From: Nick Piggin Date: Wed, 19 Nov 2008 23:36:33 +0000 (-0800) Subject: mm: vmalloc failure flush fix X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=496850e5f5a372029ceb2b35c811770a9bb073b6;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git 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: Nick Piggin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 46aab4dbf618..04f5e320e744 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -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)