From: Nick Desaulniers > Sent: 29 September 2020 20:43 > > 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@xxxxxxxxxx> > --- > 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 I guess what this really wants is: __section(__kentry+##sym) but that generates an error because you can only use ## between variable names. Perhaps someone shouldn't have tries to be clever and not put an unusual character in the section name. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
