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mm: Extend gfp masking to the page allocator 

The page allocator also needs the masking of gfp flags during boot,
so this moves it out of slab/slub and uses it with the page allocator
as well.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Benjamin Herrenschmidt 2009-06-18 13:24:12 +10:00 committed by Linus Torvalds
parent 9729a6eb58
commit dcce284a25
5 changed files with 18 additions and 25 deletions
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9
include/linux/gfp.h
View File

@ -99,7 +99,7 @@ struct vm_area_struct;
__GFP_NORETRY|__GFP_NOMEMALLOC)
/* Control slab gfp mask during early boot */
#define SLAB_GFP_BOOT_MASK __GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)
#define GFP_BOOT_MASK __GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)
/* Control allocation constraints */
#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
@ -348,4 +348,11 @@ static inline void oom_killer_enable(void)
oom_killer_disabled = false;
}
extern gfp_t gfp_allowed_mask;
static inline void set_gfp_allowed_mask(gfp_t mask)
{
gfp_allowed_mask = mask;
}
#endif /* __LINUX_GFP_H */

4
init/main.c
View File

@ -642,6 +642,10 @@ asmlinkage void __init start_kernel(void)
"enabled early\n");
early_boot_irqs_on();
local_irq_enable();
/* Interrupts are enabled now so all GFP allocations are safe. */
set_gfp_allowed_mask(__GFP_BITS_MASK);
kmem_cache_init_late();
/*

3
mm/page_alloc.c
View File

@ -73,6 +73,7 @@ unsigned long totalram_pages __read_mostly;
unsigned long totalreserve_pages __read_mostly;
unsigned long highest_memmap_pfn __read_mostly;
int percpu_pagelist_fraction;
gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK;
#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
int pageblock_order __read_mostly;
@ -1863,6 +1864,8 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
struct page *page;
int migratetype = allocflags_to_migratetype(gfp_mask);
gfp_mask &= gfp_allowed_mask;
lockdep_trace_alloc(gfp_mask);
might_sleep_if(gfp_mask & __GFP_WAIT);

15
mm/slab.c
View File

@ -304,12 +304,6 @@ struct kmem_list3 {
int free_touched; /* updated without locking */
};
/*
* The slab allocator is initialized with interrupts disabled. Therefore, make
* sure early boot allocations don't accidentally enable interrupts.
*/
static gfp_t slab_gfp_mask __read_mostly = SLAB_GFP_BOOT_MASK;
/*
* Need this for bootstrapping a per node allocator.
*/
@ -1559,11 +1553,6 @@ void __init kmem_cache_init_late(void)
{
struct kmem_cache *cachep;
/*
* Interrupts are enabled now so all GFP allocations are safe.
*/
slab_gfp_mask = __GFP_BITS_MASK;
/* 6) resize the head arrays to their final sizes */
mutex_lock(&cache_chain_mutex);
list_for_each_entry(cachep, &cache_chain, next)
@ -3307,7 +3296,7 @@ __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
unsigned long save_flags;
void *ptr;
flags &= slab_gfp_mask;
flags &= gfp_allowed_mask;
lockdep_trace_alloc(flags);
@ -3392,7 +3381,7 @@ __cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller)
unsigned long save_flags;
void *objp;
flags &= slab_gfp_mask;
flags &= gfp_allowed_mask;
lockdep_trace_alloc(flags);

12
mm/slub.c
View File

@ -179,12 +179,6 @@ static enum {
SYSFS /* Sysfs up */
} slab_state = DOWN;
/*
* The slab allocator is initialized with interrupts disabled. Therefore, make
* sure early boot allocations don't accidentally enable interrupts.
*/
static gfp_t slab_gfp_mask __read_mostly = SLAB_GFP_BOOT_MASK;
/* A list of all slab caches on the system */
static DECLARE_RWSEM(slub_lock);
static LIST_HEAD(slab_caches);
@ -1692,7 +1686,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
unsigned long flags;
unsigned int objsize;
gfpflags &= slab_gfp_mask;
gfpflags &= gfp_allowed_mask;
lockdep_trace_alloc(gfpflags);
might_sleep_if(gfpflags & __GFP_WAIT);
@ -3220,10 +3214,6 @@ void __init kmem_cache_init(void)
void __init kmem_cache_init_late(void)
{
/*
* Interrupts are enabled now so all GFP allocations are safe.
*/
slab_gfp_mask = __GFP_BITS_MASK;
}
/*