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mm/swapfile: do not sleep with a spin lock held

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We can't call kvfree() with a spin lock held, so defer it.  Fixes a
might_sleep() runtime warning.

Fixes: 873d7bcfd0 ("mm/swapfile.c: use kvzalloc for swap_info_struct allocation")
Signed-off-by: Qian Cai <qcai@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20201202151549.10350-1-qcai@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Qian Cai 2020-12-05 22:14:55 -08:00 committed by Linus Torvalds
parent e91d8d7823
commit b11a76b37a
1 changed files with 3 additions and 1 deletions
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4
mm/swapfile.c
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@ -2867,6 +2867,7 @@ late_initcall(max_swapfiles_check);
static struct swap_info_struct *alloc_swap_info(void) static struct swap_info_struct *alloc_swap_info(void)
{ {
struct swap_info_struct *p; struct swap_info_struct *p;
struct swap_info_struct *defer = NULL;
unsigned int type; unsigned int type;
int i; int i;
@ -2895,7 +2896,7 @@ static struct swap_info_struct *alloc_swap_info(void)
smp_wmb(); smp_wmb();
WRITE_ONCE(nr_swapfiles, nr_swapfiles + 1); WRITE_ONCE(nr_swapfiles, nr_swapfiles + 1);
} else { } else {
kvfree(p); defer = p;
p = swap_info[type]; p = swap_info[type];
/* /*
* Do not memset this entry: a racing procfs swap_next() * Do not memset this entry: a racing procfs swap_next()
@ -2908,6 +2909,7 @@ static struct swap_info_struct *alloc_swap_info(void)
plist_node_init(&p->avail_lists[i], 0); plist_node_init(&p->avail_lists[i], 0);
p->flags = SWP_USED; p->flags = SWP_USED;
spin_unlock(&swap_lock); spin_unlock(&swap_lock);
kvfree(defer);
spin_lock_init(&p->lock); spin_lock_init(&p->lock);
spin_lock_init(&p->cont_lock); spin_lock_init(&p->cont_lock);