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author | Paul Mundt <lethal@linux-sh.org> | 2008-09-08 09:15:55 (GMT) |
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committer | Paul Mundt <lethal@linux-sh.org> | 2008-09-08 09:15:55 (GMT) |
commit | 734db3770de03fbe9ae4e78519a7d1678189788c (patch) | |
tree | 592de33e308a1e318281d2af0eec1ce686c5557f /arch/sh/kernel/kprobes.c | |
parent | 247bc6d2ae3e2de08529977952c7d085f9d562d4 (diff) | |
download | linux-734db3770de03fbe9ae4e78519a7d1678189788c.tar.xz |
sh: kprobes: Fix up race against probe point removal.
Handle a corner case where another CPU or debugger removes the probe
point from underneath us.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/kprobes.c')
-rw-r--r-- | arch/sh/kernel/kprobes.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/sh/kernel/kprobes.c b/arch/sh/kernel/kprobes.c index f0e1c78..a478ba7 100644 --- a/arch/sh/kernel/kprobes.c +++ b/arch/sh/kernel/kprobes.c @@ -252,6 +252,17 @@ static int __kprobes kprobe_handler(struct pt_regs *regs) p = get_kprobe(addr); if (!p) { /* Not one of ours: let kernel handle it */ + if (*(kprobe_opcode_t *)addr != BREAKPOINT_INSTRUCTION) { + /* + * The breakpoint instruction was removed right + * after we hit it. Another cpu has removed + * either a probepoint or a debugger breakpoint + * at this address. In either case, no further + * handling of this interrupt is appropriate. + */ + ret = 1; + } + goto no_kprobe; } |