Commit 9f9aecbf authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Ben Hutchings

compiler-gcc: disable -ftracer for __noclone functions

commit 95272c29 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: default avatarLinda Walsh <lkml@tlinx.org>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
[bwh: Backported to 3.16: apply to compiler-gcc{4,5}.h]
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 8be84a48
...@@ -54,7 +54,7 @@ ...@@ -54,7 +54,7 @@
#define unreachable() __builtin_unreachable() #define unreachable() __builtin_unreachable()
/* Mark a function definition as prohibited from being cloned. */ /* Mark a function definition as prohibited from being cloned. */
#define __noclone __attribute__((__noclone__)) #define __noclone __attribute__((__noclone__, __optimize__("no-tracer")))
#endif /* GCC_VERSION >= 40500 */ #endif /* GCC_VERSION >= 40500 */
......
...@@ -40,7 +40,7 @@ ...@@ -40,7 +40,7 @@
#define unreachable() __builtin_unreachable() #define unreachable() __builtin_unreachable()
/* Mark a function definition as prohibited from being cloned. */ /* Mark a function definition as prohibited from being cloned. */
#define __noclone __attribute__((__noclone__)) #define __noclone __attribute__((__noclone__, __optimize__("no-tracer")))
/* /*
* Tell the optimizer that something else uses this function or variable. * Tell the optimizer that something else uses this function or variable.
......
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