Arnd Bergmann a52a2817d2 objtool: add UACCESS exceptions for __tsan_volatile_read/write ... [ Upstream commit d5d4692472 ] A lot of the tsan helpers are already excempt from the UACCESS warnings, but some more functions were added that need the same thing: kernel/kcsan/core.o: warning: objtool: __tsan_volatile_read16+0x0: call to __tsan_unaligned_read16() with UACCESS enabled kernel/kcsan/core.o: warning: objtool: __tsan_volatile_write16+0x0: call to __tsan_unaligned_write16() with UACCESS enabled vmlinux.o: warning: objtool: __tsan_unaligned_volatile_read16+0x4: call to __tsan_unaligned_read16() with UACCESS enabled vmlinux.o: warning: objtool: __tsan_unaligned_volatile_write16+0x4: call to __tsan_unaligned_write16() with UACCESS enabled As Marco points out, these functions don't even call each other explicitly but instead gcc (but not clang) notices the functions being identical and turns one symbol into a direct branch to the other. Link: https://lkml.kernel.org/r/20230215130058.3836177-4-arnd@kernel.org Fixes: 75d75b7a4d ("kcsan: Support distinguishing volatile accesses") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Josh Poimboeuf <jpoimboe@kernel.org> Cc: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-03-10 09:33:28 +01:00
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Documentation	objtool: Update documentation	2022-04-22 12:32:05 +02:00
arch/x86	objtool,x86: Teach decode about LOOP* instructions	2022-09-15 16:13:55 +02:00
include/objtool	x86/retbleed: Add fine grained Kconfig knobs	2022-06-29 17:43:41 +02:00
.gitignore	…
Build	objtool: Ditch subcommands	2022-04-22 12:32:01 +02:00
Makefile	Kbuild updates for v5.19	2022-05-26 12:09:50 -07:00
builtin-check.c	x86/retbleed: Add fine grained Kconfig knobs	2022-06-29 17:43:41 +02:00
check.c	objtool: add UACCESS exceptions for __tsan_volatile_read/write	2023-03-10 09:33:28 +01:00
elf.c	objtool: Preserve special st_shndx indexes in elf_update_symbol	2022-09-26 10:13:15 -07:00
objtool.c	x86,objtool: Create .return_sites	2022-06-27 10:33:58 +02:00
orc_dump.c	…
orc_gen.c	Merge branch 'objtool/urgent'	2021-10-07 00:40:17 +02:00
special.c	objtool,x86: Replace alternatives with .retpoline_sites	2021-10-28 23:25:25 +02:00
sync-check.sh	Merge branch 'x86/cpu' into WIP.x86/core, to merge the NOP changes & resolve a semantic conflict	2021-04-02 12:36:30 +02:00
weak.c	objtool: Ditch subcommands	2022-04-22 12:32:01 +02:00