6.6-stable review patch. If anyone has any objections, please let me know.
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From: Tiezhu Yang yangtiezhu@loongson.cn
commit 0b326b2371f94e798137cc1a3c5c2eef2bc69061 upstream.
When executing the "perf probe" and "perf stat" test cases about some cryptographic algorithm, the output shows that "Trace/breakpoint trap". This is because it uses the software singlestep breakpoint for uprobes on LoongArch, and no need to use the hardware singlestep. So just remove the related function call to user_{en,dis}able_single_step() for uprobes on LoongArch.
How to reproduce:
Please make sure CONFIG_UPROBE_EVENTS is set and openssl supports sm2 algorithm, then execute the following command.
cd tools/perf && make ./perf probe -x /usr/lib64/libcrypto.so BN_mod_mul_montgomery ./perf stat -e probe_libcrypto:BN_mod_mul_montgomery openssl speed sm2
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/kernel/uprobes.c | 4 ---- 1 file changed, 4 deletions(-)
--- a/arch/loongarch/kernel/uprobes.c +++ b/arch/loongarch/kernel/uprobes.c @@ -42,7 +42,6 @@ int arch_uprobe_pre_xol(struct arch_upro utask->autask.saved_trap_nr = current->thread.trap_nr; current->thread.trap_nr = UPROBE_TRAP_NR; instruction_pointer_set(regs, utask->xol_vaddr); - user_enable_single_step(current);
return 0; } @@ -59,8 +58,6 @@ int arch_uprobe_post_xol(struct arch_upr else instruction_pointer_set(regs, utask->vaddr + LOONGARCH_INSN_SIZE);
- user_disable_single_step(current); - return 0; }
@@ -70,7 +67,6 @@ void arch_uprobe_abort_xol(struct arch_u
current->thread.trap_nr = utask->autask.saved_trap_nr; instruction_pointer_set(regs, utask->vaddr); - user_disable_single_step(current); }
bool arch_uprobe_xol_was_trapped(struct task_struct *t)