From: Nick Desaulniers <ndesaulniers@google.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
Nick Desaulniers <ndesaulniers@google.com>,
Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
Nathan Chancellor <natechancellor@gmail.com>,
linux-sparse@vger.kernel.org, linux-kernel@vger.kernel.org,
clang-built-linux@googlegroups.com
Subject: [PATCH] compiler.h: avoid escaped section names
Date: Tue, 29 Sep 2020 12:43:18 -0700 [thread overview]
Message-ID: <20200929194318.548707-1-ndesaulniers@google.com> (raw)
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
Fixes: commit e04462fb82f8 ("Compiler Attributes: remove uses of __attribute__ from compiler.h")
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
---
include/linux/compiler.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 92ef163a7479..ac45f6d40d39 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -155,7 +155,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
extern typeof(sym) sym; \
static const unsigned long __kentry_##sym \
__used \
- __section("___kentry" "+" #sym ) \
+ __attribute__((__section__("___kentry+" #sym))) \
= (unsigned long)&sym;
#endif
--
2.28.0.709.gb0816b6eb0-goog
next reply other threads:[~2020-09-29 19:43 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-29 19:43 Nick Desaulniers [this message]
2020-09-29 20:08 ` [PATCH] compiler.h: avoid escaped section names Arvind Sankar
2020-09-29 20:13 ` Arvind Sankar
2020-09-29 20:25 ` Nick Desaulniers
2020-09-29 20:30 ` Nick Desaulniers
2020-09-29 20:47 ` Arvind Sankar
2020-09-29 20:59 ` Nick Desaulniers
2020-09-30 15:40 ` Joe Perches
2020-09-30 18:33 ` Joe Perches
2020-09-30 23:10 ` convert_section.pl attached Joe Perches
2020-09-29 21:33 ` [PATCH] compiler.h: avoid escaped section names Miguel Ojeda
2020-09-30 8:33 ` David Laight
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