path: root/arch/s390
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authorAnanth N Mavinakayanahalli <ananth@in.ibm.com>2007-05-08 00:34:16 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 11:15:19 -0700
commitbf8f6e5b3e51ee0c64c2d1350c70198ddc8ad3f7 (patch)
treec48ebb92f836cfac58465eacc9658fbc2bac4783 /arch/s390
parent4c4308cb93450989846ac49faeb6dab943e7657e (diff)
Kprobes: The ON/OFF knob thru debugfs
This patch provides a debugfs knob to turn kprobes on/off o A new file /debug/kprobes/enabled indicates if kprobes is enabled or not (default enabled) o Echoing 0 to this file will disarm all installed probes o Any new probe registration when disabled will register the probe but not arm it. A message will be printed out in such a case. o When a value 1 is echoed to the file, all probes (including ones registered in the intervening period) will be enabled o Unregistration will happen irrespective of whether probes are globally enabled or not. o Update Documentation/kprobes.txt to reflect these changes. While there also update the doc to make it current. We are also looking at providing sysrq key support to tie to the disabling feature provided by this patch. [akpm@linux-foundation.org: Use bool like a bool!] [akpm@linux-foundation.org: add printk facility levels] [cornelia.huck@de.ibm.com: Add the missing arch_trampoline_kprobe() for s390] Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by: Srinivasa DS <srinivasa@in.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/s390')
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index 9d0f0d09d47..e39333ae0fc 100644
--- a/arch/s390/kernel/kprobes.c
+++ b/arch/s390/kernel/kprobes.c
@@ -661,3 +661,10 @@ int __init arch_init_kprobes(void)
return register_kprobe(&trampoline_p);
+int __kprobes arch_trampoline_kprobe(struct kprobe *p)
+ if (p->addr == (kprobe_opcode_t *) & kretprobe_trampoline)
+ return 1;
+ return 0;