From: David Daney <ddaney@xxxxxxxxxxxxxxxxxx> The generic version seems to prefetch past the end of memory. Signed-off-by: David Daney <ddaney@xxxxxxxxxxxxxxxxxx> --- arch/mips/cavium-octeon/octeon-memcpy.S | 16 ++++++++++++---- 1 files changed, 12 insertions(+), 4 deletions(-) diff --git a/arch/mips/cavium-octeon/octeon-memcpy.S b/arch/mips/cavium-octeon/octeon-memcpy.S index 88e0cdd..d55bd6a 100644 --- a/arch/mips/cavium-octeon/octeon-memcpy.S +++ b/arch/mips/cavium-octeon/octeon-memcpy.S @@ -164,6 +164,14 @@ .set noat /* + * t7 is used as a flag to note inatomic mode. + */ +LEAF(__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. @@ -174,6 +182,8 @@ LEAF(memcpy) /* a0=dst a1=src a2=len */ move v0, dst /* return value */ __memcpy: FEXPORT(__copy_user) + li t7, 0 /* not inatomic */ +__copy_user_common: /* * Note: dst & src may be unaligned, len may be 0 * Temps @@ -412,7 +422,6 @@ l_exc_copy: * Assumes src < THREAD_BUADDR($28) */ LOAD t0, TI_TASK($28) - nop LOAD t0, THREAD_BUADDR(t0) 1: EXC( lb t1, 0(src), l_exc) @@ -422,10 +431,9 @@ EXC( lb t1, 0(src), l_exc) ADD dst, dst, 1 l_exc: LOAD t0, TI_TASK($28) - nop LOAD t0, THREAD_BUADDR(t0) # t0 is just past last good address - nop 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. @@ -443,7 +451,7 @@ l_exc: ADD dst, dst, 1 bnez src, 1b SUB src, src, 1 - jr ra +2: jr ra nop -- 1.7.2.3
