[PATCH] mm/page_alloc: Remove redundant pcp->free_count initialization in per_cpu_pages_init()

[PATCH] mm/page_alloc: Remove redundant pcp->free_count initialization in per_cpu_pages_init()

[Ye Liu]

From: Ye Liu <liuye@kylinos.cn>

In per_cpu_pages_init(), pcp->free_count is explicitly initialized to 0,
but this is redundant because the entire struct is already zeroed by
memset(pcp, 0, sizeof(*pcp)).

Signed-off-by: Ye Liu <liuye@kylinos.cn>
---
 mm/page_alloc.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d1d037f97c5f..64872214bc7d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5946,7 +5946,6 @@ static void per_cpu_pages_init(struct per_cpu_pages *pcp, struct per_cpu_zonesta
 	pcp->high_min = BOOT_PAGESET_HIGH;
 	pcp->high_max = BOOT_PAGESET_HIGH;
 	pcp->batch = BOOT_PAGESET_BATCH;
-	pcp->free_count = 0;
 }
 
 static void __zone_set_pageset_high_and_batch(struct zone *zone, unsigned long high_min,
-- 
2.43.0

Re: [PATCH] mm/page_alloc: Remove redundant pcp->free_count initialization in per_cpu_pages_init()

[Brendan Jackman]

On Thu Aug 14, 2025 at 7:18 AM UTC, Ye Liu wrote:
> From: Ye Liu <liuye@kylinos.cn>
>
> In per_cpu_pages_init(), pcp->free_count is explicitly initialized to 0,
> but this is redundant because the entire struct is already zeroed by
> memset(pcp, 0, sizeof(*pcp)).
>
> Signed-off-by: Ye Liu <liuye@kylinos.cn>

[heroically,]

Reviewed-By: Brendan Jackman <jackmanb@google.com>

Re: [PATCH] mm/page_alloc: Remove redundant pcp->free_count initialization in per_cpu_pages_init()

[Johannes Weiner]

On Thu, Aug 14, 2025 at 03:18:28PM +0800, Ye Liu wrote:
> From: Ye Liu <liuye@kylinos.cn>
> 
> In per_cpu_pages_init(), pcp->free_count is explicitly initialized to 0,
> but this is redundant because the entire struct is already zeroed by
> memset(pcp, 0, sizeof(*pcp)).
> 
> Signed-off-by: Ye Liu <liuye@kylinos.cn>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>

Re: [PATCH] mm/page_alloc: Remove redundant pcp->free_count initialization in per_cpu_pages_init()

[Zi Yan]

On 14 Aug 2025, at 3:18, Ye Liu wrote:

> From: Ye Liu <liuye@kylinos.cn>
>
> In per_cpu_pages_init(), pcp->free_count is explicitly initialized to 0,
> but this is redundant because the entire struct is already zeroed by
> memset(pcp, 0, sizeof(*pcp)).
>
> Signed-off-by: Ye Liu <liuye@kylinos.cn>
> ---
>  mm/page_alloc.c | 1 -
>  1 file changed, 1 deletion(-)
>

Reviewed-by: Zi Yan <ziy@nvidia.com>

--
Best Regards,
Yan, Zi