Messages in this thread Patch in this message | | | From | Emil Renner Berthing <> | Subject | [PATCH] riscv: Grab text_mutex before patching jump-labels | Date | Thu, 23 Jul 2020 18:36:28 +0200 |
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Like other arch's we use patch_text_nosync or equivalent to patch the jump-labels, but also like other arch's we need to hold the text_mutex before calling that.
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk> ---
Fixes: b6e0878a4ec8 ("riscv: Add jump-label implementation") ..that is already in riscv/for-next.
Palmer: Sorry, I didn't notice this before. Feel free to squash this into the commit above if you like. --- arch/riscv/kernel/jump_label.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/kernel/jump_label.c b/arch/riscv/kernel/jump_label.c index 1bab1abc1aa5..20e09056d141 100644 --- a/arch/riscv/kernel/jump_label.c +++ b/arch/riscv/kernel/jump_label.c @@ -4,8 +4,10 @@ * * Based on arch/arm64/kernel/jump_label.c */ -#include <linux/kernel.h> #include <linux/jump_label.h> +#include <linux/kernel.h> +#include <linux/memory.h> +#include <linux/mutex.h> #include <asm/bug.h> #include <asm/patch.h> @@ -33,7 +35,9 @@ void arch_jump_label_transform(struct jump_entry *entry, insn = RISCV_INSN_NOP; } + mutex_lock(&text_mutex); patch_text_nosync(addr, &insn, sizeof(insn)); + mutex_unlock(&text_mutex); } void arch_jump_label_transform_static(struct jump_entry *entry, -- 2.27.0
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