linux-toradex.git/include/linux/percpu.h, branch v2.6.26-rc5

per_cpu: fix DEFINE_PER_CPU_SHARED_ALIGNED for modules

2008-05-15T02:11:14+00:00

Current module loader lookups ".data.percpu" ELF section to perform
per_cpu relocation.  But DEFINE_PER_CPU_SHARED_ALIGNED() uses another
section (".data.percpu.shared_aligned"), currently only handled in
vmlinux.lds, not by module loader.

To correct this problem, instead of adding logic into module loader, or
using at build time a module.lds file for all arches to group
".data.percpu.shared_aligned" into ".data.percpu", just use ".data.percpu"
for modules.

Alignment requirements are correctly handled by ld and module loader.

Signed-off-by: Eric Dumazet 
Cc: Rusty Russell 
Cc: Fenghua Yu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Remove superfluous include of string.h from percpu.h

2008-04-29T15:06:04+00:00

There's nothing in percpu.h that requires an explicit inclusion of
string.h.

Signed-off-by: Robert P. J. Day 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

PERCPU : __percpu_alloc_mask() can dynamically size percpu_data storage

2008-02-06T18:41:04+00:00

Instead of allocating a fix sized array of NR_CPUS pointers for percpu_data,
we can use nr_cpu_ids, which is generally < NR_CPUS.

Signed-off-by: Eric Dumazet 
Cc: Christoph Lameter 
Cc: "David S. Miller" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ia64: use generic percpu

2008-01-30T22:27:58+00:00

ia64 has a special processor specific mapping that can be used to locate the
offset for the current per cpu area.

Cc: linux-ia64@vger.kernel.org
Signed-off-by: Mike Travis 
Acked-by: Tony Luck 
Signed-off-by: Ingo Molnar

percpu: move arch XX_PER_CPU_XX definitions into linux/percpu.h

2008-01-30T12:32:52+00:00

- Special consideration for IA64: Add the ability to specify
  arch specific per cpu flags

- remove .data.percpu attribute from DEFINE_PER_CPU for non-smp case.

The arch definitions are all the same. So move them into linux/percpu.h.

We cannot move DECLARE_PER_CPU since some include files just include
asm/percpu.h to avoid include recursion problems.

Cc: Rusty Russell 
Cc: Andi Kleen 
Signed-off-by: Christoph Lameter 
Signed-off-by: Mike Travis 
Signed-off-by: Thomas Gleixner 
Signed-off-by: Ingo Molnar

Remove unnecessary includes of spinlock.h under include/linux

2007-07-16T16:05:42+00:00

Remove the obviously unnecessary includes of  under the
include/linux/ directory, and fix the couple errors that are introduced as
a result of that.

Signed-off-by: Robert P. J. Day 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] x86-64: Account for module percpu space separately from kernel percpu

2007-05-02T17:27:11+00:00

Rather than using a single constant PERCPU_ENOUGH_ROOM, compute it as
the sum of kernel_percpu + PERCPU_MODULE_RESERVE.  This is now common
to all architectures; if an architecture wants to set
PERCPU_ENOUGH_ROOM to something special, then it may do so (ia64 is
the only one which does).

Signed-off-by: Jeremy Fitzhardinge 
Signed-off-by: Andi Kleen 
Cc: Rusty Russell 
Cc: Eric W. Biederman 
Cc: Andi Kleen

[PATCH] Fix typo in "syntax error if percpu macros are incorrectly used" patch

2006-10-06T15:53:41+00:00

Trivial typo fix in the "syntax error if percpu macros are incorrectly
used" patch.  I misspelled "identifier" in all places.  D'Oh!

Thanks to Dirk Mueller to point this out.

Signed-off-by: Jan Blunck 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] __percpu_alloc_mask() has to be __always_inline in UP case

2006-09-29T16:18:02+00:00

...  or we'll end up with cpu_online_map being evaluated on UP.  In
modules.  cpumask.h is very careful to avoid that, and for a very good
reason.  So should we...

PS: yes, it really triggers (on alpha).

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

[PATCH] CPU hotplug compatible alloc_percpu()

2006-09-26T15:48:47+00:00

This patch splits alloc_percpu() up into two phases.  Likewise for
free_percpu().  This allows clients to limit initial allocations to online
cpu's, and to populate or depopulate per-cpu data at run time as needed:

  struct my_struct *obj;

  /* initial allocation for online cpu's */
  obj = percpu_alloc(sizeof(struct my_struct), GFP_KERNEL);

  ...

  /* populate per-cpu data for cpu coming online */
  ptr = percpu_populate(obj, sizeof(struct my_struct), GFP_KERNEL, cpu);

  ...

  /* access per-cpu object */
  ptr = percpu_ptr(obj, smp_processor_id());

  ...

  /* depopulate per-cpu data for cpu going offline */
  percpu_depopulate(obj, cpu);

  ...

  /* final removal */
  percpu_free(obj);

Signed-off-by: Martin Peschke 
Cc: Paul Jackson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds