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percpu: clean up percpu constants

Browse source 
Impact: cleaup

Make the following cleanups.

* There isn't much arch-specific about PERCPU_MODULE_RESERVE.  Always
  define it whether arch overrides PERCPU_ENOUGH_ROOM or not.

* blackfin overrides PERCPU_ENOUGH_ROOM to align static area size.  Do
  it by default.

* percpu allocation sizes doesn't have much to do with the page size.
  Don't use PAGE_SHIFT in their definition.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Tejun Heo 2009-03-06 14:33:58 +09:00
parent f254f3909e
commit 6a242909b0
2 changed files with 13 additions and 21 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
arch/blackfin/include/asm/percpu.h
View file

@ -3,14 +3,4 @@
#include <asm-generic/percpu.h>
#ifdef CONFIG_MODULES
#define PERCPU_MODULE_RESERVE 8192
#else
#define PERCPU_MODULE_RESERVE 0
#endif
#define PERCPU_ENOUGH_ROOM \
(ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \
PERCPU_MODULE_RESERVE)
#endif /* __ARCH_BLACKFIN_PERCPU__ */

22
include/linux/percpu.h
View file

@ -5,6 +5,7 @@
#include <linux/slab.h> /* For kmalloc() */
#include <linux/smp.h>
#include <linux/cpumask.h>
#include <linux/pfn.h>
#include <asm/percpu.h>
@ -52,17 +53,18 @@
#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
/* Enough to cover all DEFINE_PER_CPUs in kernel, including modules. */
#ifndef PERCPU_ENOUGH_ROOM
/* enough to cover all DEFINE_PER_CPUs in modules */
#ifdef CONFIG_MODULES
#define PERCPU_MODULE_RESERVE 8192
#define PERCPU_MODULE_RESERVE (8 << 10)
#else
#define PERCPU_MODULE_RESERVE 0
#endif
#ifndef PERCPU_ENOUGH_ROOM
#define PERCPU_ENOUGH_ROOM \
(__per_cpu_end - __per_cpu_start + PERCPU_MODULE_RESERVE)
#endif /* PERCPU_ENOUGH_ROOM */
(ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \
PERCPU_MODULE_RESERVE)
#endif
/*
* Must be an lvalue. Since @var must be a simple identifier,
@ -79,7 +81,7 @@
#ifdef CONFIG_HAVE_DYNAMIC_PER_CPU_AREA
/* minimum unit size, also is the maximum supported allocation size */
#define PCPU_MIN_UNIT_SIZE (16UL << PAGE_SHIFT)
#define PCPU_MIN_UNIT_SIZE PFN_ALIGN(64 << 10)
/*
* PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy
@ -96,15 +98,15 @@
#ifndef PERCPU_DYNAMIC_RESERVE
# if BITS_PER_LONG > 32
# ifdef CONFIG_MODULES
# define PERCPU_DYNAMIC_RESERVE (6 << PAGE_SHIFT)
# define PERCPU_DYNAMIC_RESERVE (24 << 10)
# else
# define PERCPU_DYNAMIC_RESERVE (4 << PAGE_SHIFT)
# define PERCPU_DYNAMIC_RESERVE (16 << 10)
# endif
# else
# ifdef CONFIG_MODULES
# define PERCPU_DYNAMIC_RESERVE (4 << PAGE_SHIFT)
# define PERCPU_DYNAMIC_RESERVE (16 << 10)
# else
# define PERCPU_DYNAMIC_RESERVE (2 << PAGE_SHIFT)
# define PERCPU_DYNAMIC_RESERVE (8 << 10)
# endif
# endif
#endif /* PERCPU_DYNAMIC_RESERVE */