This is a note to let you know that I've just added the patch titled
compiler-intel: fix wrong compiler barrier() macro
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
compiler-intel-fix-wrong-compiler-barrier-macro.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b86a50c3b5414eafdbee7f34af4a201a4a7817c2 Mon Sep 17 00:00:00 2001
From: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Date: Thu, 25 Jun 2015 15:01:05 -0700
Subject: compiler-intel: fix wrong compiler barrier() macro
From: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
commit b86a50c3b5414eafdbee7f34af4a201a4a7817c2 upstream.
Cleanup commit 73679e508201 ("compiler-intel.h: Remove duplicate
definition") removed the double definition of __memory_barrier()
intrinsics.
However, in doing so, it also removed the preceding #undef barrier by
accident, meaning, the actual barrier() macro from compiler-gcc.h with
inline asm is still in place as __GNUC__ is provided.
Subsequently, barrier() can never be defined as __memory_barrier() from
compiler.h since it already has a definition in place and if we trust
the comment in compiler-intel.h, ecc doesn't support gcc specific asm
statements.
I don't have an ecc at hand (unsure if that's still used in the field?)
and only found this by accident during code review, a revert of that
cleanup would be simplest option.
Fixes: 73679e508201 ("compiler-intel.h: Remove duplicate definition")
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Reviewed-by: Pranith Kumar <bobby.prani@xxxxxxxxx>
Cc: Pranith Kumar <bobby.prani@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: mancha security <mancha1@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/compiler-intel.h | 2 ++
1 file changed, 2 insertions(+)
--- a/include/linux/compiler-intel.h
+++ b/include/linux/compiler-intel.h
@@ -13,10 +13,12 @@
/* Intel ECC compiler doesn't support gcc specific asm stmts.
* It uses intrinsics to do the equivalent things.
*/
+#undef barrier
#undef barrier_data
#undef RELOC_HIDE
#undef OPTIMIZER_HIDE_VAR
+#define barrier() __memory_barrier()
#define barrier_data(ptr) barrier()
#define RELOC_HIDE(ptr, off) \
Patches currently in stable-queue which might be from daniel@xxxxxxxxxxxxx are
queue-4.1/compiler-intel-fix-wrong-compiler-barrier-macro.patch
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