3.10-stable review patch. If anyone has any objections, please let me know.
------------------ From: Catalin Marinas <[email protected]> commit 7249b79f6b4cc3c2aa9138dca52e535a4c789107 upstream. The D-cache on AArch64 is VIPT non-aliasing, so there is no need to flush it for anonymous pages. Signed-off-by: Catalin Marinas <[email protected]> Reported-by: Will Deacon <[email protected]> Acked-by: Will Deacon <[email protected]> Cc: Mark Brown <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/arm64/mm/flush.c | 8 +++----- arch/arm64/mm/mmu.c | 1 - 2 files changed, 3 insertions(+), 6 deletions(-) --- a/arch/arm64/mm/flush.c +++ b/arch/arm64/mm/flush.c @@ -77,14 +77,12 @@ void __flush_dcache_page(struct page *pa void __sync_icache_dcache(pte_t pte, unsigned long addr) { - unsigned long pfn; - struct page *page; + struct page *page = pte_page(pte); - pfn = pte_pfn(pte); - if (!pfn_valid(pfn)) + /* no flushing needed for anonymous pages */ + if (!page_mapping(page)) return; - page = pfn_to_page(pfn); if (!test_and_set_bit(PG_dcache_clean, &page->flags)) { __flush_dcache_page(page); __flush_icache_all(); --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -339,7 +339,6 @@ void __init paging_init(void) bootmem_init(); empty_zero_page = virt_to_page(zero_page); - __flush_dcache_page(empty_zero_page); /* * TTBR0 is only used for the identity mapping at this stage. Make it -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
