x86-64: Cleanup some assembly entry points

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system_call_after_swapgs doesn't really benefit from forcing
alignment from it - quite the opposite, native code needlessly
so far got a big NOP instruction inserted in front of it. Xen
being the only user of the separate entry point can well live
with the branch going to three bytes into a cache line.

The compatibility mode ptregs entry points for one can make use
of the GLOBAL() macro, and should be suitably aligned. Their
shared continuation point (ia32_ptregs_common) otoh doesn't need
to be global at all, but should continue to be properly aligned.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/4ED4CEEA020000780006407D@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Jan Beulich 2011-11-29 11:24:10 +00:00 • committed by Ingo Molnar

parent 46db09d3fd

commit f6b2bc8476

2 changed files with 5 additions and 4 deletions

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7

arch/x86/ia32/ia32entry.S

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2

arch/x86/kernel/entry_64.S

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