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| author | Lars Persson <lars.persson@axis.com> | 2015-02-26 16:16:02 +0300 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-03-25 15:48:00 +0300 |
| commit | 5b9593f3bccb9904f260f9ad7f184e1d2921bd1e (patch) | |
| tree | 06d4c30e6863919a084d467f6c0917e5e8922a7c /arch/mips/mm/cache.c | |
| parent | 9a49899eb88803dcc0ef437f09912f9a7b7a66fd (diff) | |
| download | linux-5b9593f3bccb9904f260f9ad7f184e1d2921bd1e.tar.xz | |
Revert "MIPS: Remove race window in page fault handling"
Revert commit 2a4a8b1e5d9d ("MIPS: Remove race window in page fault
handling") because it increased the number of flushed dcache pages and
became a performance problem for some workloads.
Signed-off-by: Lars Persson <larper@axis.com>
Cc: linux-mips@linux-mips.org
Cc: paul.burton@imgtec.com
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9345/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mm/cache.c')
| -rw-r--r-- | arch/mips/mm/cache.c | 27 |
1 files changed, 8 insertions, 19 deletions
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c index 7e3ea7766822..f7b91d3a371d 100644 --- a/arch/mips/mm/cache.c +++ b/arch/mips/mm/cache.c @@ -119,36 +119,25 @@ void __flush_anon_page(struct page *page, unsigned long vmaddr) EXPORT_SYMBOL(__flush_anon_page); -static void mips_flush_dcache_from_pte(pte_t pteval, unsigned long address) +void __update_cache(struct vm_area_struct *vma, unsigned long address, + pte_t pte) { struct page *page; - unsigned long pfn = pte_pfn(pteval); + unsigned long pfn, addr; + int exec = (vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc; + pfn = pte_pfn(pte); if (unlikely(!pfn_valid(pfn))) return; - page = pfn_to_page(pfn); if (page_mapping(page) && Page_dcache_dirty(page)) { - unsigned long page_addr = (unsigned long) page_address(page); - - if (!cpu_has_ic_fills_f_dc || - pages_do_alias(page_addr, address & PAGE_MASK)) - flush_data_cache_page(page_addr); + addr = (unsigned long) page_address(page); + if (exec || pages_do_alias(addr, address & PAGE_MASK)) + flush_data_cache_page(addr); ClearPageDcacheDirty(page); } } -void set_pte_at(struct mm_struct *mm, unsigned long addr, - pte_t *ptep, pte_t pteval) -{ - if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc) { - if (pte_present(pteval)) - mips_flush_dcache_from_pte(pteval, addr); - } - - set_pte(ptep, pteval); -} - unsigned long _page_cachable_default; EXPORT_SYMBOL(_page_cachable_default); |