linux-toradex.git/include/linux/percpu.h, branch v2.6.36-rc5

percpu: handle __percpu notations in UP accessors

2010-08-07T12:20:53+00:00

UP accessors didn't take care of __percpu notations leading to a lot
of spurious sparse warnings on UP configurations.  Fix it.

Signed-off-by: Namhyung Kim 
Signed-off-by: Tejun Heo

percpu: allow limited allocation before slab is online

2010-06-27T16:50:00+00:00

This patch updates percpu allocator such that it can serve limited
amount of allocation before slab comes online.  This is primarily to
allow slab to depend on working percpu allocator.

Two parameters, PERCPU_DYNAMIC_EARLY_SIZE and SLOTS, determine how
much memory space and allocation map slots are reserved.  If this
reserved area is exhausted, WARN_ON_ONCE() will trigger and allocation
will fail till slab comes online.

The following changes are made to implement early alloc.

* pcpu_mem_alloc() now checks slab_is_available()

* Chunks are allocated using pcpu_mem_alloc()

* Init paths make sure ai->dyn_size is at least as large as
  PERCPU_DYNAMIC_EARLY_SIZE.

* Initial alloc maps are allocated in __initdata and copied to
  kmalloc'd areas once slab is online.

Signed-off-by: Tejun Heo 
Cc: Christoph Lameter

percpu: make @dyn_size always mean min dyn_size in first chunk init functions

2010-06-27T16:49:59+00:00

In pcpu_build_alloc_info() and pcpu_embed_first_chunk(), @dyn_size was
ssize_t, -1 meant auto-size, 0 forced 0 and positive meant minimum
size.  There's no use case for forcing 0 and the upcoming early alloc
support always requires non-zero dynamic size.  Make @dyn_size always
mean minimum dyn_size.

While at it, make pcpu_build_alloc_info() static which doesn't have
any external caller as suggested by David Rientjes.

Signed-off-by: Tejun Heo 
Cc: David Rientjes

Merge branch 'slabh' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc

2010-04-05T16:39:11+00:00

* 'slabh' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc:
  eeepc-wmi: include slab.h
  staging/otus: include slab.h from usbdrv.h
  percpu: don't implicitly include slab.h from percpu.h
  kmemcheck: Fix build errors due to missing slab.h
  include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
  iwlwifi: don't include iwl-dev.h from iwl-devtrace.h
  x86: don't include slab.h from arch/x86/include/asm/pgtable_32.h

Fix up trivial conflicts in include/linux/percpu.h due to
is_kernel_percpu_address() having been introduced since the slab.h
cleanup with the percpu_up.c splitup.

percpu: don't implicitly include slab.h from percpu.h

2010-03-30T13:02:32+00:00

percpu.h has always been including slab.h to get k[mz]alloc/free() for
UP inline implementation.  percpu.h being used by very low level
headers including module.h and sched.h, this meant that a lot files
unintentionally got slab.h inclusion.

Lee Schermerhorn was trying to make topology.h use percpu.h and got
bitten by this implicit inclusion.  The right thing to do is break
this ultimately unnecessary dependency.  The previous patch added
explicit inclusion of either gfp.h or slab.h to the source files using
them.  This patch updates percpu.h such that slab.h is no longer
included from percpu.h.

Signed-off-by: Tejun Heo 
Reviewed-by: Christoph Lameter 
Cc: Ingo Molnar 
Cc: Lee Schermerhorn

percpu, module: implement and use is_kernel/module_percpu_address()

2010-03-29T14:07:12+00:00

lockdep has custom code to check whether a pointer belongs to static
percpu area which is somewhat broken.  Implement proper
is_kernel/module_percpu_address() and replace the custom code.

On UP, percpu variables are regular static variables and can't be
distinguished from them.  Always return %false on UP.

Signed-off-by: Tejun Heo 
Acked-by: Peter Zijlstra 
Cc: Rusty Russell 
Cc: Ingo Molnar

Merge branch 'master' into percpu

2010-01-05T00:17:33+00:00

Conflicts:
	arch/powerpc/platforms/pseries/hvCall.S
	include/linux/percpu.h

Merge branch 'for-linus' into for-next

2009-12-08T01:02:12+00:00

Conflicts:
	mm/percpu.c

percpu: add missing per_cpu_ptr_to_phys() definition for UP

2009-12-01T23:36:58+00:00

Commit 3b034b0d084221596bf35c8d893e1d4d5477b9cc implemented
per_cpu_ptr_to_phys() but forgot to add UP definition.  Add UP
definition which is simple wrapper around __pa().

Signed-off-by: Tejun Heo 
Cc: Vivek Goyal 
Reported-by: Randy Dunlap

percpu: Fix kdump failure if booted with percpu_alloc=page

2009-11-25T12:49:22+00:00

o kdump functionality reserves a per cpu area at boot time and exports the
  physical address of that area to user space through sys interface. This
  area stores some dump related information like cpu register states etc
  at the time of crash.

o We were assuming that per cpu area always come from linearly mapped meory
  region and using __pa() to determine physical address.
  With percpu_alloc=page, per cpu area can come from vmalloc region also and
  __pa() breaks.

o This patch implments a new function to convert per cpu address to
  physical address.

Before the patch, crash_notes addresses looked as follows.

cpu0 60fffff49800
cpu1 60fffff60800
cpu2 60fffff77800

These are bogus phsyical addresses.

After the patch, address are following.

cpu0 13eb44000
cpu1 13eb43000
cpu2 13eb42000
cpu3 13eb41000

These look fine. I got 4G of memory and /proc/iomem tell me following.

100000000-13fffffff : System RAM

tj: * added missing asm/io.h include reported by Stephen Rothwell
    * repositioned per_cpu_ptr_phys() in percpu.c and added comment.

Signed-off-by: Vivek Goyal 
Signed-off-by: Tejun Heo 
Cc: Stephen Rothwell