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authorHauke Mehrtens <hauke@hauke-m.de>2016-04-02 14:36:10 +0200
committerHauke Mehrtens <hauke@hauke-m.de>2016-06-26 18:22:23 +0200
commitbf32177a1df123aa9b33c105d8895c81be81167a (patch)
tree9e9bfd212c7bdd6205697dcb8254a928a2000d5c /target/linux/generic/patches-3.18
parent2abb02419d3c79d3ee8e732bccfd96a7fc959347 (diff)
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kernel: remove full cache flush in fuse_copy_do() for MIPS
This patch was introduced in commit r16412 for the brcm47xx target only and then moved to generic in commit r32395. It was initially added because of ticket #5186 and should fix some problems with fuse file systems and MIPS caches. The commit comment in r32395 says that this a generic problem in MIPS CPUs, but does not name any specifics about that. There was a fix added to kernel 2.6.21 in commit commit 7575a49f20 "[MIPS] Implement flush_anon_page()." that should fix this problem, but that was already available before both commits were done to OpenWrt. I just tested fuse with ntfs.3g without this patch on a BCM4704 (BMIPS3300 V0.6) SoC and haven't seen any problems. Someone reported that removing this patch improves some fuse operations by 5 times on some modern MIPS cores. My test was only a simple "dd if=/dev/zero of=/mnt/zero bs=5000" to an USB stick. This patch removes the patch to OpenWrt, because I assume that it is not needed any more and Felix, the orginal author, also thinks so. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Diffstat (limited to 'target/linux/generic/patches-3.18')
-rw-r--r--target/linux/generic/patches-3.18/309-mips_fuse_workaround.patch32
1 files changed, 0 insertions, 32 deletions
diff --git a/target/linux/generic/patches-3.18/309-mips_fuse_workaround.patch b/target/linux/generic/patches-3.18/309-mips_fuse_workaround.patch
deleted file mode 100644
index 934b1198f4..0000000000
--- a/target/linux/generic/patches-3.18/309-mips_fuse_workaround.patch
+++ /dev/null
@@ -1,32 +0,0 @@
---- a/arch/mips/mm/cache.c
-+++ b/arch/mips/mm/cache.c
-@@ -38,6 +38,7 @@ void (*__flush_cache_vunmap)(void);
-
- void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
- EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
-+EXPORT_SYMBOL(__flush_cache_all);
- void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);
-
- /* MIPS specific cache operations */
---- a/fs/fuse/dev.c
-+++ b/fs/fuse/dev.c
-@@ -20,6 +20,9 @@
- #include <linux/swap.h>
- #include <linux/splice.h>
- #include <linux/aio.h>
-+#ifdef CONFIG_MIPS
-+#include <asm/cacheflush.h>
-+#endif
-
- MODULE_ALIAS_MISCDEV(FUSE_MINOR);
- MODULE_ALIAS("devname:fuse");
-@@ -749,6 +752,9 @@ static int fuse_copy_fill(struct fuse_co
- static int fuse_copy_do(struct fuse_copy_state *cs, void **val, unsigned *size)
- {
- unsigned ncpy = min(*size, cs->len);
-+#ifdef CONFIG_MIPS
-+ __flush_cache_all();
-+#endif
- if (val) {
- void *pgaddr = kmap_atomic(cs->pg);
- void *buf = pgaddr + cs->offset;