Re: [PATCH] x86-32: Fix alignment of alternative instructionentries
From: Thomas Gleixner
Date: Wed Sep 21 2011 - 06:06:57 EST
On Wed, 21 Sep 2011, Ben Hutchings wrote:
> The altinstruction_entry macro was originally used only on x86-64,
> and assumed 64-bit pointers and alignment.
>
> Commit b4ca46e4e82a0a5976fe5eab85be585d75f8202f ("x86-32: Fix boot
> with CONFIG_X86_INVD_BUG") introduced a use of the macro on x86-32.
> Before this, the 64-bit pointers had been replaced by 32-bit offsets,
> so it worked - in at least one case. However, the alignment is still
> wrong for x86-32, which can result in zero-padding between entries and
> a BUG in apply_alternatives.
Fixed in Linus tree already: commit a7f934d4f16144cb
Thanks,
tglx
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