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| author | Al Viro <viro@zeniv.linux.org.uk> | 2017-03-20 19:03:16 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-04-06 09:08:08 +0300 |
| commit | 1a4fded6d32596053d4f0bc8c49028faf4114a17 (patch) | |
| tree | cea20321bc3851bad28db09a46b427ff52a8efce /arch/mips/cavium-octeon | |
| parent | ab0aca27c4dfcfa72eb1339ae94edbfbdd751ae8 (diff) | |
| download | linux-1a4fded6d32596053d4f0bc8c49028faf4114a17.tar.xz | |
mips: get rid of tail-zeroing in primitives
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/mips/cavium-octeon')
| -rw-r--r-- | arch/mips/cavium-octeon/octeon-memcpy.S | 31 |
1 files changed, 1 insertions, 30 deletions
diff --git a/arch/mips/cavium-octeon/octeon-memcpy.S b/arch/mips/cavium-octeon/octeon-memcpy.S index cfd97f6448bb..0a7c9834b81c 100644 --- a/arch/mips/cavium-octeon/octeon-memcpy.S +++ b/arch/mips/cavium-octeon/octeon-memcpy.S @@ -140,15 +140,6 @@ .set noat /* - * t7 is used as a flag to note inatomic mode. - */ -LEAF(__copy_user_inatomic) -EXPORT_SYMBOL(__copy_user_inatomic) - b __copy_user_common - li t7, 1 - END(__copy_user_inatomic) - -/* * A combined memcpy/__copy_user * __copy_user sets len to 0 for success; else to an upper bound of * the number of uncopied bytes. @@ -161,8 +152,6 @@ EXPORT_SYMBOL(memcpy) __memcpy: FEXPORT(__copy_user) EXPORT_SYMBOL(__copy_user) - li t7, 0 /* not inatomic */ -__copy_user_common: /* * Note: dst & src may be unaligned, len may be 0 * Temps @@ -414,25 +403,7 @@ l_exc: LOAD t0, TI_TASK($28) LOAD t0, THREAD_BUADDR(t0) # t0 is just past last good address SUB len, AT, t0 # len number of uncopied bytes - bnez t7, 2f /* Skip the zeroing out part if inatomic */ - /* - * Here's where we rely on src and dst being incremented in tandem, - * See (3) above. - * dst += (fault addr - src) to put dst at first byte to clear - */ - ADD dst, t0 # compute start address in a1 - SUB dst, src - /* - * Clear len bytes starting at dst. Can't call __bzero because it - * might modify len. An inefficient loop for these rare times... - */ - beqz len, done - SUB src, len, 1 -1: sb zero, 0(dst) - ADD dst, dst, 1 - bnez src, 1b - SUB src, src, 1 -2: jr ra + jr ra nop |