kernel/linux.git/arch/ia64/include/uapi, branch v6.6.131

arch/ia64/include: remove CONFIG_IA64_DEBUG_CMPXCHG from uapi header

2023-08-18T17:18:50+00:00

CONFIG_* switches should not be exposed in uapi headers. The macros that are defined here are also only useful for the kernel code, so let's move them to asm/cmpxchg.h instead. The only two files that are using these macros are the headers arch/ia64/include/asm/bitops.h and arch/ia64/include/asm/atomic.h and these include asm/cmpxchg.h via asm/intrinsics.h, so this movement should not cause any trouble. Link: https://lkml.kernel.org/r/20230426065032.517693-1-thuth@redhat.com Signed-off-by: Thomas Huth Cc: Arnd Bergmann Signed-off-by: Andrew Morton

locking/arch: Rename all internal xchg() names to arch_xchg()

2023-04-29T07:08:44+00:00

Decrease the probability of this internal facility to be used by driver code. Signed-off-by: Andrzej Hajda Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Reviewed-by: Arnd Bergmann Reviewed-by: Andi Shyti Acked-by: Geert Uytterhoeven [m68k] Acked-by: Palmer Dabbelt [riscv] Link: https://lore.kernel.org/r/20230118154450.73842-1-andrzej.hajda@intel.com Cc: Linus Torvalds

Remove Intel compiler support

2023-03-05T18:49:37+00:00

include/linux/compiler-intel.h had no update in the past 3 years. We often forget about the third C compiler to build the kernel. For example, commit a0a12c3ed057 ("asm goto: eradicate CC_HAS_ASM_GOTO") only mentioned GCC and Clang. init/Kconfig defines CC_IS_GCC and CC_IS_CLANG but not CC_IS_ICC, and nobody has reported any issue. I guess the Intel Compiler support is broken, and nobody is caring about it. Harald Arnesen pointed out ICC (classic Intel C/C++ compiler) is deprecated: $ icc -v icc: remark #10441: The Intel(R) C++ Compiler Classic (ICC) is deprecated and will be removed from product release in the second half of 2023. The Intel(R) oneAPI DPC++/C++ Compiler (ICX) is the recommended compiler moving forward. Please transition to use this compiler. Use '-diag-disable=10441' to disable this message. icc version 2021.7.0 (gcc version 12.1.0 compatibility) Arnd Bergmann provided a link to the article, "Intel C/C++ compilers complete adoption of LLVM". lib/zstd/common/compiler.h and lib/zstd/compress/zstd_fast.c were kept untouched for better sync with https://github.com/facebook/zstd Link: https://www.intel.com/content/www/us/en/developer/articles/technical/adoption-of-llvm-complete-icx.html Signed-off-by: Masahiro Yamada Acked-by: Arnd Bergmann Reviewed-by: Nick Desaulniers Reviewed-by: Nathan Chancellor Reviewed-by: Miguel Ojeda Signed-off-by: Linus Torvalds

termios: kill uapi termios.h that are identical to generic one

2022-09-09T08:44:35+00:00

mandatory-y will have the generic picked for architectures that don't have uapi/asm/termios.h of their own. ia64, parisc and s390 ones are identical to generic, so... Signed-off-by: Al Viro Link: https://lore.kernel.org/r/YxGVXpS2dWoTwoa0@ZenIV Signed-off-by: Greg Kroah-Hartman

ia64: fix sparse warnings with cmpxchg() & xchg()

2022-06-17T02:58:20+00:00

On IA64, new sparse's warnings where issued after fixing some __rcu annotations in kernel/bpf/. These new warnings are false positives and appear on IA64 because on this architecture, the macros for cmpxchg() and xchg() make casts that ignore sparse annotations. This patch contains the minimal patch to fix this issue: adding a missing cast and some missing '__force'. Link: https://lore.kernel.org/r/20220601120013.bq5a3ynbkc3hngm5@mail Link: https://lkml.kernel.org/r/20220605160738.79736-1-luc.vanoostenryck@gmail.com Signed-off-by: Luc Van Oostenryck Reported-by: kernel test robot Acked-by: Paul E. McKenney Acked-by: Toke Høiland-Jørgensen Cc: Arnd Bergmann Signed-off-by: Andrew Morton

Merge tag 'tty-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

2022-03-28T20:00:51+00:00

Pull tty/serial driver updates from Greg KH: "Here are the big set of tty and serial driver changes for 5.18-rc1. Nothing major, some more good cleanups from Jiri and 2 new serial drivers. Highlights include: - termbits cleanups - export symbol cleanups and other core cleanups from Jiri Slaby - new sunplus and mvebu uart drivers (amazing that people are still creating new uarts...) - samsung serial driver cleanups - ldisc 29 is now "reserved" for experimental/development line disciplines - lots of other tiny fixes and cleanups to serial drivers and bindings All of these have been in linux-next for a while with no reported issues" * tag 'tty-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (104 commits) vt_ioctl: fix potential spectre v1 in VT_DISALLOCATE serial: 8250: fix XOFF/XON sending when DMA is used tty: serial: samsung: Add ARTPEC-8 support dt-bindings: serial: samsung: Add ARTPEC-8 UART serial: sc16is7xx: Clear RS485 bits in the shutdown tty: serial: samsung: simplify getting OF match data tty: serial: samsung: constify variables and pointers tty: serial: samsung: constify s3c24xx_serial_drv_data members tty: serial: samsung: constify UART name tty: serial: samsung: constify s3c24xx_serial_drv_data tty: serial: samsung: reduce number of casts tty: serial: samsung: embed s3c2410_uartcfg in parent structure tty: serial: samsung: embed s3c24xx_uart_info in parent structure serial: 8250_tegra: mark acpi_device_id as unused with !ACPI tty: serial: bcm63xx: use more precise Kconfig symbol serial: SERIAL_SUNPLUS should depend on ARCH_SUNPLUS tty: serial: jsm: fix two assignments in if conditions tty: serial: jsm: remove redundant assignments to variable linestatus serial: 8250_mtk: make two read-only arrays static const serial: samsung_tty: do not unlock port->lock for uart_write_wakeup() ...

ia64: termbits.h is identical to asm-generic one

2022-02-25T09:20:37+00:00

Remove arch specific termbits.h as there are only trivial space differences between include/uapi/asm-generic/termbits.h and arch/ia64/include/uapi/asm/termbits.h: $ diff -u0 -b -B include/uapi/asm-generic/termbits.h arch/ia64/include/uapi/asm/termbits.h . --- include/uapi/asm-generic/termbits.h 2022-01-10 13:44:42.814107461 +0200 . +++ arch/ia64/include/uapi/asm/termbits.h 2022-01-10 13:44:42.678106874 +0200 . @@ -2,2 +2,11 @@ . -#ifndef __ASM_GENERIC_TERMBITS_H . -#define __ASM_GENERIC_TERMBITS_H . +#ifndef _ASM_IA64_TERMBITS_H . +#define _ASM_IA64_TERMBITS_H . + . +/* . + * Based on . . + * . + * Modified 1999 . + * David Mosberger-Tang , Hewlett-Packard Co . + * . + * 99/01/28 Added new baudrates . + */ . @@ -200 +209 @@ . -#endif /* __ASM_GENERIC_TERMBITS_H */ . +#endif /* _ASM_IA64_TERMBITS_H */ Reviewed-by: Andy Shevchenko Signed-off-by: Ilpo Järvinen Link: https://lore.kernel.org/r/20220222115604.7351-2-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman

signal.h: add linux/signal.h and asm/signal.h to UAPI compile-test coverage

2022-02-17T08:09:36+00:00

linux/signal.h and asm/signal.h are currently excluded from the UAPI compile-test because of the errors like follows: HDRTEST usr/include/asm/signal.h In file included from : ./usr/include/asm/signal.h:103:9: error: unknown type name ‘size_t’ 103 | size_t ss_size; | ^~~~~~ The errors can be fixed by replacing size_t with __kernel_size_t. Then, remove the no-header-test entries from user/include/Makefile. Signed-off-by: Masahiro Yamada Reviewed-by: Arnd Bergmann Reviewed-by: Geert Uytterhoeven Acked-by: Geert Uytterhoeven Signed-off-by: Arnd Bergmann

printk: Userspace format indexing support

2021-07-19T09:57:48+00:00

We have a number of systems industry-wide that have a subset of their functionality that works as follows: 1. Receive a message from local kmsg, serial console, or netconsole; 2. Apply a set of rules to classify the message; 3. Do something based on this classification (like scheduling a remediation for the machine), rinse, and repeat. As a couple of examples of places we have this implemented just inside Facebook, although this isn't a Facebook-specific problem, we have this inside our netconsole processing (for alarm classification), and as part of our machine health checking. We use these messages to determine fairly important metrics around production health, and it's important that we get them right. While for some kinds of issues we have counters, tracepoints, or metrics with a stable interface which can reliably indicate the issue, in order to react to production issues quickly we need to work with the interface which most kernel developers naturally use when developing: printk. Most production issues come from unexpected phenomena, and as such usually the code in question doesn't have easily usable tracepoints or other counters available for the specific problem being mitigated. We have a number of lines of monitoring defence against problems in production (host metrics, process metrics, service metrics, etc), and where it's not feasible to reliably monitor at another level, this kind of pragmatic netconsole monitoring is essential. As one would expect, monitoring using printk is rather brittle for a number of reasons -- most notably that the message might disappear entirely in a new version of the kernel, or that the message may change in some way that the regex or other classification methods start to silently fail. One factor that makes this even harder is that, under normal operation, many of these messages are never expected to be hit. For example, there may be a rare hardware bug which one wants to detect if it was to ever happen again, but its recurrence is not likely or anticipated. This precludes using something like checking whether the printk in question was printed somewhere fleetwide recently to determine whether the message in question is still present or not, since we don't anticipate that it should be printed anywhere, but still need to monitor for its future presence in the long-term. This class of issue has happened on a number of occasions, causing unhealthy machines with hardware issues to remain in production for longer than ideal. As a recent example, some monitoring around blk_update_request fell out of date and caused semi-broken machines to remain in production for longer than would be desirable. Searching through the codebase to find the message is also extremely fragile, because many of the messages are further constructed beyond their callsite (eg. btrfs_printk and other module-specific wrappers, each with their own functionality). Even if they aren't, guessing the format and formulation of the underlying message based on the aesthetics of the message emitted is not a recipe for success at scale, and our previous issues with fleetwide machine health checking demonstrate as much. This provides a solution to the issue of silently changed or deleted printks: we record pointers to all printk format strings known at compile time into a new .printk_index section, both in vmlinux and modules. At runtime, this can then be iterated by looking at /printk/index/, which emits the following format, both readable by humans and able to be parsed by machines: $ head -1 vmlinux; shuf -n 5 vmlinux # filename:line function "format" <5> block/blk-settings.c:661 disk_stack_limits "%s: Warning: Device %s is misaligned\n" <4> kernel/trace/trace.c:8296 trace_create_file "Could not create tracefs '%s' entry\n" <6> arch/x86/kernel/hpet.c:144 _hpet_print_config "hpet: %s(%d):\n" <6> init/do_mounts.c:605 prepare_namespace "Waiting for root device %s...\n" <6> drivers/acpi/osl.c:1410 acpi_no_auto_serialize_setup "ACPI: auto-serialization disabled\n" This mitigates the majority of cases where we have a highly-specific printk which we want to match on, as we can now enumerate and check whether the format changed or the printk callsite disappeared entirely in userspace. This allows us to catch changes to printks we monitor earlier and decide what to do about it before it becomes problematic. There is no additional runtime cost for printk callers or printk itself, and the assembly generated is exactly the same. Signed-off-by: Chris Down Cc: Petr Mladek Cc: Jessica Yu Cc: Sergey Senozhatsky Cc: John Ogness Cc: Steven Rostedt Cc: Greg Kroah-Hartman Cc: Johannes Weiner Cc: Kees Cook Reviewed-by: Petr Mladek Tested-by: Petr Mladek Reported-by: kernel test robot Acked-by: Andy Shevchenko Acked-by: Jessica Yu # for module.{c,h} Signed-off-by: Petr Mladek Link: https://lore.kernel.org/r/e42070983637ac5e384f17fbdbe86d19c7b212a5.1623775748.git.chris@chrisdown.name

locking/atomic: ia64: move to ARCH_ATOMIC

2021-05-26T11:20:51+00:00

We'd like all architectures to convert to ARCH_ATOMIC, as once all architectures are converted it will be possible to make significant cleanups to the atomics headers, and this will make it much easier to generically enable atomic functionality (e.g. debug logic in the instrumented wrappers). As a step towards that, this patch migrates ia64 to ARCH_ATOMIC. The arch code provides arch_{atomic,atomic64,xchg,cmpxchg}*(), and common code wraps these with optional instrumentation to provide the regular functions. Signed-off-by: Mark Rutland Cc: Boqun Feng Cc: Peter Zijlstra Cc: Will Deacon Signed-off-by: Peter Zijlstra (Intel) Link: https://lore.kernel.org/r/20210525140232.53872-20-mark.rutland@arm.com