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| author | Hauke Mehrtens <hauke@hauke-m.de> | 2016-04-02 14:36:10 +0200 |
|---|---|---|
| committer | Hauke Mehrtens <hauke@hauke-m.de> | 2016-06-26 18:22:23 +0200 |
| commit | bf32177a1df123aa9b33c105d8895c81be81167a (patch) | |
| tree | 9e9bfd212c7bdd6205697dcb8254a928a2000d5c /target/linux/generic | |
| parent | 2abb02419d3c79d3ee8e732bccfd96a7fc959347 (diff) | |
| download | upstream-bf32177a1df123aa9b33c105d8895c81be81167a.tar.gz upstream-bf32177a1df123aa9b33c105d8895c81be81167a.tar.bz2 upstream-bf32177a1df123aa9b33c105d8895c81be81167a.zip | |
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')
3 files changed, 0 insertions, 96 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; diff --git a/target/linux/generic/patches-4.1/309-mips_fuse_workaround.patch b/target/linux/generic/patches-4.1/309-mips_fuse_workaround.patch deleted file mode 100644 index 7a3aa34435..0000000000 --- a/target/linux/generic/patches-4.1/309-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 -@@ -19,6 +19,9 @@ - #include <linux/pipe_fs_i.h> - #include <linux/swap.h> - #include <linux/splice.h> -+#ifdef CONFIG_MIPS -+#include <asm/cacheflush.h> -+#endif - - MODULE_ALIAS_MISCDEV(FUSE_MINOR); - MODULE_ALIAS("devname:fuse"); -@@ -816,6 +819,9 @@ 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; diff --git a/target/linux/generic/patches-4.4/309-mips_fuse_workaround.patch b/target/linux/generic/patches-4.4/309-mips_fuse_workaround.patch deleted file mode 100644 index 14d7962b94..0000000000 --- a/target/linux/generic/patches-4.4/309-mips_fuse_workaround.patch +++ /dev/null @@ -1,32 +0,0 @@ ---- a/arch/mips/mm/cache.c -+++ b/arch/mips/mm/cache.c -@@ -39,6 +39,7 @@ 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 -@@ -19,6 +19,9 @@ - #include <linux/pipe_fs_i.h> - #include <linux/swap.h> - #include <linux/splice.h> -+#ifdef CONFIG_MIPS -+#include <asm/cacheflush.h> -+#endif - - MODULE_ALIAS_MISCDEV(FUSE_MINOR); - MODULE_ALIAS("devname:fuse"); -@@ -802,6 +805,9 @@ 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; |