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authorAl Viro <viro@zeniv.linux.org.uk>2017-03-20 12:03:16 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2017-04-06 02:08:08 -0400
commit1a4fded6d32596053d4f0bc8c49028faf4114a17 (patch)
treecea20321bc3851bad28db09a46b427ff52a8efce /arch/mips/lib
parentab0aca27c4dfcfa72eb1339ae94edbfbdd751ae8 (diff)
downloadlinux-1a4fded6d32596053d4f0bc8c49028faf4114a17.tar.bz2
mips: get rid of tail-zeroing in primitives
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/mips/lib')
-rw-r--r--arch/mips/lib/memcpy.S49
1 files changed, 0 insertions, 49 deletions
diff --git a/arch/mips/lib/memcpy.S b/arch/mips/lib/memcpy.S
index c3031f18c572..3114a2ed1f4e 100644
--- a/arch/mips/lib/memcpy.S
+++ b/arch/mips/lib/memcpy.S
@@ -562,39 +562,9 @@
LOADK t0, THREAD_BUADDR(t0) # t0 is just past last good address
nop
SUB len, AT, t0 # len number of uncopied bytes
- bnez t6, .Ldone\@ /* Skip the zeroing 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...
- */
- .set reorder /* DADDI_WAR */
- SUB src, len, 1
- beqz len, .Ldone\@
- .set noreorder
-1: sb zero, 0(dst)
- ADD dst, dst, 1
-#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
- bnez src, 1b
- SUB src, src, 1
-#else
- .set push
- .set noat
- li v1, 1
- bnez src, 1b
- SUB src, src, v1
- .set pop
-#endif
jr ra
nop
-
#define SEXC(n) \
.set reorder; /* DADDI_WAR */ \
.Ls_exc_p ## n ## u\@: \
@@ -673,15 +643,6 @@ LEAF(__rmemcpy) /* a0=dst a1=src a2=len */
END(__rmemcpy)
/*
- * t6 is used as a flag to note inatomic mode.
- */
-LEAF(__copy_user_inatomic)
-EXPORT_SYMBOL(__copy_user_inatomic)
- b __copy_user_common
- li t6, 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.
@@ -694,8 +655,6 @@ EXPORT_SYMBOL(memcpy)
.L__memcpy:
FEXPORT(__copy_user)
EXPORT_SYMBOL(__copy_user)
- li t6, 0 /* not inatomic */
-__copy_user_common:
/* Legacy Mode, user <-> user */
__BUILD_COPY_USER LEGACY_MODE USEROP USEROP
@@ -708,20 +667,12 @@ __copy_user_common:
* space
*/
-LEAF(__copy_user_inatomic_eva)
-EXPORT_SYMBOL(__copy_user_inatomic_eva)
- b __copy_from_user_common
- li t6, 1
- END(__copy_user_inatomic_eva)
-
/*
* __copy_from_user (EVA)
*/
LEAF(__copy_from_user_eva)
EXPORT_SYMBOL(__copy_from_user_eva)
- li t6, 0 /* not inatomic */
-__copy_from_user_common:
__BUILD_COPY_USER EVA_MODE USEROP KERNELOP
END(__copy_from_user_eva)