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authorRalf Baechle <ralf@linux-mips.org>2006-12-12 12:14:57 -0500
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-13 12:27:08 -0500
commitec8c0446b6e2b67b5c8813eb517f4bf00efa99a9 (patch)
treee7c12d7c486c958a5e38888b41cfcd6a558f1aff /include/asm-sh
parentbcd022801ee514e28c32837f0b3ce18c775f1a7b (diff)
[PATCH] Optimize D-cache alias handling on fork
Virtually index, physically tagged cache architectures can get away without cache flushing when forking. This patch adds a new cache flushing function flush_cache_dup_mm(struct mm_struct *) which for the moment I've implemented to do the same thing on all architectures except on MIPS where it's a no-op. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-sh')
-rw-r--r--include/asm-sh/cpu-sh2/cacheflush.h2
-rw-r--r--include/asm-sh/cpu-sh3/cacheflush.h3
-rw-r--r--include/asm-sh/cpu-sh4/cacheflush.h1
3 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-sh/cpu-sh2/cacheflush.h b/include/asm-sh/cpu-sh2/cacheflush.h
index f556fa80ea97..2979efb26de3 100644
--- a/include/asm-sh/cpu-sh2/cacheflush.h
+++ b/include/asm-sh/cpu-sh2/cacheflush.h
@@ -15,6 +15,7 @@
15 * 15 *
16 * - flush_cache_all() flushes entire cache 16 * - flush_cache_all() flushes entire cache
17 * - flush_cache_mm(mm) flushes the specified mm context's cache lines 17 * - flush_cache_mm(mm) flushes the specified mm context's cache lines
18 * - flush_cache_dup mm(mm) handles cache flushing when forking
18 * - flush_cache_page(mm, vmaddr, pfn) flushes a single page 19 * - flush_cache_page(mm, vmaddr, pfn) flushes a single page
19 * - flush_cache_range(vma, start, end) flushes a range of pages 20 * - flush_cache_range(vma, start, end) flushes a range of pages
20 * 21 *
@@ -27,6 +28,7 @@
27 */ 28 */
28#define flush_cache_all() do { } while (0) 29#define flush_cache_all() do { } while (0)
29#define flush_cache_mm(mm) do { } while (0) 30#define flush_cache_mm(mm) do { } while (0)
31#define flush_cache_dup_mm(mm) do { } while (0)
30#define flush_cache_range(vma, start, end) do { } while (0) 32#define flush_cache_range(vma, start, end) do { } while (0)
31#define flush_cache_page(vma, vmaddr, pfn) do { } while (0) 33#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
32#define flush_dcache_page(page) do { } while (0) 34#define flush_dcache_page(page) do { } while (0)
diff --git a/include/asm-sh/cpu-sh3/cacheflush.h b/include/asm-sh/cpu-sh3/cacheflush.h
index 03fde97a7fd0..f70d8ef76a15 100644
--- a/include/asm-sh/cpu-sh3/cacheflush.h
+++ b/include/asm-sh/cpu-sh3/cacheflush.h
@@ -15,6 +15,7 @@
15 * 15 *
16 * - flush_cache_all() flushes entire cache 16 * - flush_cache_all() flushes entire cache
17 * - flush_cache_mm(mm) flushes the specified mm context's cache lines 17 * - flush_cache_mm(mm) flushes the specified mm context's cache lines
18 * - flush_cache_dup mm(mm) handles cache flushing when forking
18 * - flush_cache_page(mm, vmaddr, pfn) flushes a single page 19 * - flush_cache_page(mm, vmaddr, pfn) flushes a single page
19 * - flush_cache_range(vma, start, end) flushes a range of pages 20 * - flush_cache_range(vma, start, end) flushes a range of pages
20 * 21 *
@@ -39,6 +40,7 @@
39 40
40void flush_cache_all(void); 41void flush_cache_all(void);
41void flush_cache_mm(struct mm_struct *mm); 42void flush_cache_mm(struct mm_struct *mm);
43#define flush_cache_dup_mm(mm) flush_cache_mm(mm)
42void flush_cache_range(struct vm_area_struct *vma, unsigned long start, 44void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
43 unsigned long end); 45 unsigned long end);
44void flush_cache_page(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn); 46void flush_cache_page(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn);
@@ -48,6 +50,7 @@ void flush_icache_page(struct vm_area_struct *vma, struct page *page);
48#else 50#else
49#define flush_cache_all() do { } while (0) 51#define flush_cache_all() do { } while (0)
50#define flush_cache_mm(mm) do { } while (0) 52#define flush_cache_mm(mm) do { } while (0)
53#define flush_cache_dup_mm(mm) do { } while (0)
51#define flush_cache_range(vma, start, end) do { } while (0) 54#define flush_cache_range(vma, start, end) do { } while (0)
52#define flush_cache_page(vma, vmaddr, pfn) do { } while (0) 55#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
53#define flush_dcache_page(page) do { } while (0) 56#define flush_dcache_page(page) do { } while (0)
diff --git a/include/asm-sh/cpu-sh4/cacheflush.h b/include/asm-sh/cpu-sh4/cacheflush.h
index 515fd574267c..b01a10f31225 100644
--- a/include/asm-sh/cpu-sh4/cacheflush.h
+++ b/include/asm-sh/cpu-sh4/cacheflush.h
@@ -18,6 +18,7 @@
18 */ 18 */
19void flush_cache_all(void); 19void flush_cache_all(void);
20void flush_cache_mm(struct mm_struct *mm); 20void flush_cache_mm(struct mm_struct *mm);
21#define flush_cache_dup_mm(mm) flush_cache_mm(mm)
21void flush_cache_range(struct vm_area_struct *vma, unsigned long start, 22void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
22 unsigned long end); 23 unsigned long end);
23void flush_cache_page(struct vm_area_struct *vma, unsigned long addr, 24void flush_cache_page(struct vm_area_struct *vma, unsigned long addr,