arm64: Avoid cache flushing in flush_dcache_page()

The flush_dcache_page() function is called when the kernel modified a
page cache page. Since the D-cache on AArch64 does not have aliases
this function can simply mark the page as dirty for later flushing via
set_pte_at()/__sync_icache_dcache() if the page is executable (to ensure
the I-D cache coherency).

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Will Deacon <will.deacon@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>

1 files changed, 4 insertions, 18 deletions

diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
index 88611c3a421a..b9cd7a4deeca 100644
--- a/arch/arm64/mm/flush.c
+++ b/arch/arm64/mm/flush.c
@@ -94,28 +94,14 @@ void __sync_icache_dcache(pte_t pte, unsigned long addr)
 }
 
 /*
- * Ensure cache coherency between kernel mapping and userspace mapping of this
- * page.
+ * This function is called when a page has been modified by the kernel. Mark
+ * it as dirty for later flushing when mapped in user space (if executable,
+ * see __sync_icache_dcache).
  */
 void flush_dcache_page(struct page *page)
 {
-        struct address_space *mapping;
-
-        /*
-         * The zero page is never written to, so never has any dirty cache
-         * lines, and therefore never needs to be flushed.
-         */
-        if (page == ZERO_PAGE(0))
-                return;
-
-        mapping = page_mapping(page);
-        if (mapping && mapping_mapped(mapping)) {
-                __flush_dcache_page(page);
-                __flush_icache_all();
-                set_bit(PG_dcache_clean, &page->flags);
-        } else {
+        if (test_bit(PG_dcache_clean, &page->flags))
                 clear_bit(PG_dcache_clean, &page->flags);
-        }
 }
 EXPORT_SYMBOL(flush_dcache_page);