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LTO in gcc 4.6/47. has trouble with global register variables. They were used
to read the stack pointer. Use a simple inline assembler statement with
a mov instead.
This also helps LLVM/clang, which does not support global register
variables.
[ hpa: Ideally this should become a builtin in both gcc and clang. ]
v2: More general asm constraint. Fix description (Jan Beulich)
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1382458079-24450-6-git-send-email-andi@firstfloor.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
dff38e3e93