linux-kernel - Re: [akpm-mm:mm-unstable 26/98] fs/libfs.c:1231:47: warning: Local variable 'anon_aops' shadows outer variable [shadowVariable]

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Date:   Wed, 17 Aug 2022 10:10:45 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Kalesh Singh <kaleshsingh@...gle.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [akpm-mm:mm-unstable 26/98] fs/libfs.c:1231:47: warning: Local
 variable 'anon_aops' shadows outer variable [shadowVariable]

On Mon, 15 Aug 2022 23:36:43 +0800 kernel test robot <lkp@...el.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
> head:   d2af7b221349ff6241e25fa8c67bcfae2b360700
> commit: e4ab315810850b93cac381d6f4efd532f45a790e [26/98] procfs: add 'path' to /proc/<pid>/fdinfo/
> compiler: or1k-linux-gcc (GCC) 12.1.0
> reproduce (cppcheck warning):
>         # apt-get install cppcheck
>         git checkout e4ab315810850b93cac381d6f4efd532f45a790e
>         cppcheck --quiet --enable=style,performance,portability --template=gcc FILE
> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
> 
> cppcheck warnings: (new ones prefixed by >>)
> >> init/main.c:333:18: warning: Pointer addition with NULL pointer. [nullPointerArithmetic]
>     char *end = buf + size;
>                     ^
>    init/main.c:376:28: note: Calling function 'xbc_snprint_cmdline', 1st argument 'NULL' value is 0
>     len = xbc_snprint_cmdline(NULL, 0, root);
>                               ^
>    init/main.c:333:18: note: Null pointer addition
>     char *end = buf + size;

That's a pretty useless warning.

> >> fs/libfs.c:1231:47: warning: Local variable 'anon_aops' shadows outer variable [shadowVariable]
>     static const struct address_space_operations anon_aops = {
>                                                  ^
>    fs/libfs.c:1220:46: note: Shadowed declaration
>    static const struct address_space_operations anon_aops = {
>                                                 ^
>    fs/libfs.c:1231:47: note: Shadow variable
>     static const struct address_space_operations anon_aops = {

That's worth addressing.

--- a/fs/libfs.c~procfs-add-path-to-proc-pid-fdinfo-fix
+++ a/fs/libfs.c
@@ -1228,7 +1228,7 @@ bool is_anon_inode(struct inode *inode)
 
 struct inode *alloc_anon_inode(struct super_block *s)
 {
-	static const struct address_space_operations anon_aops = {
+	static const struct address_space_operations aops = {
 		.dirty_folio	= noop_dirty_folio,
 	};
 	struct inode *inode = new_inode_pseudo(s);
@@ -1237,7 +1237,7 @@ struct inode *alloc_anon_inode(struct su
 		return ERR_PTR(-ENOMEM);
 
 	inode->i_ino = get_next_ino();
-	inode->i_mapping->a_ops = &anon_aops;
+	inode->i_mapping->a_ops = &aops;
 
 	/*
 	 * Mark the inode dirty from the very beginning,
_