x86: minor cleanup in the espfix code

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Impact: Cleanup

Checkin be44d2aabc eliminates the use of
a 16-bit stack for espfix.  However, at least one instruction remained
that only operated on the low 16 bits of %esp.

This is not a bug per se because the kernel stack is always an aligned
4K or 8K block.  Therefore it cannot cross 64K boundaries; this code,
in fact, relies strictly on that fact.

However, it's a lot cleaner (and, for that matter, smaller) to operate
on the entire 32-bit register.

Signed-off-by: Stas Sergeev <stsp@aknet.ru>
CC: Zachary Amsden <zach@vmware.com>
CC: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

...

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Stas Sergeev 2009-02-23 19:13:07 +03:00 • committed by H. Peter Anvin

parent 2366c298b5

commit bda3a89745

1 changed files with 1 additions and 1 deletions

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arch/x86/kernel/entry_32.S

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