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| author |   Peter Zijlstra <peterz@infradead.org> | 2020-09-02 15:26:00 +0200 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2020-09-04 15:12:56 +0200 |
| commit | 21d44be7b6ff4c254dc971e2c99d4082dd470afd (patch) | |
| tree | c430490b1d3ab9a4971e3e896bf3bf8d1dc8434f /arch/x86/kernel/hw_breakpoint.c | |
| parent | x86/debug: Remove aout_dump_debugregs() (diff) | |
| download | linux-dev-21d44be7b6ff4c254dc971e2c99d4082dd470afd.tar.xz linux-dev-21d44be7b6ff4c254dc971e2c99d4082dd470afd.zip | |
x86/debug: Simplify hw_breakpoint_handler()
This is called with interrupts disabled, there's no point in using
get_cpu() and per_cpu().
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20200902133201.292906672@infradead.org
Diffstat (limited to 'arch/x86/kernel/hw_breakpoint.c')
| -rw-r--r-- | arch/x86/kernel/hw_breakpoint.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c index ca9de59ffb87..7b7d9f23a9ad 100644 --- a/arch/x86/kernel/hw_breakpoint.c +++ b/arch/x86/kernel/hw_breakpoint.c @@ -487,7 +487,7 @@ EXPORT_SYMBOL_GPL(hw_breakpoint_restore); */ static int hw_breakpoint_handler(struct die_args *args) { - int i, cpu, rc = NOTIFY_STOP; + int i, rc = NOTIFY_STOP; struct perf_event *bp; unsigned long dr6; unsigned long *dr6_p; @@ -505,12 +505,10 @@ static int hw_breakpoint_handler(struct die_args *args) return NOTIFY_DONE; /* - * Assert that local interrupts are disabled * Reset the DRn bits in the virtualized register value. * The ptrace trigger routine will add in whatever is needed. */ current->thread.debugreg6 &= ~DR_TRAP_BITS; - cpu = get_cpu(); /* Handle all the breakpoints that were triggered */ for (i = 0; i < HBP_NUM; ++i) { @@ -525,7 +523,7 @@ static int hw_breakpoint_handler(struct die_args *args) */ rcu_read_lock(); - bp = per_cpu(bp_per_reg[i], cpu); + bp = this_cpu_read(bp_per_reg[i]); /* * Reset the 'i'th TRAP bit in dr6 to denote completion of * exception handling @@ -560,8 +558,6 @@ static int hw_breakpoint_handler(struct die_args *args) (dr6 & (~DR_TRAP_BITS))) rc = NOTIFY_DONE; - put_cpu(); - return rc; } |