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thp: add x86 32bit support

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Add support for transparent hugepages to x86 32bit.

Share the same VM_ bitflag for VM_MAPPED_COPY.  mm/nommu.c will never
support transparent hugepages.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner
2011-01-13 15:47:01 -08:00
committed by Linus Torvalds
parent 5f24ce5fd3
commit f2d6bfe9ff
7 changed files with 156 additions and 115 deletions
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23
arch/x86/include/asm/pgtable-3level.h
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@@ -104,6 +104,29 @@ static inline pte_t native_ptep_get_and_clear(pte_t *ptep)
#define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
#endif
#ifdef CONFIG_SMP
union split_pmd {
struct {
u32 pmd_low;
u32 pmd_high;
};
pmd_t pmd;
};
static inline pmd_t native_pmdp_get_and_clear(pmd_t *pmdp)
{
union split_pmd res, *orig = (union split_pmd *)pmdp;
/* xchg acts as a barrier before setting of the high bits */
res.pmd_low = xchg(&orig->pmd_low, 0);
res.pmd_high = orig->pmd_high;
orig->pmd_high = 0;
return res.pmd;
}
#else
#define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp)
#endif
/*
* Bits 0, 6 and 7 are taken in the low part of the pte,
* put the 32 bits of offset into the high part.