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| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-03-31 09:38:51 +0200 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2016-11-20 01:17:39 +0000 |
| commit | a040696e6686ac65be13ee5a72c945e63c48be70 (patch) | |
| tree | e14486dd1fd29518beddb4a0c5c50be3df1a52e0 | |
| parent | f345b52fb87b5470434c9b70a761332d49cb3993 (diff) | |
| download | lwn-a040696e6686ac65be13ee5a72c945e63c48be70.tar.gz lwn-a040696e6686ac65be13ee5a72c945e63c48be70.zip | |
compiler-gcc: disable -ftracer for __noclone functions
commit 95272c29378ee7dc15f43fa2758cb28a5913a06d upstream.
-ftracer can duplicate asm blocks causing compilation to fail in
noclone functions. For example, KVM declares a global variable
in an asm like
asm("2: ... \n
.pushsection data \n
.global vmx_return \n
vmx_return: .long 2b");
and -ftracer causes a double declaration.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Marek <mmarek@suse.cz>
Cc: kvm@vger.kernel.org
Reported-by: Linda Walsh <lkml@tlinx.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Philip Müller <philm@manjaro.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | include/linux/compiler-gcc.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index bb2cdcd929c6..633716ef19b0 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -177,7 +177,7 @@ #define unreachable() __builtin_unreachable() /* Mark a function definition as prohibited from being cloned. */ -#define __noclone __attribute__((__noclone__)) +#define __noclone __attribute__((__noclone__, __optimize__("no-tracer"))) #endif /* GCC_VERSION >= 40500 */ |