linux-kernel - Re: [PATCH] staging: android: Remove set but unused variable in ashmem.c

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Message-ID: <CAJuCfpF37KXw2SG37_XoRyhGWc+uueU0NaxcEfU1=FH-rRm+bQ@mail.gmail.com>
Date:   Fri, 23 Jul 2021 13:14:46 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Christian Brauner <christian@...uner.io>,
        Hridya Valsaraju <hridya@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-staging@...ts.linux.dev
Subject: Re: [PATCH] staging: android: Remove set but unused variable in ashmem.c

On Fri, Jul 23, 2021 at 1:05 PM Fabio M. De Francesco
<fmdefrancesco@...il.com> wrote:
>
> Remove variable 'inode' tnat is set but unused. Issue detected
> by building with warning option -Wunused-but-set-variable.
>
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
> ---
>  drivers/staging/android/ashmem.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
> index ddbde3f8430e..606e988d3f63 100644
> --- a/drivers/staging/android/ashmem.c
> +++ b/drivers/staging/android/ashmem.c
> @@ -406,7 +406,6 @@ static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
>         if (!asma->file) {
>                 char *name = ASHMEM_NAME_DEF;
>                 struct file *vmfile;
> -               struct inode *inode;
>
>                 if (asma->name[ASHMEM_NAME_PREFIX_LEN] != '\0')
>                         name = asma->name;
> @@ -418,7 +417,6 @@ static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
>                         goto out;
>                 }
>                 vmfile->f_mode |= FMODE_LSEEK;
> -               inode = file_inode(vmfile);
>                 lockdep_set_class(&inode->i_rwsem, &backing_shmem_inode_class);

How about its usage in the above lockdep_set_class(&inode->i_rwsem,
...) call? I'm guessing you are building with CONFIG_LOCKDEP=n.
Have you tried adding __maybe_unused in inode variable definition to
get rid of the warning?


>                 asma->file = vmfile;
>                 /*
> --
> 2.32.0
>