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mm/vmalloc.c: simplify /proc/vmallocinfo implementation

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Many seq_file helpers exist for simplifying implementation of virtual
files especially, for /proc nodes.  however, the helpers for iteration
over list_head are available but aren't adopted to implement
/proc/vmallocinfo currently.

Simplify /proc/vmallocinfo implementation by using existing seq_file
helpers.

Link: http://lkml.kernel.org/r/57FDF2E5.1000201@zoho.com
Signed-off-by: zijun_hu <zijun_hu@htc.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
zijun_hu 2016-12-12 16:42:17 -08:00 committed by Linus Torvalds
parent 29fac03bef
commit 3f5000693f
1 changed files with 5 additions and 22 deletions
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27
mm/vmalloc.c
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@ -2574,32 +2574,13 @@ void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
static void *s_start(struct seq_file *m, loff_t *pos)
__acquires(&vmap_area_lock)
{
loff_t n = *pos;
struct vmap_area *va;
spin_lock(&vmap_area_lock);
va = list_first_entry(&vmap_area_list, typeof(*va), list);
while (n > 0 && &va->list != &vmap_area_list) {
n--;
va = list_next_entry(va, list);
}
if (!n && &va->list != &vmap_area_list)
return va;
return NULL;
return seq_list_start(&vmap_area_list, *pos);
}
static void *s_next(struct seq_file *m, void *p, loff_t *pos)
{
struct vmap_area *va = p, *next;
++*pos;
next = list_next_entry(va, list);
if (&next->list != &vmap_area_list)
return next;
return NULL;
return seq_list_next(p, &vmap_area_list, pos);
}
static void s_stop(struct seq_file *m, void *p)
@ -2634,9 +2615,11 @@ static void show_numa_info(struct seq_file *m, struct vm_struct *v)
static int s_show(struct seq_file *m, void *p)
{
struct vmap_area *va = p;
struct vmap_area *va;
struct vm_struct *v;
va = list_entry(p, struct vmap_area, list);
/*
* s_show can encounter race with remove_vm_area, !VM_VM_AREA on
* behalf of vmap area is being tear down or vm_map_ram allocation.