linux-kernel - Re: [PATCH v2] fs/ntfs3: Use kcalloc/kmalloc

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Date:   Wed, 18 Aug 2021 02:43:59 +0300
From:   Kari Argillander <kari.argillander@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
        ntfs3@...ts.linux.dev, Christoph Hellwig <hch@....de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] fs/ntfs3: Use kcalloc/kmalloc_array over
 kzalloc/kmalloc

On Tue, Aug 17, 2021 at 04:12:08PM -0700, Joe Perches wrote:
> On 2021-08-17 12:38, Kari Argillander wrote:
> > Use kcalloc/kmalloc_array over kzalloc/kmalloc when we allocate array.
> > Checkpatch found these after we did not use our own defined allocation
> > wrappers.
> []
> > diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
> []
> > @@ -900,7 +900,7 @@ static ssize_t ntfs_compress_write(struct kiocb
> > *iocb, struct iov_iter *from)
> >  		return -EOPNOTSUPP;
> >  	}
> > 
> > -	pages = kmalloc(pages_per_frame * sizeof(struct page *), GFP_NOFS);
> > +	pages = kcalloc(pages_per_frame, sizeof(struct page *), GFP_NOFS);
> 
> This is not an exact transformation.
> This allocates zeroed memory.
> Use kmalloc_array here instead.

Yeah. Thank you so much. I actually use kmalloc_array, but mistakes were
made and this was result. Thank you for reviewing.