diff options
| author |   Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2012-10-08 16:30:07 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-09 16:22:29 +0900 |
| commit | e3ebcf64381188a2744a9829a4eb5c2b60f1974c (patch) | |
| tree | 6c2bc18729bd6fc12b93d82403fad6afec319c3b /include | |
| parent | thp, x86: introduce HAVE_ARCH_TRANSPARENT_HUGEPAGE (diff) | |
| download | linux-dev-e3ebcf64381188a2744a9829a4eb5c2b60f1974c.tar.xz linux-dev-e3ebcf64381188a2744a9829a4eb5c2b60f1974c.zip | |
thp: remove assumptions on pgtable_t type
The thp page table pre-allocation code currently assumes that pgtable_t is
of type "struct page *". This may not be true for all architectures, so
this patch removes that assumption by replacing the functions
prepare_pmd_huge_pte() and get_pmd_huge_pte() with two new functions that
can be defined architecture-specific.
It also removes two VM_BUG_ON checks for page_count() and page_mapcount()
operating on a pgtable_t. Apart from the VM_BUG_ON removal, there will be
no functional change introduced by this patch.
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-generic/pgtable.h | 8 | ||||
| -rw-r--r-- | include/linux/huge_mm.h | 1 |
2 files changed, 8 insertions, 1 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index c9a612069c8e..044939f21c16 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -162,6 +162,14 @@ extern void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp); #endif +#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT +extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable); +#endif + +#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW +extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm); +#endif + #ifndef __HAVE_ARCH_PTE_SAME static inline int pte_same(pte_t pte_a, pte_t pte_b) { diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 4c59b1131187..6ab47af5a849 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -11,7 +11,6 @@ extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm, extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, pmd_t *pmd, pmd_t orig_pmd); -extern pgtable_t get_pmd_huge_pte(struct mm_struct *mm); extern struct page *follow_trans_huge_pmd(struct mm_struct *mm, unsigned long addr, pmd_t *pmd, |