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authorMasami Hiramatsu <mhiramat@redhat.com>2009-01-06 14:41:47 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 15:59:20 -0800
commit8e1144050e49dd4ef19c117dc5626f212cfe73cf (patch)
treeb7feb97dc6f341999fbcaf8b4964e7e660cf0317 /kernel/test_kprobes.c
parentbc2f70151fe7a117dbe8347edc5a877e749572a3 (diff)
downloadvexpress-lsk-8e1144050e49dd4ef19c117dc5626f212cfe73cf.tar.gz
kprobes: indirectly call kprobe_target
Call kprobe_target indirectly. This prevents gcc to unroll a noinline function in caller function. I ported patches which had been discussed on http://sources.redhat.com/bugzilla/show_bug.cgi?id=3542 Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: David Miller <davem@davemloft.net> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/test_kprobes.c')
-rw-r--r--kernel/test_kprobes.c21
1 files changed, 6 insertions, 15 deletions
diff --git a/kernel/test_kprobes.c b/kernel/test_kprobes.c
index 06b6395b45b..9c0127ead6a 100644
--- a/kernel/test_kprobes.c
+++ b/kernel/test_kprobes.c
@@ -22,21 +22,10 @@
static u32 rand1, preh_val, posth_val, jph_val;
static int errors, handler_errors, num_tests;
+static u32 (*target)(u32 value);
static noinline u32 kprobe_target(u32 value)
{
- /*
- * gcc ignores noinline on some architectures unless we stuff
- * sufficient lard into the function. The get_kprobe() here is
- * just for that.
- *
- * NOTE: We aren't concerned about the correctness of get_kprobe()
- * here; hence, this call is neither under !preempt nor with the
- * kprobe_mutex held. This is fine(tm)
- */
- if (get_kprobe((void *)0xdeadbeef))
- printk(KERN_INFO "Kprobe smoke test: probe on 0xdeadbeef!\n");
-
return (value / div_factor);
}
@@ -74,7 +63,7 @@ static int test_kprobe(void)
return ret;
}
- ret = kprobe_target(rand1);
+ ret = target(rand1);
unregister_kprobe(&kp);
if (preh_val == 0) {
@@ -121,7 +110,7 @@ static int test_jprobe(void)
return ret;
}
- ret = kprobe_target(rand1);
+ ret = target(rand1);
unregister_jprobe(&jp);
if (jph_val == 0) {
printk(KERN_ERR "Kprobe smoke test failed: "
@@ -177,7 +166,7 @@ static int test_kretprobe(void)
return ret;
}
- ret = kprobe_target(rand1);
+ ret = target(rand1);
unregister_kretprobe(&rp);
if (krph_val != rand1) {
printk(KERN_ERR "Kprobe smoke test failed: "
@@ -193,6 +182,8 @@ int init_test_probes(void)
{
int ret;
+ target = kprobe_target;
+
do {
rand1 = random32();
} while (rand1 <= div_factor);