From: "mao, bibo" <bibo.mao@intel.com>
To: Andrew Morton <akpm@osdl.org>,
Masami Hiramatsu <hiramatu@sdl.hitachi.co.jp>,
Jim Keniston <jkenisto@us.ibm.com>,
"Keshavamurthy, Anil S" <anil.s.keshavamurthy@intel.com>,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
prasanna <prasanna@in.ibm.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
"systemtap@sources.redhat.com" <systemtap@sources.redhat.com>
Subject: [PATCH] kprobe cleanup for VM_MASK judgement
Date: Wed, 26 Apr 2006 17:56:26 +0800 [thread overview]
Message-ID: <1146045386.29367.8.camel@maobb.site> (raw)
Hi,
When trap happens in user space, kprobe_exceptions_notify() funtion will skip it.
This patch deletes some unnecessary code for VM_MASK judgement in eflags.
Signed-off-by: bibo, mao <bibo.mao@intel.com>
Thanks
bibo,mao
diff -Nruap 2.6.17-rc1-mm3.org/arch/i386/kernel/kprobes.c 2.6.17-rc1-mm3.new/arch/i386/kernel/kprobes.c
--- 2.6.17-rc1-mm3.org/arch/i386/kernel/kprobes.c 2006-04-26 15:52:24.000000000 +0800
+++ 2.6.17-rc1-mm3.new/arch/i386/kernel/kprobes.c 2006-04-26 16:25:38.000000000 +0800
@@ -242,10 +242,6 @@ static int __kprobes kprobe_handler(stru
kcb->kprobe_status = KPROBE_REENTER;
return 1;
} else {
- if (regs->eflags & VM_MASK) {
- /* We are in virtual-8086 mode. Return 0 */
- goto no_kprobe;
- }
if (*addr != BREAKPOINT_INSTRUCTION) {
/* The breakpoint instruction was removed by
* another cpu right after we hit, no further
@@ -265,11 +261,6 @@ static int __kprobes kprobe_handler(stru
p = get_kprobe(addr);
if (!p) {
- if (regs->eflags & VM_MASK) {
- /* We are in virtual-8086 mode. Return 0 */
- goto no_kprobe;
- }
-
if (*addr != BREAKPOINT_INSTRUCTION) {
/*
* The breakpoint instruction was removed right
next reply other threads:[~2006-04-26 9:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-26 9:56 mao, bibo [this message]
2006-04-26 16:43 ` [PATCH] kprobe cleanup for VM_MASK judgement Keshavamurthy Anil S
2006-04-26 17:57 ` Prasanna S Panchamukhi
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