6.12-stable review patch. If anyone has any objections, please let me know.
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From: Tiezhu Yang yangtiezhu@loongson.cn
commit 12614f794274f63fbdfe76771b2b332077d63848 upstream.
arch_uprobe_skip_sstep() returns true if instruction was emulated, that is to say, there is no need to single step for the emulated instructions. regs->csr_era will point to the destination address directly after the exception, so the resume_era related code is redundant, just remove them.
Cc: stable@vger.kernel.org Fixes: 19bc6cb64092 ("LoongArch: Add uprobes support") Signed-off-by: Tiezhu Yang yangtiezhu@loongson.cn Signed-off-by: Huacai Chen chenhuacai@loongson.cn Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/loongarch/include/asm/uprobes.h | 1 - arch/loongarch/kernel/uprobes.c | 7 +------ 2 files changed, 1 insertion(+), 7 deletions(-)
--- a/arch/loongarch/include/asm/uprobes.h +++ b/arch/loongarch/include/asm/uprobes.h @@ -15,7 +15,6 @@ typedef u32 uprobe_opcode_t; #define UPROBE_XOLBP_INSN __emit_break(BRK_UPROBE_XOLBP)
struct arch_uprobe { - unsigned long resume_era; u32 insn[2]; u32 ixol[2]; bool simulate; --- a/arch/loongarch/kernel/uprobes.c +++ b/arch/loongarch/kernel/uprobes.c @@ -52,11 +52,7 @@ int arch_uprobe_post_xol(struct arch_upr
WARN_ON_ONCE(current->thread.trap_nr != UPROBE_TRAP_NR); current->thread.trap_nr = utask->autask.saved_trap_nr; - - if (auprobe->simulate) - instruction_pointer_set(regs, auprobe->resume_era); - else - instruction_pointer_set(regs, utask->vaddr + LOONGARCH_INSN_SIZE); + instruction_pointer_set(regs, utask->vaddr + LOONGARCH_INSN_SIZE);
return 0; } @@ -86,7 +82,6 @@ bool arch_uprobe_skip_sstep(struct arch_
insn.word = auprobe->insn[0]; arch_simulate_insn(insn, regs); - auprobe->resume_era = regs->csr_era;
return true; }