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>

1 files changed, 1 insertions, 1 deletions

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 <blogic@openwrt.org>
  {
 --- 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);