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parisc: Mark altinstructions read-only and 32-bit aligned

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Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org   # v6.0+
This commit is contained in:
Helge Deller 2023-11-20 23:10:20 +01:00
parent a80aeb8654
commit 33f806da2d
1 changed files with 6 additions and 3 deletions
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9
arch/parisc/include/asm/alternative.h
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@ -34,7 +34,8 @@ void apply_alternatives(struct alt_instr *start, struct alt_instr *end,
/* Alternative SMP implementation. */
#define ALTERNATIVE(cond, replacement) "!0:" \
".section .altinstructions, \"aw\" !" \
".section .altinstructions, \"a\" !" \
".align 4 !" \
".word (0b-4-.) !" \
".hword 1, " __stringify(cond) " !" \
".word " __stringify(replacement) " !" \
@ -44,7 +45,8 @@ void apply_alternatives(struct alt_instr *start, struct alt_instr *end,
/* to replace one single instructions by a new instruction */
#define ALTERNATIVE(from, to, cond, replacement)\
.section .altinstructions, "aw" ! \
.section .altinstructions, "a" ! \
.align 4 ! \
.word (from - .) ! \
.hword (to - from)/4, cond ! \
.word replacement ! \
@ -52,7 +54,8 @@ void apply_alternatives(struct alt_instr *start, struct alt_instr *end,
/* to replace multiple instructions by new code */
#define ALTERNATIVE_CODE(from, num_instructions, cond, new_instr_ptr)\
.section .altinstructions, "aw" ! \
.section .altinstructions, "a" ! \
.align 4 ! \
.word (from - .) ! \
.hword -num_instructions, cond ! \
.word (new_instr_ptr - .) ! \