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authorAndi Kleen <ak@linux.intel.com>2018-01-17 23:53:28 +0100
committerThomas Gleixner <tglx@linutronix.de>2018-01-19 16:31:30 +0100
commit3f7d875566d8e79c5e0b2c9a413e91b2c29e0854 (patch)
tree0d0039aae333d220686378a027e38273c133e856 /Documentation
parentx86/pti: Document fix wrong index (diff)
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x86/retpoline: Optimize inline assembler for vmexit_fill_RSB
The generated assembler for the C fill RSB inline asm operations has several issues: - The C code sets up the loop register, which is then immediately overwritten in __FILL_RETURN_BUFFER with the same value again. - The C code also passes in the iteration count in another register, which is not used at all. Remove these two unnecessary operations. Just rely on the single constant passed to the macro for the iterations. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: David Woodhouse <dwmw@amazon.co.uk> Cc: dave.hansen@intel.com Cc: gregkh@linuxfoundation.org Cc: torvalds@linux-foundation.org Cc: arjan@linux.intel.com Link: https://lkml.kernel.org/r/20180117225328.15414-1-andi@firstfloor.org
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