[PATCH] x86, setup: Additional __flush_tlb for Quak X1000

From: Ong Boon Leong
Date: Fri Sep 26 2014 - 00:31:26 EST


With respect to submission sent below:
"x86: Quark: Comment setup_arch for TLB/PGE bugfix"

__flush_tlb_all() does not take __flush_tlb() because cpu_has_pge
flag that is setup in head_32.S by CPUID and not changed much later.
So, the comment added are incorrect. Explaination below:

For change on:

"x86/intel/quark: Switch off CR4.PGE so TLB flush uses CR3 instead"

The X86_FEATURE_PGE cap is cleared in early_cpu_init() -->
early_identify_cpu() --> early_init_intel(). And, early_cpu_init()
is performed after the __flush_tlb_all() step.

Anyway, thanks to Bryan for submitting patch for Quark SoC.

FYI, the suggestion to add __flush_tlb() has been discussed with some
of the kernel developers CC'ed below inclusing HPA himself.

Thank you very much,
Ong Boon Leong

Ong Boon Leong (1):
x86, setup: add __flush_tlb() for Intel Quark X1000

arch/x86/kernel/setup.c | 7 +++++++
1 file changed, 7 insertions(+)


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