x86-64: Improve insn scheduling in SAVE_ARGS_IRQ

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In one case, use an address register that was computed earlier (and
with a simpler instruction), thus reducing the risk of a stall.

In the second case, eliminate a branch by using a conditional move (as
is already done in call_softirq and xen_do_hypervisor_callback).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Link: http://lkml.kernel.org/r/4F4788A50200007800074A26@nat28.tlf.novell.com
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

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Jan Beulich 2012-02-24 11:55:01 +00:00 • committed by H. Peter Anvin

parent b893485db9

commit 69466466ce

1 changed files with 3 additions and 4 deletions

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arch/x86/kernel/entry_64.S

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