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[added,to,the,3.18,stable,tree] compiler-gcc: disable -ftracer for __noclone functions

Message ID 1461376837-29899-20-git-send-email-sasha.levin@oracle.com (mailing list archive)
State New, archived
Headers show

Commit Message

Sasha Levin April 23, 2016, 2 a.m. UTC 
From: Paolo Bonzini <pbonzini@redhat.com>

This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
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Patch

===============

[ Upstream commit 95272c29378ee7dc15f43fa2758cb28a5913a06d ]

-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: stable@vger.kernel.org
Cc: kvm@vger.kernel.org
Reported-by: Linda Walsh <lkml@tlinx.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---
 include/linux/compiler-gcc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index bb2cdcd..633716e 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 */