]> git.baikalelectronics.ru Git - kernel.git/commit
x86/entry/64: Simplify reg restore code in the standard IRET paths
authorAndy Lutomirski <luto@kernel.org>
Thu, 2 Nov 2017 07:59:01 +0000 (00:59 -0700)
committerIngo Molnar <mingo@kernel.org>
Thu, 2 Nov 2017 10:04:38 +0000 (11:04 +0100)
commit354474de095d776402d6081fb507d0804e3149b3
treeffa83766c761553325b3d1a6c2115f525ec3fcb7
parentf8e861f92e1eea78739c0b2e9a354795ba244ae2
x86/entry/64: Simplify reg restore code in the standard IRET paths

The old code restored all the registers with movq instead of pop.

In theory, this was done because some CPUs have higher movq
throughput, but any gain there would be tiny and is almost certainly
outweighed by the higher text size.

This saves 96 bytes of text.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/ad82520a207ccd851b04ba613f4f752b33ac05f7.1509609304.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/entry/calling.h
arch/x86/entry/entry_64.S