The patch titled
Subject: compiler.h: avoid escaped section names
has been added to the -mm tree. Its filename is
compilerh-avoid-escaped-section-names.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/compilerh-avoid-escaped-section-names.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/compilerh-avoid-escaped-section-names.patch
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------------------------------------------------------
From: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Subject: compiler.h: avoid escaped section names
The stringification operator, `#`, in the preprocessor escapes strings.
For example, `# "foo"` becomes `"\"foo\""`. GCC and Clang differ in how
they treat section names that contain \".
The portable solution is to not use a string literal with the preprocessor
stringification operator.
In this case, since __section unconditionally uses the stringification
operator, we actually want the more verbose
__attribute__((__section__())).
Link: https://bugs.llvm.org/show_bug.cgi?id=42950
Link: https://lkml.kernel.org/r/20200929194318.548707-1-ndesaulniers@xxxxxxxxxx
Fixes: commit e04462fb82f8 ("Compiler Attributes: remove uses of __attribute__ from compiler.h")
Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
Cc: Nathan Chancellor <natechancellor@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/compiler.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/compiler.h~compilerh-avoid-escaped-section-names
+++ a/include/linux/compiler.h
@@ -155,7 +155,7 @@ void ftrace_likely_update(struct ftrace_
extern typeof(sym) sym; \
static const unsigned long __kentry_##sym \
__used \
- __section("___kentry" "+" #sym ) \
+ __attribute__((__section__("___kentry+" #sym))) \
= (unsigned long)&sym;
#endif
_
Patches currently in -mm which might be from ndesaulniers@xxxxxxxxxx are
compiler-clang-add-build-check-for-clang-1001.patch
revert-kbuild-disable-clangs-default-use-of-fmerge-all-constants.patch
revert-arm64-bti-require-clang-=-1001-for-in-kernel-bti-support.patch
revert-arm64-vdso-fix-compilation-with-clang-older-than-8.patch
partially-revert-arm-8905-1-emit-__gnu_mcount_nc-when-using-clang-1000-or-newer.patch
compiler-gcc-improve-version-error.patch
compilerh-avoid-escaped-section-names.patch
