linux-kernel - Re: [PATCH][next] fsdax: remove redundant variable 'error'

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Message-ID: <20230621132839.rvu2pvhcizhbzmyf@quack3>
Date:   Wed, 21 Jun 2023 15:28:39 +0200
From:   Jan Kara <jack@...e.cz>
To:     Colin Ian King <colin.i.king@...il.com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, nvdimm@...ts.linux.dev,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] fsdax: remove redundant variable 'error'

On Wed 21-06-23 14:02:56, Colin Ian King wrote:
> The variable 'error' is being assigned a value that is never read,
> the assignment and the variable and redundant and can be removed.
> Cleans up clang scan build warning:
> 
> fs/dax.c:1880:10: warning: Although the value stored to 'error' is
> used in the enclosing expression, the value is never actually read
> from 'error' [deadcode.DeadStores]
> 
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>

Yeah, good spotting. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/dax.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/fs/dax.c b/fs/dax.c
> index 2ababb89918d..cb36c6746fc4 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -1830,7 +1830,6 @@ static vm_fault_t dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
>  	vm_fault_t ret = VM_FAULT_FALLBACK;
>  	pgoff_t max_pgoff;
>  	void *entry;
> -	int error;
>  
>  	if (vmf->flags & FAULT_FLAG_WRITE)
>  		iter.flags |= IOMAP_WRITE;
> @@ -1877,7 +1876,7 @@ static vm_fault_t dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
>  	}
>  
>  	iter.pos = (loff_t)xas.xa_index << PAGE_SHIFT;
> -	while ((error = iomap_iter(&iter, ops)) > 0) {
> +	while (iomap_iter(&iter, ops) > 0) {
>  		if (iomap_length(&iter) < PMD_SIZE)
>  			continue; /* actually breaks out of the loop */
>  
> -- 
> 2.39.2
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR