On Tue, Sep 29, 2020 at 12:43:18PM -0700, Nick Desaulniers wrote: > 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 <ndesaulni...@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 >
There was this previous mini-thread: https://lore.kernel.org/lkml/20200629205448.ga1474...@rani.riverdale.lan/ and this older one: https://lore.kernel.org/lkml/20190904181740.ga19...@gmail.com/ Just for my own curiosity: how does KENTRY actually get used? grep doesn't show any hits, and the thread from 2019 was actually going to drop it if I read it right, and also just remove stringification from the __section macro. There are still other instances that need to be fixed, right? Thanks.
