[PATCH] mm, show_mem: drop pgdat_resize_lock in show_mem()

Wei Yang
2018-11-28T21:08:29Z

Function show_mem() is used to print system memory status when user
requires or fail to allocate memory. Generally, this is a best effort
information and not willing to affect core mm subsystem.

The data protected by pgdat_resize_lock is mostly correct except there is:

* page struct defer init
* memory hotplug

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
---
lib/show_mem.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/lib/show_mem.c b/lib/show_mem.c
index 0beaa1d899aa..1d996e5771ab 100644
--- a/lib/show_mem.c
+++ b/lib/show_mem.c
@@ -21,7 +21,6 @@ void show_mem(unsigned int filter, nodemask_t *nodemask)
unsigned long flags;
int zoneid;

- pgdat_resize_lock(pgdat, &flags);
for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {
struct zone *zone = &pgdat->node_zones[zoneid];
if (!populated_zone(zone))
@@ -33,7 +32,6 @@ void show_mem(unsigned int filter, nodemask_t *nodemask)
if (is_highmem_idx(zoneid))
highmem += zone->present_pages;
}
- pgdat_resize_unlock(pgdat, &flags);
}

printk("%lu pages RAM\n", total);
--
2.15.1