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Commit 496850e5 authored by Nick Piggin's avatar Nick Piggin Committed by Linus Torvalds
Browse files

mm: vmalloc failure flush fix 



An initial vmalloc failure should start off a synchronous flush of lazy
areas, in case someone is in progress flushing them already, which could
cause us to return an allocation failure even if there is plenty of KVA
free.

Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f011c2da

mm/vmalloc.c

+13 −2
Original line number Diff line number Diff line
@@ -521,6 +521,17 @@ static void __purge_vmap_area_lazy(unsigned long *start, unsigned long *end, 
	spin_unlock(&purge_lock);

}



/*

 * Kick off a purge of the outstanding lazy areas. Don't bother if somebody

 * is already purging.

 */

static void try_purge_vmap_area_lazy(void)

{

	unsigned long start = ULONG_MAX, end = 0;



	__purge_vmap_area_lazy(&start, &end, 0, 0);

}



/*

 * Kick off a purge of the outstanding lazy areas.

 */
@@ -528,7 +539,7 @@ static void purge_vmap_area_lazy(void) 
{

	unsigned long start = ULONG_MAX, end = 0;



	__purge_vmap_area_lazy(&start, &end, 0, 0);

	__purge_vmap_area_lazy(&start, &end, 1, 0);

}



/*
@@ -539,7 +550,7 @@ static void free_unmap_vmap_area(struct vmap_area *va) 
	va->flags |= VM_LAZY_FREE;

	atomic_add((va->va_end - va->va_start) >> PAGE_SHIFT, &vmap_lazy_nr);

	if (unlikely(atomic_read(&vmap_lazy_nr) > lazy_max_pages()))

		purge_vmap_area_lazy();

		try_purge_vmap_area_lazy();

}



static struct vmap_area *find_vmap_area(unsigned long addr)