sh: Provide __flush_anon_page().
This provides a __flush_anon_page() that handles both the aliasing and
non-aliasing cases. This fixes up some crashes with heavy
get_user_pages() users.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/include/asm/cacheflush.h b/arch/sh/include/asm/cacheflush.h
index 4c85d55..5dffbd1 100644
--- a/arch/sh/include/asm/cacheflush.h
+++ b/arch/sh/include/asm/cacheflush.h
@@ -1,6 +1,8 @@
#ifndef __ASM_SH_CACHEFLUSH_H
#define __ASM_SH_CACHEFLUSH_H
+#include <linux/mm.h>
+
#ifdef __KERNEL__
#ifdef CONFIG_CACHE_OFF
@@ -43,6 +45,18 @@
extern void __flush_invalidate_region(void *start, int size);
#endif
+#ifdef CONFIG_MMU
+#define ARCH_HAS_FLUSH_ANON_PAGE
+extern void __flush_anon_page(struct page *page, unsigned long);
+
+static inline void flush_anon_page(struct vm_area_struct *vma,
+ struct page *page, unsigned long vmaddr)
+{
+ if (boot_cpu_data.dcache.n_aliases && PageAnon(page))
+ __flush_anon_page(page, vmaddr);
+}
+#endif
+
#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
static inline void flush_kernel_dcache_page(struct page *page)
{
diff --git a/arch/sh/mm/pg-mmu.c b/arch/sh/mm/pg-mmu.c
index a9ede7b..027c4d8 100644
--- a/arch/sh/mm/pg-mmu.c
+++ b/arch/sh/mm/pg-mmu.c
@@ -157,3 +157,20 @@
}
}
}
+
+void __flush_anon_page(struct page *page, unsigned long vmaddr)
+{
+ unsigned long addr = (unsigned long) page_address(page);
+
+ if (pages_do_alias(addr, vmaddr)) {
+ if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
+ !test_bit(PG_dcache_dirty, &page->flags)) {
+ void *kaddr;
+
+ kaddr = kmap_coherent(page, vmaddr);
+ __flush_wback_region((void *)kaddr, PAGE_SIZE);
+ kunmap_coherent();
+ } else
+ __flush_wback_region((void *)addr, PAGE_SIZE);
+ }
+}