diff options
| author | Anna-Maria Gleixner <anna-maria@linutronix.de> | 2016-11-17 21:35:39 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-11-23 01:34:42 +0300 |
| commit | 08ed487c819d285c3f6ceafd156094102acdfec2 (patch) | |
| tree | 8fef90deb0a85eb12d628d16b4a377dafd8eb427 /arch | |
| parent | e5355cd6e78c096b66c26de8c9e5680ddba71c1f (diff) | |
| download | linux-08ed487c819d285c3f6ceafd156094102acdfec2.tar.xz | |
x86/oprofile/nmi: Remove superfluous smp_function_call_single()
Since commit 1cf4f629d9d2 ("cpu/hotplug: Move online calls to
hotplugged cpu") the CPU_ONLINE and CPU_DOWN_PREPARE notifiers are
always run on the hot plugged CPU, and as of commit 3b9d6da67e11
("cpu/hotplug: Fix rollback during error-out in __cpu_disable()")
the CPU_DOWN_FAILED notifier also runs on the hot plugged CPU.
This patch converts the SMP functional calls into direct calls.
smp_call_function_single() executes the function with interrupts
disabled. This calling convention is preserved.
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Robert Richter <rric@kernel.org>
Cc: rt@linuxtronix.de
Cc: oprofile-list@lists.sf.net
Link: http://lkml.kernel.org/r/20161117183541.8588-19-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/oprofile/nmi_int.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c index 28c04123b6dd..c39172cd6c87 100644 --- a/arch/x86/oprofile/nmi_int.c +++ b/arch/x86/oprofile/nmi_int.c @@ -387,20 +387,24 @@ static void nmi_cpu_shutdown(void *dummy) nmi_cpu_restore_registers(msrs); } -static void nmi_cpu_up(void *dummy) +static void nmi_cpu_up(void) { + local_irq_disable(); if (nmi_enabled) - nmi_cpu_setup(dummy); + nmi_cpu_setup(NULL); if (ctr_running) - nmi_cpu_start(dummy); + nmi_cpu_start(NULL); + local_irq_enable(); } -static void nmi_cpu_down(void *dummy) +static void nmi_cpu_down(void) { + local_irq_disable(); if (ctr_running) - nmi_cpu_stop(dummy); + nmi_cpu_stop(NULL); if (nmi_enabled) - nmi_cpu_shutdown(dummy); + nmi_cpu_shutdown(NULL); + local_irq_enable(); } static int nmi_create_files(struct dentry *root) @@ -436,15 +440,13 @@ static int nmi_create_files(struct dentry *root) static int oprofile_cpu_notifier(struct notifier_block *b, unsigned long action, void *data) { - int cpu = (unsigned long)data; - switch (action & ~CPU_TASKS_FROZEN) { case CPU_DOWN_FAILED: case CPU_ONLINE: - smp_call_function_single(cpu, nmi_cpu_up, NULL, 0); + nmi_cpu_up(); break; case CPU_DOWN_PREPARE: - smp_call_function_single(cpu, nmi_cpu_down, NULL, 1); + nmi_cpu_down(); break; } return NOTIFY_DONE; |