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| author | David S. Miller <davem@davemloft.net> | 2008-04-18 10:56:30 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-04-18 10:56:30 +0400 |
| commit | 1e42198609d73ed1a9adcba2af275c24c2678420 (patch) | |
| tree | 32fd4d9073bfc0f3909af8f9fb4bcff38951d01a /arch/x86/kernel/step.c | |
| parent | 794eb6bf20ebf992c040ea831cd3a9c64b0c1f7a (diff) | |
| parent | 4b119e21d0c66c22e8ca03df05d9de623d0eb50f (diff) | |
| download | linux-1e42198609d73ed1a9adcba2af275c24c2678420.tar.xz | |
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.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/x86/kernel/step.c b/arch/x86/kernel/step.c index 9d406cdc847f..071ff4798236 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); } } |