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| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2008-04-28 02:13:28 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-28 08:58:25 -0700 |
| commit | 8fe627ec5b7c47b1654dff50536d9709863295a3 (patch) | |
| tree | 78511553eb4111224e89ef02a9436d0db382694b /include/asm-sh | |
| parent | 6d779079bfd1196e077bb1d0a906c37ae770b102 (diff) | |
| download | linux-8fe627ec5b7c47b1654dff50536d9709863295a3.tar.bz2 | |
hugetlbfs: add missing TLB flush to hugetlb_cow()
A cow break on a hugetlbfs page with page_count > 1 will set a new pte with
set_huge_pte_at(), w/o any tlb flush operation. The old pte will remain in
the tlb and subsequent write access to the page will result in a page fault
loop, for as long as it may take until the tlb is flushed from somewhere else.
This patch introduces an architecture-specific huge_ptep_clear_flush()
function, which is called before the the set_huge_pte_at() in hugetlb_cow().
ATTENTION: This is just a nop on all architectures for now, the s390
implementation will come with our large page patch later. Other architectures
should define their own huge_ptep_clear_flush() if needed.
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-sh')
| -rw-r--r-- | include/asm-sh/hugetlb.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/asm-sh/hugetlb.h b/include/asm-sh/hugetlb.h index 885218d2c844..d1ed476467a1 100644 --- a/include/asm-sh/hugetlb.h +++ b/include/asm-sh/hugetlb.h @@ -46,4 +46,9 @@ static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, return ptep_get_and_clear(mm, addr, ptep); } +static inline void huge_ptep_clear_flush(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep) +{ +} + #endif /* _ASM_SH_HUGETLB_H */ |