kernel/linux.git/tools/objtool/Makefile, branch v4.9.136

Kbuild: fix # escaping in .cmd files for future Make

2018-07-11T14:26:45+00:00

commit 9564a8cf422d7b58f6e857e3546d346fa970191e upstream. I tried building using a freshly built Make (4.2.1-69-g8a731d1), but already the objtool build broke with orc_dump.c: In function ‘orc_dump’: orc_dump.c:106:2: error: ‘elf_getshnum’ is deprecated [-Werror=deprecated-declarations] if (elf_getshdrnum(elf, &nr_sections)) { Turns out that with that new Make, the backslash was not removed, so cpp didn't see a #include directive, grep found nothing, and -DLIBELF_USE_DEPRECATED was wrongly put in CFLAGS. Now, that new Make behaviour is documented in their NEWS file: * WARNING: Backward-incompatibility! Number signs (#) appearing inside a macro reference or function invocation no longer introduce comments and should not be escaped with backslashes: thus a call such as: foo := $(shell echo '#') is legal. Previously the number sign needed to be escaped, for example: foo := $(shell echo '\#') Now this latter will resolve to "\#". If you want to write makefiles portable to both versions, assign the number sign to a variable: C := \# foo := $(shell echo '$C') This was claimed to be fixed in 3.81, but wasn't, for some reason. To detect this change search for 'nocomment' in the .FEATURES variable. This also fixes up the two make-cmd instances to replace # with $(pound) rather than with \#. There might very well be other places that need similar fixup in preparation for whatever future Make release contains the above change, but at least this builds an x86_64 defconfig with the new make. Link: https://bugzilla.kernel.org/show_bug.cgi?id=197847 Cc: Randy Dunlap Signed-off-by: Rasmus Villemoes Signed-off-by: Masahiro Yamada Signed-off-by: Greg Kroah-Hartman

objtool: sync up with the 4.14.47 version of objtool

2018-06-05T08:28:57+00:00

There are pros and cons of dealing with tools in the kernel directory. The pros are the fact that development happens fast, and new features can be added to the kernel and the tools at the same times. The cons are when dealing with backported kernel patches, it can be necessary to backport parts of the tool changes as well. For 4.9.y so far, we have backported individual patches. That quickly breaks down when there are minor differences between how backports were handled, so grabbing 40+ patch long series can be difficult, not impossible, but really frustrating to attempt. To help mitigate this mess, here's a single big patch to sync up the objtool logic to the 4.14.47 version of the tool. From this point forward (after some other minor header file patches are applied), the tool should be in sync and much easier to maintain over time. This has survivied my limited testing, and as the codebase is identical to 4.14.47, I'm pretty comfortable dropping this big change in here in 4.9.y. Hopefully all goes well... Cc: Josh Poimboeuf Signed-off-by: Greg Kroah-Hartman

objtool: Un-capitalize "Warning" for out-of-sync instruction decoder

2016-07-29T14:57:16+00:00

Change "Warning" to "warning" to make it look more like a GCC warning. Hopefully that will be enough to help the 0-day bot or other automated tools catch this warning earlier before it ends up in Linus's tree. Reported-by: Linus Torvalds Signed-off-by: Josh Poimboeuf Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/b1669f391a5db91040427fd9f8e1e79db18f9709.1469751119.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar

tools build: Fix objtool build with ARCH=x86_64

2016-07-22T19:37:44+00:00

The objtool build fails in a cross-compiled environment on a non-x86 host with "ARCH=x86_64": tools/objtool/objtool-in.o: In function `decode_instructions': tools/objtool/builtin-check.c:276: undefined reference to `arch_decode_instruction' We could override the ARCH environment variable and change it back to x86, similar to what the objtool Makefile was doing before; but it's tricky to override environment variables consistently. Instead, take a similar approach used by the Linux top-level Makefile and introduce a SRCARCH Makefile variable which evaluates to "x86" when ARCH is either "x86_64" or "x86". Reported-by: Stephen Rothwell Signed-off-by: Josh Poimboeuf Cc: Andy Lutomirski Cc: H. Peter Anvin Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/20160722191920.ej62fnspnqurbaa7@treble Signed-off-by: Arnaldo Carvalho de Melo

objtool: Always use host headers

2016-07-22T19:28:46+00:00

From a conversation with Josh: From http://lkml.kernel.org/r/20160722034118.guckaniobf3f7czc@treble : It needs to be compiled with the host (powerpc) compiler, but then it needs to disassemble target (x86) files. ---- So use HOSTARCH instead of ARCH. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Josh Poimboeuf Cc: Namhyung Kim Cc: Stephen Rothwell Cc: Wang Nan Link: http://lkml.kernel.org/r/20160722034118.guckaniobf3f7czc@treble Link: http://lkml.kernel.org/n/tip-le1m1yzxnfpt3msbblu40nm8@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

objtool: Use tools/scripts/Makefile.arch to get ARCH and HOSTARCH

2016-07-22T19:28:25+00:00

objtool's Makefile was setting up ARCH but fixing up just the x86_64 -> x86, using Makefile.arch will do the necessary fixups for all arches. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Josh Poimboeuf Cc: Namhyung Kim Cc: Stephen Rothwell Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-hbq0bbh03u2b722vozcyql31@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

objtool: Add -I$(srctree)/tools/arch/$(ARCH)/include/uapi

2016-07-15T20:29:20+00:00

So that it can find asm/bitsperlong.h to get the __BITS_PER_LONG definition. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Josh Poimboeuf Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-pr3pvskh65pey4po7t122z4j@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

objtool: Avoid checking code drift on busybox's diff

2016-07-14T02:08:54+00:00

That doesn't have -I to match lines. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Josh Poimboeuf Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-1zqv1h6okt70e2huokkdtf1u@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

objtool: Allow building with older libelf

2016-05-17T08:42:46+00:00

The switch to elf_getshdr{num,strndx} post-dates the oldest tool chain the kernel is supposed to be able to build with, so try to cope with such an environment. Signed-off-by: Jan Beulich Signed-off-by: Josh Poimboeuf Cc: # for v4.6 Cc: Alexander Shishkin Cc: Arnaldo Carvalho de Melo Cc: Jan Beulich Cc: Jiri Olsa Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Gleixner Cc: Vince Weaver Link: http://lkml.kernel.org/r/732dae6872b7ff187d94f22bb699a12849d3fe04.1463430618.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar

objtool: Compile with debugging symbols

2016-03-09T09:48:08+00:00

Compile objtool with debugging symbols ('-g') to help tools like perf and gdb understand what it's doing. Combined with '-O2', it's not always helpful, but it's better than nothing. Reported-by: Ingo Molnar Signed-off-by: Josh Poimboeuf Cc: Andrew Morton Cc: Andy Lutomirski Cc: Arnaldo Carvalho de Melo Cc: Arnaldo Carvalho de Melo Cc: Bernd Petrovitsch Cc: Borislav Petkov Cc: Chris J Arges Cc: Jiri Slaby Cc: Linus Torvalds Cc: Michal Marek Cc: Namhyung Kim Cc: Pedro Alves Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: live-patching@vger.kernel.org Link: http://lkml.kernel.org/r/c295e9ee9ed360dc8b2e1d180c859f11cfc151ef.1457502970.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar