6e5809106ccee.1472684066.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-12const_structs.checkpatch: add frequently used from Julia Lawall's listJoe Perches1-0/+25
Using const is generally a good idea. Julia Lawall has created a list of always const and almost always const structs in the kernel sources. Link: https://lkml.org/lkml/2016/8/28/95 Add the most frequently used (> 50 cases) that are almost always or always const. Link: http://lkml.kernel.org/r/1e16020f8027654db0095bbfbcc11da51025365c.1472664220.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Kees Cook <keescook@chromium.org> Cc: Julia Lawall <julia.lawall@lip6.fr> Cc: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-12checkpatch: externalize the structs that should be constJoe Perches2-40/+63
Make it easier to add new structs that should be const. Link: http://lkml.kernel.org/r/e5a8da43e7c11525bafbda1ca69a8323614dd942.1472664220.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Cc: Julia Lawall <julia.lawall@lip6.fr> Cc: Kees Cook <keescook@chromium.org> Cc: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-12checkpatch: don't test for prefer ether_addr_<foo>Joe Perches1-35/+35
< sigh > Comment these tests out. These are just too enticing to people that don't verify that both source and dest addresses really must be __aligned(2). It helps make Dan Carpenter happy too. Link: http://lkml.kernel.org/r/dc32ec66d24647f4cdf824c8dfbbc59aa7ce7b7d.1472665676.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: Greg <gvrose8192@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-12checkpatch: test multiple line block comment alignmentJoe Perches1-0/+19
Warn when block comments are not aligned on the * /* * block comment, no warning */ /* * block comment, emit warning */ Link: http://lkml.kernel.org/r/edb57bd330adfe024b95ec2a807d4aa7f0c8b112.1472261299.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Reported-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-12checkpatch: look for symbolic permissions and suggest octal insteadJoe Perches1-6/+43
S_<FOO> uses should be avoided where octal is more intelligible. Linus didst say: : It's *much* easier to parse and understand the octal numbers, while the : symbolic macro names are just random line noise and hard as hell to : understand. You really have to think about it. : : So we should rather go the other way: convert existing bad symbolic : permission bit macro use to just use the octal numbers. : : The symbolic names are good for the *other* bits (ie sticky bit, and the : inode mode _type_ numbers etc), but for the permission bits, the symbolic : names are just insane crap. Nobody sane should ever use them. Not in the : kernel, not in user space. (http://lkml.kernel.org/r/CA+55aFw5v23T-zvDZp-MmD_EYxF8WbafwwB59934FV7g21uMGQ@mail.gmail.com) Link: http://lkml.kernel.org/r/7232ef011d05a92f4caa86a5e9830d87966a2eaf.1470180926.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-12checkpatch: see if modified files are marked obsolete in MAINTAINERSJoe Perches1-0/+14
Use get_maintainer to check the status of individual files. If "obsolete", suggest leaving the files alone. Link: http://lkml.kernel.org/r/7ceaa510dc9d2df05ec4b456baed7bb1415550b3.1471889575.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Cc: SF Markus Elfring <elfring@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-11Coccinelle: flag conditions with no effectNicholas Mc Guire1-0/+64
Report code constructs where the if and else branch are functionally identical. In cases where this is intended it really should be documented - most reported cases probably are bugs. Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org> Signed-off-by: Michal Marek <mmarek@suse.com>
2016-10-11scripts/coccicheck: Update reference for the corresponding documentationMarkus Elfring1-1/+1
Use the current name (in a comment at the beginning of this script) for the file which was converted to the documentation format "reStructuredText" in August 2016. Fixes: 4b9033a33494 ("docs: sphinxify coccinelle.txt and add it to dev-tools") Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Acked-by: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by: Michal Marek <mmarek@suse.com>
2016-10-11gcc-plugins: Add latent_entropy pluginEmese Revfy2-1/+648
This adds a new gcc plugin named "latent_entropy". It is designed to extract as much possible uncertainty from a running system at boot time as possible, hoping to capitalize on any possible variation in CPU operation (due to runtime data differences, hardware differences, SMP ordering, thermal timing variation, cache behavior, etc). At the very least, this plugin is a much more comprehensive example for how to manipulate kernel code using the gcc plugin internals. The need for very-early boot entropy tends to be very architecture or system design specific, so this plugin is more suited for those sorts of special cases. The existing kernel RNG already attempts to extract entropy from reliable runtime variation, but this plugin takes the idea to a logical extreme by permuting a global variable based on any variation in code execution (e.g. a different value (and permutation function) is used to permute the global based on loop count, case statement, if/then/else branching, etc). To do this, the plugin starts by inserting a local variable in every marked function. The plugin then adds logic so that the value of this variable is modified by randomly chosen operations (add, xor and rol) and random values (gcc generates separate static values for each location at compile time and also injects the stack pointer at runtime). The resulting value depends on the control flow path (e.g., loops and branches taken). Before the function returns, the plugin mixes this local variable into the latent_entropy global variable. The value of this global variable is added to the kernel entropy pool in do_one_initcall() and _do_fork(), though it does not credit any bytes of entropy to the pool; the contents of the global are just used to mix the pool. Additionally, the plugin can pre-initialize arrays with build-time random contents, so that two different kernel builds running on identical hardware will not have the same starting values. Signed-off-by: Emese Revfy <re.emese@gmail.com> [kees: expanded commit message and code comments] Signed-off-by: Kees Cook <keescook@chromium.org>
2016-10-08spelling.txt: "modeled" is spelt correctlyJoe Perches1-1/+0
No need to correct the correct. Link: http://lkml.kernel.org/r/1472490791.3425.38.camel@perches.com Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-08nmi_backtrace: generate one-line reports for idle cpusChris Metcalf3-1/+3
When doing an nmi backtrace of many cores, most of which are idle, the output is a little overwhelming and very uninformative. Suppress messages for cpus that are idling when they are interrupted and just emit one line, "NMI backtrace for N skipped: idling at pc 0xNNN". We do this by grouping all the cpuidle code together into a new .cpuidle.text section, and then checking the address of the interrupted PC to see if it lies within that section. This commit suitably tags x86 and tile idle routines, and only adds in the minimal framework for other architectures. Link: http://lkml.kernel.org/r/1472487169-14923-5-git-send-email-cmetcalf@mellanox.com Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Daniel Thompson <daniel.thompson@linaro.org> [arm] Tested-by: Petr Mladek <pmladek@suse.com> Cc: Aaron Tomlin <atomlin@redhat.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-06Merge tag 'trace-v4.9' of ↵Linus Torvalds1-0/+115
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing updates from Steven Rostedt: "This release cycle is rather small. Just a few fixes to tracing. The big change is the addition of the hwlat tracer. It not only detects SMIs, but also other latency that's caused by the hardware. I have detected some latency from large boxes having bus contention" * tag 'trace-v4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing: Call traceoff trigger after event is recorded ftrace/scripts: Add helper script to bisect function tracing problem functions tracing: Have max_latency be defined for HWLAT_TRACER as well tracing: Add NMI tracing in hwlat detector tracing: Have hwlat trace migrate across tracing_cpumask CPUs tracing: Add documentation for hwlat_detector tracer tracing: Added hardware latency tracer ftrace: Access ret_stack->subtime only in the function profiler function_graph: Handle TRACE_BPUTS in print_graph_comment tracing/uprobe: Drop isdigit() check in create_trace_uprobe
2016-10-05Merge branch 'for-linus' of ↵Linus Torvalds1-1/+4
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 updates from Martin Schwidefsky: "The new features and main improvements in this merge for v4.9 - Support for the UBSAN sanitizer - Set HAVE_EFFICIENT_UNALIGNED_ACCESS, it improves the code in some places - Improvements for the in-kernel fpu code, in particular the overhead for multiple consecutive in kernel fpu users is recuded - Add a SIMD implementation for the RAID6 gen and xor operations - Add RAID6 recovery based on the XC instruction - The PCI DMA flush logic has been improved to increase the speed of the map / unmap operations - The time synchronization code has seen some updates And bug fixes all over the place" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (48 commits) s390/con3270: fix insufficient space padding s390/con3270: fix use of uninitialised data MAINTAINERS: update DASD maintainer s390/cio: fix accidental interrupt enabling during resume s390/dasd: add missing \n to end of dev_err messages s390/config: Enable config options for Docker s390/dasd: make query host access interruptible s390/dasd: fix panic during offline processing s390/dasd: fix hanging offline processing s390/pci_dma: improve lazy flush for unmap s390/pci_dma: split dma_update_trans s390/pci_dma: improve map_sg s390/pci_dma: simplify dma address calculation s390/pci_dma: remove dma address range check iommu/s390: simplify registration of I/O address translation parameters s390: migrate exception table users off module.h and onto extable.h s390: export header for CLP ioctl s390/vmur: fix irq pointer dereference in int handler s390/dasd: add missing KOBJ_CHANGE event for unformatted devices s390: enable UBSAN ...
2016-10-04Merge tag 'docs-4.9' of git://git.lwn.net/linuxLinus Torvalds1-16/+32
Pull documentation updates from Jonathan Corbet: "This is the documentation update pull for the 4.9 merge window. The Sphinx transition is still creating a fair amount of work. Here we have a number of fixes and, importantly, a proper PDF output solution, thanks to Jani Nikula, Mauro Carvalho Chehab and Markus Heiser. I've started a couple of new books: a driver API book (based on the old device-drivers.tmpl) and a development tools book. Both are meant to show how we can integrate together our existing documentation into a more coherent and accessible whole. It involves moving some stuff around and formatting changes, but, I think, the results are worth it. The good news is that most of our existing Documentation/*.txt files are *almost* in RST format already; the amount of messing around required is minimal. And, of course, there's the usual set of updates, typo fixes, and more" * tag 'docs-4.9' of git://git.lwn.net/linux: (120 commits) URL changed for Linux Foundation TAB dax : Fix documentation with respect to struct pages iio: Documentation: Correct the path used to create triggers. docs: Remove space-before-label guidance from CodingStyle docs-rst: add inter-document cross references Documentation/email-clients.txt: convert it to ReST markup Documentation/kernel-docs.txt: reorder based on timestamp Documentation/kernel-docs.txt: Add dates for online docs Documentation/kernel-docs.txt: get rid of broken docs Documentation/kernel-docs.txt: move in-kernel docs Documentation/kernel-docs.txt: remove more legacy references Documentation/kernel-docs.txt: add two published books Documentation/kernel-docs.txt: sort books per publication date Documentation/kernel-docs.txt: adjust LDD references Documentation/kernel-docs.txt: some improvements on the ReST output Documentation/kernel-docs.txt: Consistent indenting: 4 spaces Documentation/kernel-docs.txt: Add 4 paper/book references Documentation/kernel-docs.txt: Improve layouting of book list Documentation/kernel-docs.txt: Remove offline or outdated entries docs: Clean up bare :: lines ...
2016-10-04Merge tag 'char-misc-4.9-rc1' of ↵Linus Torvalds2-346/+252
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc Pull char/misc driver updates from Greg KH: "Here's the "big" char and misc driver update for 4.9-rc1. Lots of little things here, all over the driver tree for subsystems that flow through me. Nothing major that I can discern, full details are in the shortlog. All have been in the linux-next tree with no reported issues" * tag 'char-misc-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (144 commits) drivers/misc/hpilo: Changes to support new security states in iLO5 FW at25: fix debug and error messaging misc/genwqe: ensure zero initialization vme: fake: remove unexpected unlock in fake_master_set() vme: fake: mark symbols static where possible spmi: pmic-arb: Return an error code if sanity check fails Drivers: hv: get rid of id in struct vmbus_channel Drivers: hv: make VMBus bus ids persistent mcb: Add a dma_device to mcb_device mcb: Enable PCI bus mastering by default mei: stop the stall timer worker if not needed clk: probe common clock drivers earlier vme: fake: fix build for 64-bit dma_addr_t ttyprintk: Neaten and simplify printing mei: me: add kaby point device ids coresight: tmc: mark symbols static where possible coresight: perf: deal with error condition properly Drivers: hv: hv_util: Avoid dynamic allocation in time synch fpga manager: Add hardware dependency to Zynq driver Drivers: hv: utils: Support TimeSync version 4.0 protocol samples. ...
2016-10-02Coccinelle: pm_runtime: ensure relevance of pm_runtime reportsJulia Lawall1-7/+11
pm_runtime.cocci starts with one rule that searches for a variety of functions calls, followed by various rules that report errors. Previously, the only connection between the first rule and the rest was to check that the first rule had matched somewhere. Change the rules to propagate a position from the first rule to the others, to make sure that the sites reported on are the same as the sites that were identified as having the relevant functions. Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Michal Marek <mmarek@suse.com>
2016-10-02Coccinelle: limit memdup_user transformation to GFP_KERNEL caseJulia Lawall1-4/+4
Memdup_user encapsulates a memory allocation with the flag GFP_KERNEL, so only allow this flag in the original code. Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Michal Marek <mmarek@suse.com>
2016-09-29scripts/recordmcount.c: account for .softirqentry.textDmitry Vyukov2-0/+2
be7635e7287e ("arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections") added .softirqentry.text section, but it was not added to recordmcount. So functions in the section are untracable. Add the section to scripts/recordmcount.c and scripts/recordmcount.pl. Fixes: be7635e7287e ("arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections") Link: http://lkml.kernel.org/r/1474902626-73468-1-git-send-email-dvyukov@google.com Signed-off-by: Dmitry Vyukov <dvyukov@google.com> Acked-by: Steve Rostedt <rostedt@goodmis.org> Cc: <stable@vger.kernel.org> [4.6+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-09-23initramfs: Escape colons in depfileMichal Marek1-1/+4
Special characters are problematic in depfiles, but we can fix colons easily. Reported-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Michal Marek <mmarek@suse.com>
2016-09-21ftrace/scripts: Add helper script to bisect function tracing problem functionsSteven Rostedt (Red Hat)1-0/+115
Every so often, with a special config or a architecture change, running function or function_graph tracing can cause the machien to hard reboot, crash, or simply hard lockup. There's some functions in the function graph tracer that can not be traced otherwise it causes the function tracer to recurse before the recursion protection mechanisms are in place. When this occurs, using the dynamic ftrace featuer that allows limiting what actually gets traced can be used to bisect down to the problem function. This adds a script that helps with this process in the scripts/tracing directory, called ftrace-bisect.sh The set up is to read all the functions that can be traced from available_filter_functions into a file (full_file). Then run this script passing it the full_file and a "test_file" and "non_test_file", where the test_file will be add to set_ftrace_filter. What ftarce_bisect.sh does, is to copy half of the functions in full_file into the test_file and the other half into the non_test_file. This way, one can cat the test_file into the set_ftrace_filter functions and only test the functions that are in that file. If it works, then we run the process again after copying non_test_file to full_file and repeating the process. If the system crashed, then the bad function is in the test_file and after a reboot, the test_file becomes the new full_file in the next iteration. When we get down to a single function in the full_file, then ftrace_bisect.sh will report that as the bad function. Full documentation of how to use this simple script is within the script file itself. Link: http://lkml.kernel.org/r/20160920100716.131d3647@gandalf.local.home Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2016-09-20ubsan: allow to disable the null sanitizerChristian Borntraeger1-1/+4
Some architectures use a hardware defined structure at address zero. Checking for a null pointer will result in many ubsan reports. Allow users to disable the null sanitizer. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-09-20scripts/faddr2line: improve on base path filtering a bitLinus Torvalds1-1/+1
Due to our compiler include directives, the build pathnames for header files often end up being of the form "$srcdir/./include/linux/xyz.h", which ends up having that extra "." path component after the build base in it. Teach faddr2line to skip that too, to make code generated in inline functions in header files match the filename for the regular C files. Rabin Vincent pointed out that I can't make a stricter regexp match by using the " at " prefix for the pathname, because that ends up being locale-dependent. But this does require that the path match be preceded by a space, to make it a bit more strict (that matters mainly if we didn't find any base_dir at all, and we only end up with the "./" part of the match) Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Rabin Vincent <rabin@rab.in> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-09-19scripts: add script for translating stack dump function offsetsJosh Poimboeuf1-0/+177
addr2line doesn't work with KASLR addresses. Add a basic addr2line wrapper script which takes the 'func+offset/size' format as input. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-09-09kbuild: add arch specific post-link MakefileNicholas Piggin1-5/+9
Allow architectures to create arch/xxx/Makefile.postlink with targets for vmlinux, modules.ko, and clean, which will be invoked after final linking of vmlinux and modules. powerpc will use this to check vmlinux linker relocations for sanity, and may use it to fix up alternate instruction patch branch addresses. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michal Marek <mmarek@suse.com>
2016-09-09kbuild: allow architectures to use thin archives instead of ld -rStephen Rothwell2-15/+79
ld -r is an incremental link used to create built-in.o files in build subdirectories. It produces relocatable object files containing all its input files, and these are are then pulled together and relocated in the final link. Aside from the bloat, this constrains the final link relocations, which has bitten large powerpc builds with unresolvable relocations in the final link. Alan Modra has recommended the kernel use thin archives for linking. This is an alternative and means that the linker has more information available to it when it links the kernel. This patch enables a config option architectures can select, which causes all built-in.o files to be built as thin archives. built-in.o files in subdirectories do not get symbol table or index attached, which improves speed and size. The final link pass creates a built-in.o archive in the root output directory which includes the symbol table and index. The linker then uses takes this file to link. The --whole-archive linker option is required, because the linker now has visibility to every individual object file, and it will otherwise just completely avoid including those without external references (consider a file with EXPORT_SYMBOL or initcall or hardware exceptions as its only entry points). The traditional built works "by luck" as built-in.o files are large enough that they're going to get external references. However this optimisation is unpredictable for the kernel (due to above external references), ineffective at culling unused, and costly because the .o files have to be searched for references. Superior alternatives for link-time culling should be used instead. Build characteristics for inclink vs thinarc, on a small powerpc64le pseries VM with a modest .config: inclink thinarc sizes vmlinux 15 618 680 15 625 028 sum of all built-in.o 56 091 808 1 054 334 sum excluding root built-in.o 151 430 find -name built-in.o | xargs rm ; time make vmlinux real 22.772s 21.143s user 13.280s 13.430s sys 4.310s 2.750s - Final kernel pulled in only about 6K more, which shows how ineffective the object file culling is. - Build performance looks improved due to less pagecache activity. On IO constrained systems it could be a bigger win. - Build size saving is significant. Side note, the toochain understands archives, so there's some tricks, $ ar t built-in.o # list all files you linked with $ size built-in.o # and their sizes $ objdump -d built-in.o # disassembly (unrelocated) with filenames Implementation by sfr, minor tweaks by npiggin. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michal Marek <mmarek@suse.com>
2016-09-06docs: Special-case function-pointer parameters in kernel-docJonathan Corbet1-0/+2
Add yet another regex to kernel-doc to trap @param() references separately and not produce corrupt RST markup. Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2016-09-06docs: make kernel-doc handle varargs properlyJonathan Corbet1-1/+2
As far as I can tell, the handling of "..." arguments has never worked right, so any documentation provided was ignored in favor of "variable arguments." This makes kernel-doc handle "@...:" as documented. It does *not* fix spots in kerneldoc comments that don't follow that convention, but they are no more broken than before. Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2016-09-05Merge branch 'rc-fixes' of ↵Linus Torvalds1-1/+3
git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild Pull kbuild fix from Michal Marek: "Fix for 'make deb-pkg'. The bug got introduced in v4.8-rc1" * 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: builddeb: Skip gcc-plugins when not configured
2016-09-05Merge 4.8-rc5 into char-misc-nextGreg Kroah-Hartman3-11/+3
We want the fixes in here for merging and testing. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-09-02treewide: remove references to the now unnecessary DEFINE_PCI_DEVICE_TABLEJoe Perches2-10/+0
It's been eliminated from the sources, remove it from everywhere else. Link: http://lkml.kernel.org/r/076eff466fd7edb550c25c8b25d76924ca0eba62.1472660229.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Andy Whitcroft <apw@canonical.com> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-09-01docs-rst: kernel-doc: fix typedef output in RST formatMauro Carvalho Chehab1-10/+24
When using a typedef function like this one: typedef bool v4l2_check_dv_timings_fnc (const struct v4l2_dv_timings * t, void * handle); The Sphinx C domain expects it to create a c:type: reference, as that's the way it creates the type references when parsing a c:function:: declaration. So, a declaration like: .. c:function:: bool v4l2_valid_dv_timings (const struct v4l2_dv_timings * t, const struct v4l2_dv_timings_cap * cap, v4l2_check_dv_timings_fnc fnc, void * fnc_handle) Will create a cross reference for :c:type:`v4l2_check_dv_timings_fnc`. So, when outputting such typedefs in RST format, we need to handle this special case, as otherwise it will produce those warnings: ./include/media/v4l2-dv-timings.h:43: WARNING: c:type reference target not found: v4l2_check_dv_timings_fnc ./include/media/v4l2-dv-timings.h:60: WARNING: c:type reference target not found: v4l2_check_dv_timings_fnc ./include/media/v4l2-dv-timings.h:81: WARNING: c:type reference target not found: v4l2_check_dv_timings_fnc So, change the kernel-doc script to produce a RST output for the above typedef as: .. c:type:: v4l2_check_dv_timings_fnc **Typedef**: timings check callback **Syntax** ``bool v4l2_check_dv_timings_fnc (const struct v4l2_dv_timings * t, void * handle);`` Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2016-09-01docs-rst: improve typedef parserMauro Carvalho Chehab1-1/+3
Improve the parser to handle typedefs like: typedef bool v4l2_check_dv_timings_fnc(const struct v4l2_dv_timings *t, void *handle); Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2016-08-31ver_linux: rename ver_linux.awk to ver_linuxAlexander Kapshuk1-0/+0
ver_linux.awk renamed to ver_linux. Signed-off-by: Alexander Kapshuk <alexander.kapshuk@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-08-31ver_linux: shell implementation removedAlexander Kapshuk1-193/+0
The shell implementation removed. To be replaced with an all-awk implementation via consecutive patch. Signed-off-by: Alexander Kapshuk <alexander.kapshuk@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-08-31ver_linux: complete awk implementationAlexander Kapshuk1-0/+89
The algorithm that extracts the version number of the utility being queried, and prints the name of the utility and its version number is currently implemented in awk. The code is used throughout the script, making its use repetative. The proposed implementation confines the algorithm in question to a function, which makes the script easier to read overall, as well as considerably reduces the number of lines of code. Every attempt has been made to retain the look and the format generated by the current implementation. Signed-off-by: Alexander Kapshuk <alexander.kapshuk@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-08-28checkkconfigsymbols: use arglist instead of cmd stringValentin Rothberg1-11/+16
Splitting a command string could lead to unintended arguments. Use an argument list in the execute() function instead. Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-08-28checkkconfigsymblos: consistent symbol terminologyValentin Rothberg1-67/+67
'symbol' and 'feature' are used synonymously to refer to Kconfig symbols (configs, menus, etc.). Use the term 'symbol' to have a consistent terminology and to make the code more comprehensible. Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-08-28checkkconfigsymbols.py: fix pylint and pep8 warningsValentin Rothberg1-10/+8
Fix pylint and pep8 warnings to have a consistent syntax and style. Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-08-28checkkconfigsymbols: use ArgumentParserValentin Rothberg1-73/+69
Replace the deprecated OptionParser with ArgumentParser, as recommended by pylint. Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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