From bf32177a1df123aa9b33c105d8895c81be81167a Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Sat, 2 Apr 2016 14:36:10 +0200 Subject: 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 --- target/linux/lantiq/patches-4.4/0004-MIPS-lantiq-add-atm-hack.patch | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'target/linux/lantiq') diff --git a/target/linux/lantiq/patches-4.4/0004-MIPS-lantiq-add-atm-hack.patch b/target/linux/lantiq/patches-4.4/0004-MIPS-lantiq-add-atm-hack.patch index 6b97f395ec..53809d0a8f 100644 --- a/target/linux/lantiq/patches-4.4/0004-MIPS-lantiq-add-atm-hack.patch +++ b/target/linux/lantiq/patches-4.4/0004-MIPS-lantiq-add-atm-hack.patch @@ -441,7 +441,7 @@ Signed-off-by: John Crispin { --- a/arch/mips/mm/cache.c +++ b/arch/mips/mm/cache.c -@@ -60,6 +60,8 @@ void (*_dma_cache_wback)(unsigned long s +@@ -59,6 +59,8 @@ void (*_dma_cache_wback)(unsigned long s void (*_dma_cache_inv)(unsigned long start, unsigned long size); EXPORT_SYMBOL(_dma_cache_wback_inv); -- cgit v1.2.3