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| author | Thomas Gleixner <tglx@linutronix.de> | 2012-04-20 13:05:44 +0000 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2012-04-26 12:06:09 +0200 |
| commit | 38498a67aa2cf8c80754b8d304bfacc10bc582b5 (patch) | |
| tree | 5d1d5ff7fd9b847454f9d5053ad0709ffb3cc32c /kernel | |
| parent | 8239c25f47d2b318156993b15f33900a86ea5e17 (diff) | |
| download | lwn-38498a67aa2cf8c80754b8d304bfacc10bc582b5.tar.gz lwn-38498a67aa2cf8c80754b8d304bfacc10bc582b5.zip | |
smp: Add generic smpboot facility
Start a new file, which will hold SMP and CPU hotplug related generic
infrastructure.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: David Howells <dhowells@redhat.com>
Cc: James E.J. Bottomley <jejb@parisc-linux.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: x86@kernel.org
Link: http://lkml.kernel.org/r/20120420124557.035417523@linutronix.de
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/Makefile | 1 | ||||
| -rw-r--r-- | kernel/cpu.c | 8 | ||||
| -rw-r--r-- | kernel/smpboot.c | 14 | ||||
| -rw-r--r-- | kernel/smpboot.h | 6 |
4 files changed, 29 insertions, 0 deletions
diff --git a/kernel/Makefile b/kernel/Makefile index cb41b9547c9f..6c07f30fa9b7 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -43,6 +43,7 @@ obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o obj-$(CONFIG_SMP) += smp.o +obj-$(CONFIG_SMP) += smpboot.o ifneq ($(CONFIG_SMP),y) obj-y += up.o endif diff --git a/kernel/cpu.c b/kernel/cpu.c index e711aef0fb3c..e58b99ada3d8 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -17,6 +17,8 @@ #include <linux/gfp.h> #include <linux/suspend.h> +#include "smpboot.h" + #ifdef CONFIG_SMP /* Serializes the updates to cpu_online_mask, cpu_present_mask */ static DEFINE_MUTEX(cpu_add_remove_lock); @@ -300,6 +302,11 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen) return -EINVAL; cpu_hotplug_begin(); + + ret = smpboot_prepare(cpu); + if (ret) + goto out; + ret = __cpu_notify(CPU_UP_PREPARE | mod, hcpu, -1, &nr_calls); if (ret) { nr_calls--; @@ -320,6 +327,7 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen) out_notify: if (ret != 0) __cpu_notify(CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL); +out: cpu_hotplug_done(); return ret; diff --git a/kernel/smpboot.c b/kernel/smpboot.c new file mode 100644 index 000000000000..6dae6a3d2d59 --- /dev/null +++ b/kernel/smpboot.c @@ -0,0 +1,14 @@ +/* + * Common SMP CPU bringup/teardown functions + */ +#include <linux/init.h> + +#include "smpboot.h" + +/** + * smpboot_prepare - generic smpboot preparation + */ +int __cpuinit smpboot_prepare(unsigned int cpu) +{ + return 0; +} diff --git a/kernel/smpboot.h b/kernel/smpboot.h new file mode 100644 index 000000000000..d88e77165086 --- /dev/null +++ b/kernel/smpboot.h @@ -0,0 +1,6 @@ +#ifndef SMPBOOT_H +#define SMPBOOT_H + +int smpboot_prepare(unsigned int cpu); + +#endif |