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* Unable to understand a piece of code
@ 2019-05-20  0:07 Amit Kumar
  2019-05-20  1:23 ` Tobin C. Harding
  2019-05-22 17:57 ` Máté Eckl
  0 siblings, 2 replies; 4+ messages in thread
From: Amit Kumar @ 2019-05-20  0:07 UTC (permalink / raw)
  To: linux-newbie, Kernel Newbies

HI,

mm/slub.c: line 3973
int __kmem_cache_shrink(struct kmem_cache *s)
{
int node;
int i;
struct kmem_cache_node *n;
struct page *page;
struct page *t;
struct list_head discard;
struct list_head promote[SHRINK_PROMOTE_MAX];
unsigned long flags;
int ret = 0;

flush_all(s);
for_each_kmem_cache_node(s, node, n) {

How uninitialized variable node is being used in macro for_each_kmem_cache_node?

node is a local variable with no extern and not initialized.

mm/slab.h: line 490
#define for_each_kmem_cache_node(__s, __node, __n) \
for (__node = 0; __node < nr_node_ids; __node++) \
if ((__n = get_node(__s, __node)))

As we see for loop is based on node.

Thanks in advance.

Regards,
Amit Kumar

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2019-05-20  0:07 Unable to understand a piece of code Amit Kumar
2019-05-20  1:23 ` Tobin C. Harding
2019-05-20  3:33   ` Amit Kumar
2019-05-22 17:57 ` Máté Eckl

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