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Subject[PATCH akpm] compiler-intel: fix wrong compiler barrier() macro
Date
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@iogearbox.net>
Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>
Cc: Pranith Kumar <bobby.prani@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: mancha security <mancha1@zoho.com>
---
Only resending fix for Andrew's tree, rebased.

include/linux/compiler-intel.h | 2 ++
1 file changed, 2 insertions(+)

diff --git a/include/linux/compiler-intel.h b/include/linux/compiler-intel.h
index 0c9a2f2..d4c7113 100644
--- 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) \
--
1.9.3


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