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riscv: __asm_copy_to-from_user: Fix: Typos in comments

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Fixing typos and grammar mistakes and using more intuitive label
name.

Signed-off-by: Akira Tsukamoto <akira.tsukamoto@gmail.com>
Fixes: ca6eaaa210 ("riscv: __asm_copy_to-from_user: Optimize unaligned memory access and pipeline stall")
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Akira Tsukamoto 2021-07-20 17:53:23 +09:00 committed by Palmer Dabbelt
parent d4b3e0105e
commit ea196c548c
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1 changed files with 9 additions and 9 deletions
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18
arch/riscv/lib/uaccess.S
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@ -33,19 +33,20 @@ ENTRY(__asm_copy_from_user)
/*
* Use byte copy only if too small.
* SZREG holds 4 for RV32 and 8 for RV64
*/
li a3, 9*SZREG /* size must be larger than size in word_copy */
bltu a2, a3, .Lbyte_copy_tail
/*
* Copy first bytes until dst is align to word boundary.
* Copy first bytes until dst is aligned to word boundary.
* a0 - start of dst
* t1 - start of aligned dst
*/
addi t1, a0, SZREG-1
andi t1, t1, ~(SZREG-1)
/* dst is already aligned, skip */
beq a0, t1, .Lskip_first_bytes
beq a0, t1, .Lskip_align_dst
1:
/* a5 - one byte for copying data */
fixup lb a5, 0(a1), 10f
@ -54,7 +55,7 @@ ENTRY(__asm_copy_from_user)
addi a0, a0, 1 /* dst */
bltu a0, t1, 1b /* t1 - start of aligned dst */
.Lskip_first_bytes:
.Lskip_align_dst:
/*
* Now dst is aligned.
* Use shift-copy if src is misaligned.
@ -71,7 +72,6 @@ ENTRY(__asm_copy_from_user)
*
* a0 - start of aligned dst
* a1 - start of aligned src
* a3 - a1 & mask:(SZREG-1)
* t0 - end of aligned dst
*/
addi t0, t0, -(8*SZREG) /* not to over run */
@ -106,7 +106,7 @@ ENTRY(__asm_copy_from_user)
* For misaligned copy we still perform aligned word copy, but
* we need to use the value fetched from the previous iteration and
* do some shifts.
* This is safe because reading less than a word size.
* This is safe because reading is less than a word size.
*
* a0 - start of aligned dst
* a1 - start of src
@ -116,7 +116,7 @@ ENTRY(__asm_copy_from_user)
*/
/* calculating aligned word boundary for dst */
andi t1, t0, ~(SZREG-1)
/* Converting unaligned src to aligned arc */
/* Converting unaligned src to aligned src */
andi a1, a1, ~(SZREG-1)
/*
@ -128,7 +128,7 @@ ENTRY(__asm_copy_from_user)
li a5, SZREG*8
sub t4, a5, t3
/* Load the first word to combine with seceond word */
/* Load the first word to combine with second word */
fixup REG_L a5, 0(a1), 10f
3:
@ -160,7 +160,7 @@ ENTRY(__asm_copy_from_user)
* a1 - start of remaining src
* t0 - end of remaining dst
*/
bgeu a0, t0, 5f
bgeu a0, t0, .Lout_copy_user /* check if end of copy */
4:
fixup lb a5, 0(a1), 10f
addi a1, a1, 1 /* src */
@ -168,7 +168,7 @@ ENTRY(__asm_copy_from_user)
addi a0, a0, 1 /* dst */
bltu a0, t0, 4b /* t0 - end of dst */
5:
.Lout_copy_user:
/* Disable access to user memory */
csrc CSR_STATUS, t6
li a0, 0