Commit 4d36e6f8 authored by Uladzislau Rezki (Sony)'s avatar Uladzislau Rezki (Sony) Committed by Linus Torvalds
Browse files

mm/vmalloc.c: convert vmap_lazy_nr to atomic_long_t 

vmap_lazy_nr variable has atomic_t type that is 4 bytes integer value on
both 32 and 64 bit systems.  lazy_max_pages() deals with "unsigned long"
that is 8 bytes on 64 bit system, thus vmap_lazy_nr should be 8 bytes on
64 bit as well.

Link: http://lkml.kernel.org/r/20190131162452.25879-1-urezki@gmail.com


Signed-off-by: default avatarUladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarWilliam Kucharski <william.kucharski@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Thomas Garnier <thgarnie@google.com>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sonymobile.com>
Cc: Joel Fernandes <joelaf@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 68571be9

mm/vmalloc.c

+10 −10
Original line number Diff line number Diff line
@@ -633,7 +633,7 @@ static unsigned long lazy_max_pages(void) 
	return log * (32UL * 1024 * 1024 / PAGE_SIZE);

}



static atomic_t vmap_lazy_nr = ATOMIC_INIT(0);

static atomic_long_t vmap_lazy_nr = ATOMIC_LONG_INIT(0);



/*

 * Serialize vmap purging.  There is no actual criticial section protected
@@ -651,7 +651,7 @@ static void purge_fragmented_blocks_allcpus(void); 
 */

void set_iounmap_nonlazy(void)

{

	atomic_set(&vmap_lazy_nr, lazy_max_pages()+1);

	atomic_long_set(&vmap_lazy_nr, lazy_max_pages()+1);

}



/*
@@ -659,10 +659,10 @@ void set_iounmap_nonlazy(void) 
 */

static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end)

{

	unsigned long resched_threshold;

	struct llist_node *valist;

	struct vmap_area *va;

	struct vmap_area *n_va;

	int resched_threshold;



	lockdep_assert_held(&vmap_purge_lock);
@@ -682,16 +682,16 @@ static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end) 
	}



	flush_tlb_kernel_range(start, end);

	resched_threshold = (int) lazy_max_pages() << 1;

	resched_threshold = lazy_max_pages() << 1;



	spin_lock(&vmap_area_lock);

	llist_for_each_entry_safe(va, n_va, valist, purge_list) {

		int nr = (va->va_end - va->va_start) >> PAGE_SHIFT;

		unsigned long nr = (va->va_end - va->va_start) >> PAGE_SHIFT;



		__free_vmap_area(va);

		atomic_sub(nr, &vmap_lazy_nr);

		atomic_long_sub(nr, &vmap_lazy_nr);



		if (atomic_read(&vmap_lazy_nr) < resched_threshold)

		if (atomic_long_read(&vmap_lazy_nr) < resched_threshold)

			cond_resched_lock(&vmap_area_lock);

	}

	spin_unlock(&vmap_area_lock);
@@ -728,10 +728,10 @@ static void purge_vmap_area_lazy(void) 
 */

static void free_vmap_area_noflush(struct vmap_area *va)

{

	int nr_lazy;

	unsigned long nr_lazy;



	nr_lazy = atomic_add_return((va->va_end - va->va_start) >> PAGE_SHIFT,

				    &vmap_lazy_nr);

	nr_lazy = atomic_long_add_return((va->va_end - va->va_start) >>

				PAGE_SHIFT, &vmap_lazy_nr);



	/* After this point, we may free va at any time */

	llist_add(&va->purge_list, &vmap_purge_list);

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