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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-12-18 16:31:38 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-01-20 13:48:30 +0000 |
| commit | ed42acaef1a9d51631a31b55e9ed52d400430492 (patch) | |
| tree | 62b93dda8ee5eb1c31a3233df3e0f244dd83b367 | |
| parent | 56dd47098abe1fdde598a8d8b7c04d775506f456 (diff) | |
| download | linux-ed42acaef1a9d51631a31b55e9ed52d400430492.tar.gz linux-ed42acaef1a9d51631a31b55e9ed52d400430492.tar.bz2 linux-ed42acaef1a9d51631a31b55e9ed52d400430492.zip | |
ARM: make_coherent: avoid recalculating the pfn for the modified page
We already know the pfn for the page to be modified in make_coherent,
so let's stop recalculating it unnecessarily.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/mm/fault-armv.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c index 8e9bc517132e..ae88f2c3a6df 100644 --- a/arch/arm/mm/fault-armv.c +++ b/arch/arm/mm/fault-armv.c @@ -37,7 +37,7 @@ static unsigned long shared_pte_mask = L_PTE_MT_BUFFERABLE; * without CONFIG_CPU_CACHE_VIPT) cannot support split page_table_lock. */ static int do_adjust_pte(struct vm_area_struct *vma, unsigned long address, - pte_t *ptep) + unsigned long pfn, pte_t *ptep) { pte_t entry = *ptep; int ret; @@ -52,7 +52,6 @@ static int do_adjust_pte(struct vm_area_struct *vma, unsigned long address, * fault (ie, is old), we can safely ignore any issues. */ if (ret && (pte_val(entry) & L_PTE_MT_MASK) != shared_pte_mask) { - unsigned long pfn = pte_pfn(entry); flush_cache_page(vma, address, pfn); outer_flush_range((pfn << PAGE_SHIFT), (pfn << PAGE_SHIFT) + PAGE_SIZE); @@ -65,7 +64,8 @@ static int do_adjust_pte(struct vm_area_struct *vma, unsigned long address, return ret; } -static int adjust_pte(struct vm_area_struct *vma, unsigned long address) +static int adjust_pte(struct vm_area_struct *vma, unsigned long address, + unsigned long pfn) { spinlock_t *ptl; pgd_t *pgd; @@ -90,7 +90,7 @@ static int adjust_pte(struct vm_area_struct *vma, unsigned long address) pte = pte_offset_map_nested(pmd, address); spin_lock(ptl); - ret = do_adjust_pte(vma, address, pte); + ret = do_adjust_pte(vma, address, pfn, pte); spin_unlock(ptl); pte_unmap_nested(pte); @@ -127,11 +127,11 @@ make_coherent(struct address_space *mapping, struct vm_area_struct *vma, unsigne if (!(mpnt->vm_flags & VM_MAYSHARE)) continue; offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT; - aliases += adjust_pte(mpnt, mpnt->vm_start + offset); + aliases += adjust_pte(mpnt, mpnt->vm_start + offset, pfn); } flush_dcache_mmap_unlock(mapping); if (aliases) - adjust_pte(vma, addr); + adjust_pte(vma, addr, pfn); else flush_cache_page(vma, addr, pfn); } |