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mm/vmalloc.c: change purge_ndoes as local static variable

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Patch series "mm/vmalloc.c: code cleanup and improvements", v2.

These changes were made from code inspection in mm/vmalloc.c.


This patch (of 5):

Static variable 'purge_ndoes' is defined in global scope, while it's only
used in function __purge_vmap_area_lazy().  It mainly serves to avoid
memory allocation repeatedly, especially when NR_CPUS is big.

While a local static variable can also satisfy the demand, and can improve
code readibility.  Hence move its definition into
__purge_vmap_area_lazy().

Link: https://lkml.kernel.org/r/20250418223653.243436-1-bhe@redhat.com
Link: https://lkml.kernel.org/r/20250418223653.243436-2-bhe@redhat.com
Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Reviewed-by: Shivank Garg <shivankg@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Baoquan He 2025-04-19 06:36:49 +08:00 committed by Andrew Morton
parent 786d5cc2b9
commit f7f68274e4
1 changed files with 1 additions and 1 deletions
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2
mm/vmalloc.c
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@ -2127,7 +2127,6 @@ static DEFINE_MUTEX(vmap_purge_lock);
/* for per-CPU blocks */
static void purge_fragmented_blocks_allcpus(void);
static cpumask_t purge_nodes;
static void
reclaim_list_global(struct list_head *head)
@ -2260,6 +2259,7 @@ static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end,
{
unsigned long nr_purged_areas = 0;
unsigned int nr_purge_helpers;
static cpumask_t purge_nodes;
unsigned int nr_purge_nodes;
struct vmap_node *vn;
int i;