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| author | Alex Shi <alex.shi@linaro.org> | 2016-10-18 12:31:07 +0800 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2016-10-18 12:31:07 +0800 |
| commit | a66f9577c6e5280d83d45152aea29cf5e4548858 (patch) | |
| tree | ebb42fa6ef16a535adbd5acb8cc79bdd2980da24 /arch/arm64/kernel/debug-monitors.c | |
| parent | 26700159745df7db2bc75e8032d2a36913c37880 (diff) | |
| parent | 2308e34317c8cc7beb03a3d18dc39d32015eff06 (diff) | |
Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android
Diffstat (limited to 'arch/arm64/kernel/debug-monitors.c')
| -rw-r--r-- | arch/arm64/kernel/debug-monitors.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c index e51f27ac13fd..c8875b64be90 100644 --- a/arch/arm64/kernel/debug-monitors.c +++ b/arch/arm64/kernel/debug-monitors.c @@ -422,8 +422,10 @@ int kernel_active_single_step(void) /* ptrace API */ void user_enable_single_step(struct task_struct *task) { - set_ti_thread_flag(task_thread_info(task), TIF_SINGLESTEP); - set_regs_spsr_ss(task_pt_regs(task)); + struct thread_info *ti = task_thread_info(task); + + if (!test_and_set_ti_thread_flag(ti, TIF_SINGLESTEP)) + set_regs_spsr_ss(task_pt_regs(task)); } void user_disable_single_step(struct task_struct *task) |