linux-toradex.git/include/linux/smp.h, branch v2.6.27.27

Full conversion to early_initcall() interface, remove old interface

2008-07-26T19:00:04+00:00

A previous patch added the early_initcall(), to allow a cleaner hooking of
pre-SMP initcalls.  Now we remove the older interface, converting all
existing users to the new one.

[akpm@linux-foundation.org: cleanups]
[akpm@linux-foundation.org: build fix]
[kosaki.motohiro@jp.fujitsu.com: warning fix]
[kosaki.motohiro@jp.fujitsu.com: warning fix]
Signed-off-by: Eduard - Gabriel Munteanu 
Cc: Tom Zanussi 
Signed-off-by: KOSAKI Motohiro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

generic-ipi: fix s390 build bug

2008-07-04T09:26:40+00:00

forgot to remove #include  from linux/smp.h while
fixing the original s390 build bug.

Patch below fixes this build bug caused by header inclusion dependencies:

  CC      kernel/timer.o
In file included from include/linux/spinlock.h:87,
                 from include/linux/smp.h:11,
                 from include/linux/kernel_stat.h:4,
                 from kernel/timer.c:22:
include/asm/spinlock.h: In function '__raw_spin_lock':
include/asm/spinlock.h:69: error: implicit declaration of function 'smp_processor_id'

Signed-off-by: Heiko Carstens 
Signed-off-by: Ingo Molnar

on_each_cpu(): kill unused 'retry' parameter

2008-06-26T09:24:38+00:00

It's not even passed on to smp_call_function() anymore, since that
was removed. So kill it.

Acked-by: Jeremy Fitzhardinge 
Reviewed-by: Paul E. McKenney 
Signed-off-by: Jens Axboe

smp_call_function: get rid of the unused nonatomic/retry argument

2008-06-26T09:24:35+00:00

It's never used and the comments refer to nonatomic and retry
interchangably. So get rid of it.

Acked-by: Jeremy Fitzhardinge 
Signed-off-by: Jens Axboe

Add generic helpers for arch IPI function calls

2008-06-26T09:21:34+00:00

This adds kernel/smp.c which contains helpers for IPI function calls. In
addition to supporting the existing smp_call_function() in a more efficient
manner, it also adds a more scalable variant called smp_call_function_single()
for calling a given function on a single CPU only.

The core of this is based on the x86-64 patch from Nick Piggin, lots of
changes since then. "Alan D. Brunelle"  has
contributed lots of fixes and suggestions as well. Also thanks to
Paul E. McKenney  for reviewing RCU usage
and getting rid of the data allocation fallback deadlock.

Acked-by: Ingo Molnar 
Reviewed-by: Paul E. McKenney 
Signed-off-by: Jens Axboe

x86: optimize lock prefix switching to run less frequently

2008-01-30T12:33:17+00:00

On VMs implemented using JITs that cache translated code changing the lock
prefixes is a quite costly operation that forces the JIT to throw away and
retranslate a lot of code.

Previously a SMP kernel would rewrite the locks once for each CPU which
is quite unnecessary. This patch changes the code to never switch at boot in
 the normal case (SMP kernel booting with >1 CPU) or only once for SMP kernel
on UP.

This makes a significant difference in boot up performance on AMD SimNow!
Also I expect it to be a little faster on native systems too because a smp
switch does a lot of text_poke()s which each synchronize the pipeline.

v1->v2: Rename max_cpus
v1->v2: Fix off by one in UP check (Thomas Gleixner)

Signed-off-by: Andi Kleen 
Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner

KVM: fix !SMP build error

2007-11-09T21:39:38+00:00

fix a !SMP build error:

drivers/kvm/kvm_main.c: In function 'kvm_flush_remote_tlbs':
drivers/kvm/kvm_main.c:220: error: implicit declaration of function 'smp_call_function_mask'

(and also avoid unused function warning related to up_smp_call_function()
not making use of the 'func' parameter.)

Signed-off-by: Ingo Molnar

smp_call_function_single() should be a macro on UP

2007-07-17T21:39:19+00:00

... or we end up with header include order problems from hell.

E.g. on m68k this is 100% fatal - local_irq_enable() there
wants preempt_count(), which wants task_struct fields, which
we won't have when we are in smp.h pulled from sched.h.

Signed-off-by: Al Viro 
Signed-off-by: Linus Torvalds

SMP: Allow smp_call_function_single() to current cpu

2007-07-16T09:05:50+00:00

This removes the requirement for callers to get_cpu() to check in simple
cases.  This patch is for !CONFIG_SMP.

Cc: Andi Kleen 
Signed-off-by: Avi Kivity

Let smp_call_function_single return -EBUSY on UP

2007-05-17T12:23:04+00:00

All architectures that have an implementation of smp_call_function_single
let it return -EBUSY if it is asked to execute func on the current cpu.
(akpm: except for x86_64).  Therefore the UP version must always return
-EBUSY.

[akpm@linux-foundation.org: build fix]
Signed-off-by: Heiko Carstens 
Cc: Andi Kleen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds