aboutsummaryrefslogtreecommitdiffstats
path: root/arch/s390
diff options
context:
space:
mode:
authorMasami Hiramatsu <mhiramat@redhat.com>2009-01-06 17:41:50 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 18:59:20 -0500
commit129415607845d4daea11ddcba706005c69dcb942 (patch)
tree9046ea79a0b81c8823b9d42f00fd7c158861ed5c /arch/s390
parenta06f6211ef9b1785922f9d0e8766d63ac4e66de1 (diff)
kprobes: add kprobe_insn_mutex and cleanup arch_remove_kprobe()
Add kprobe_insn_mutex for protecting kprobe_insn_pages hlist, and remove kprobe_mutex from architecture dependent code. This allows us to call arch_remove_kprobe() (and free_insn_slot) while holding kprobe_mutex. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kernel/kprobes.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index 569079ec4ff0..9b92856632cf 100644
--- a/arch/s390/kernel/kprobes.c
+++ b/arch/s390/kernel/kprobes.c
@@ -218,9 +218,10 @@ void __kprobes arch_disarm_kprobe(struct kprobe *p)
218 218
219void __kprobes arch_remove_kprobe(struct kprobe *p) 219void __kprobes arch_remove_kprobe(struct kprobe *p)
220{ 220{
221 mutex_lock(&kprobe_mutex); 221 if (p->ainsn.insn) {
222 free_insn_slot(p->ainsn.insn, 0); 222 free_insn_slot(p->ainsn.insn, 0);
223 mutex_unlock(&kprobe_mutex); 223 p->ainsn.insn = NULL;
224 }
224} 225}
225 226
226static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs) 227static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)