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s390/kprobes: Avoid stop machine if possible

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Avoid stop machine on kprobes arm/disarm when sequential instruction
fetching is present.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Vasily Gorbik
2024-08-28 19:06:52 +02:00
parent bb91ed0ee3
commit 30799152c3
1 changed files with 13 additions and 2 deletions
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15
arch/s390/kernel/kprobes.c
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@@ -21,6 +21,7 @@
#include <linux/hardirq.h>
#include <linux/ftrace.h>
#include <linux/execmem.h>
#include <asm/text-patching.h>
#include <asm/set_memory.h>
#include <asm/sections.h>
#include <asm/dis.h>
@@ -152,7 +153,12 @@ void arch_arm_kprobe(struct kprobe *p)
{
struct swap_insn_args args = {.p = p, .arm_kprobe = 1};
stop_machine_cpuslocked(swap_instruction, &args, NULL);
if (MACHINE_HAS_SEQ_INSN) {
swap_instruction(&args);
text_poke_sync();
} else {
stop_machine_cpuslocked(swap_instruction, &args, NULL);
}
}
NOKPROBE_SYMBOL(arch_arm_kprobe);
@@ -160,7 +166,12 @@ void arch_disarm_kprobe(struct kprobe *p)
{
struct swap_insn_args args = {.p = p, .arm_kprobe = 0};
stop_machine_cpuslocked(swap_instruction, &args, NULL);
if (MACHINE_HAS_SEQ_INSN) {
swap_instruction(&args);
text_poke_sync();
} else {
stop_machine_cpuslocked(swap_instruction, &args, NULL);
}
}
NOKPROBE_SYMBOL(arch_disarm_kprobe);