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authorDavid S. Miller <davem@davemloft.net>2008-04-17 23:56:30 -0700
committerDavid S. Miller <davem@davemloft.net>2008-04-17 23:56:30 -0700
commit1e42198609d73ed1a9adcba2af275c24c2678420 (patch)
tree32fd4d9073bfc0f3909af8f9fb4bcff38951d01a /arch/x86/kernel/step.c
parent794eb6bf20ebf992c040ea831cd3a9c64b0c1f7a (diff)
parent4b119e21d0c66c22e8ca03df05d9de623d0eb50f (diff)
downloadop-kernel-dev-1e42198609d73ed1a9adcba2af275c24c2678420.zip
op-kernel-dev-1e42198609d73ed1a9adcba2af275c24c2678420.tar.gz
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'arch/x86/kernel/step.c')
-rw-r--r--arch/x86/kernel/step.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/x86/kernel/step.c b/arch/x86/kernel/step.c
index 9d406cd..071ff47 100644
--- a/arch/x86/kernel/step.c
+++ b/arch/x86/kernel/step.c
@@ -140,6 +140,9 @@ static int enable_single_step(struct task_struct *child)
*/
static void write_debugctlmsr(struct task_struct *child, unsigned long val)
{
+ if (child->thread.debugctlmsr == val)
+ return;
+
child->thread.debugctlmsr = val;
if (child != current)
@@ -165,11 +168,11 @@ static void enable_step(struct task_struct *child, bool block)
write_debugctlmsr(child,
child->thread.debugctlmsr | DEBUGCTLMSR_BTF);
} else {
- write_debugctlmsr(child,
- child->thread.debugctlmsr & ~DEBUGCTLMSR_BTF);
+ write_debugctlmsr(child,
+ child->thread.debugctlmsr & ~DEBUGCTLMSR_BTF);
- if (!child->thread.debugctlmsr)
- clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
+ if (!child->thread.debugctlmsr)
+ clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
}
}
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