Commit 9d9bbd4d authored Jun 23, 2007 by Andi Kleen Committed by Linus Torvalds Jun 22, 2007

i386: Make CMPXCHG64 only dependent on PAE



It is only used for PAE kernels in set_64bit.

The problem is that due to a old Windows bug many CPUs need magic MSRs
to enable CMPXCHG64, and we can't do that nicely early enough before
it is potentially used.

But since we only need it in PAE kernels so only force the checking
for CMPXCHG65 with PAE.

This fixes a boot failure on Transmeta Crusoe

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 3f2c6d0f

arch/i386/Kconfig

+1 −1

Original line number	Diff line number	Diff line
		@@ -541,7 +541,7 @@ config HIGHMEM4G

		config HIGHMEM64G
		bool "64GB"
		depends on X86_CMPXCHG64
		depends on !M386 && !M486
		help
		Select this if you have a 32-bit processor and more than 4
		gigabytes of physical RAM.

arch/i386/Kconfig.cpu

+1 −1

Original line number	Diff line number	Diff line
		@@ -299,7 +299,7 @@ config X86_POPAD_OK

		config X86_CMPXCHG64
		bool
		depends on !M386 && !M486
		depends on X86_PAE
		default y

		config X86_ALIGNMENT_16

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