[ARM] 5545/2: add flush_kernel_dcache_page() for ARM
Without this, the default implementation is a no op which is completely
wrong with a VIVT cache, and usage of sg_copy_buffer() produces
unpredictable results.
Tested-by: Sebastian Andrzej Siewior <bigeasy@breakpoint.cc>
CC: stable@kernel.org
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h
index bb7d695..1a711ea 100644
--- a/arch/arm/include/asm/cacheflush.h
+++ b/arch/arm/include/asm/cacheflush.h
@@ -429,6 +429,14 @@
__flush_anon_page(vma, page, vmaddr);
}
+#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
+static inline void flush_kernel_dcache_page(struct page *page)
+{
+ /* highmem pages are always flushed upon kunmap already */
+ if ((cache_is_vivt() || cache_is_vipt_aliasing()) && !PageHighMem(page))
+ __cpuc_flush_dcache_page(page_address(page));
+}
+
#define flush_dcache_mmap_lock(mapping) \
spin_lock_irq(&(mapping)->tree_lock)
#define flush_dcache_mmap_unlock(mapping) \