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compiler-gcc: disable -ftracer for __noclone functions

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commit 95272c2937 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paolo Bonzini
2016-03-31 09:38:51 +02:00
committed by Greg Kroah-Hartman
parent 966bf1bea4
commit d4429b81f6
1 changed files with 1 additions and 1 deletions
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2
include/linux/compiler-gcc.h
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@@ -199,7 +199,7 @@
#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 */