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mm: vmalloc use mutex for purge 

The vmalloc purge lock can be a mutex so we can sleep while a purge is
going on (purge involves a global kernel TLB invalidate, so it can take
quite a while).

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Nick Piggin 2009-01-06 14:39:19 -08:00 committed by Linus Torvalds
parent 8487784833
commit e97a630eb0
1 changed files with 5 additions and 4 deletions
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9
mm/vmalloc.c
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@ -14,6 +14,7 @@
#include <linux/highmem.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
@ -473,7 +474,7 @@ static atomic_t vmap_lazy_nr = ATOMIC_INIT(0);
static void __purge_vmap_area_lazy(unsigned long *start, unsigned long *end,
int sync, int force_flush)
{
static DEFINE_SPINLOCK(purge_lock);
static DEFINE_MUTEX(purge_lock);
LIST_HEAD(valist);
struct vmap_area *va;
int nr = 0;
@ -484,10 +485,10 @@ static void __purge_vmap_area_lazy(unsigned long *start, unsigned long *end,
* the case that isn't actually used at the moment anyway.
*/
if (!sync && !force_flush) {
if (!spin_trylock(&purge_lock))
if (!mutex_trylock(&purge_lock))
return;
} else
spin_lock(&purge_lock);
mutex_lock(&purge_lock);
rcu_read_lock();
list_for_each_entry_rcu(va, &vmap_area_list, list) {
@ -519,7 +520,7 @@ static void __purge_vmap_area_lazy(unsigned long *start, unsigned long *end,
__free_vmap_area(va);
spin_unlock(&vmap_area_lock);
}
spin_unlock(&purge_lock);
mutex_unlock(&purge_lock);
}
/*