linux-kernel - Re: [PATCH v3 4/7] hugetlb: pass *next_nid_to_alloc directly to for_each_node_mask_to

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Date: Wed, 3 Jan 2024 10:22:46 +0800
From: Gang Li <gang.li@...ux.dev>
To: David Rientjes <rientjes@...gle.com>
Cc: David Hildenbrand <david@...hat.com>,
 Mike Kravetz <mike.kravetz@...cle.com>, Muchun Song <muchun.song@...ux.dev>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Tim Chen <tim.c.chen@...ux.intel.com>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, ligang.bdlg@...edance.com
Subject: Re: [PATCH v3 4/7] hugetlb: pass *next_nid_to_alloc directly to
 for_each_node_mask_to_alloc

On 2024/1/3 09:32, David Rientjes wrote:
> Same error as v2:
> 
> mm/hugetlb.c:3315:53: warning: variable 'node' is used uninitialized whenever '&&' condition is false [-Wsometimes-uninitialized]
>          for_each_node_mask_to_alloc(&h->next_nid_to_alloc, nr_nodes, node, &node_states[N_MEMORY]) {
>          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> mm/hugetlb.c:1501:3: note: expanded from macro 'for_each_node_mask_to_alloc'
>                  nr_nodes > 0 &&                                         \
>                  ^~~~~~~~~~~~
> mm/hugetlb.c:3342:38: note: uninitialized use occurs here
>          list_add(&m->list, &huge_boot_pages[node]);
>                                              ^~~~
> mm/hugetlb.c:3315:53: note: remove the '&&' if its condition is always true
>          for_each_node_mask_to_alloc(&h->next_nid_to_alloc, nr_nodes, node, &node_states[N_MEMORY]) {
>                                                             ^
> mm/hugetlb.c:3310:7: warning: variable 'node' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
>                  if (!m)
>                      ^~
> mm/hugetlb.c:3342:38: note: uninitialized use occurs here
>          list_add(&m->list, &huge_boot_pages[node]);
>                                              ^~~~
> mm/hugetlb.c:3310:3: note: remove the 'if' if its condition is always true
>                  if (!m)
>                  ^~~~~~~
> mm/hugetlb.c:3304:20: note: initialize the variable 'node' to silence this warning
>          int nr_nodes, node;
>                            ^
>                             = 0
> 2 warnings generated.
> 

How did you get those warnings? I got nothing in my compilation.