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mm: remove __vfree_deferred 

Fold __vfree_deferred into vfree_atomic, and call vfree_atomic early on
from vfree if called from interrupt context so that the extra low-level
helper can be avoided.

Link: https://lkml.kernel.org/r/20230121071051.1143058-4-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2023-01-21 08:10:44 +01:00 committed by Andrew Morton
parent f41f036b80
commit 01e2e8394a
1 changed files with 19 additions and 28 deletions
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47
mm/vmalloc.c
View File

@ -2754,20 +2754,6 @@ static void __vunmap(const void *addr, int deallocate_pages)
kfree(area);
}
static inline void __vfree_deferred(const void *addr)
{
/*
* Use raw_cpu_ptr() because this can be called from preemptible
* context. Preemption is absolutely fine here, because the llist_add()
* implementation is lockless, so it works even if we are adding to
* another cpu's list. schedule_work() should be fine with this too.
*/
struct vfree_deferred *p = raw_cpu_ptr(&vfree_deferred);
if (llist_add((struct llist_node *)addr, &p->list))
schedule_work(&p->wq);
}
/**
* vfree_atomic - release memory allocated by vmalloc()
* @addr: memory base address
@ -2777,13 +2763,19 @@ static inline void __vfree_deferred(const void *addr)
*/
void vfree_atomic(const void *addr)
{
BUG_ON(in_nmi());
struct vfree_deferred *p = raw_cpu_ptr(&vfree_deferred);
BUG_ON(in_nmi());
kmemleak_free(addr);
if (!addr)
return;
__vfree_deferred(addr);
/*
* Use raw_cpu_ptr() because this can be called from preemptible
* context. Preemption is absolutely fine here, because the llist_add()
* implementation is lockless, so it works even if we are adding to
* another cpu's list. schedule_work() should be fine with this too.
*/
if (addr && llist_add((struct llist_node *)addr, &p->list))
schedule_work(&p->wq);
}
/**
@ -2805,17 +2797,16 @@ void vfree_atomic(const void *addr)
*/
void vfree(const void *addr)
{
BUG_ON(in_nmi());
kmemleak_free(addr);
might_sleep_if(!in_interrupt());
if (!addr)
if (unlikely(in_interrupt())) {
vfree_atomic(addr);
return;
if (unlikely(in_interrupt()))
__vfree_deferred(addr);
else
}
BUG_ON(in_nmi());
kmemleak_free(addr);
might_sleep();
if (addr)
__vunmap(addr, 1);
}
EXPORT_SYMBOL(vfree);