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Date:   Tue, 24 Nov 2020 15:12:44 +0100
From:   David Sterba <dave@jikos.cz>
To:     ira.weiny@intel.com
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Chris Mason <clm@fb.com>, Josef Bacik <josef@toxicpanda.com>,
        David Sterba <dsterba@suse.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Dave Hansen <dave.hansen@intel.com>,
        Matthew Wilcox <willy@infradead.org>,
        Christoph Hellwig <hch@infradead.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Eric Biggers <ebiggers@kernel.org>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Patrik Jakobsson <patrik.r.jakobsson@gmail.com>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        David Howells <dhowells@redhat.com>,
        Steve French <sfrench@samba.org>,
        Jaegeuk Kim <jaegeuk@kernel.org>, Chao Yu <yuchao0@huawei.com>,
        Nicolas Pitre <nico@fluxnic.net>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Brian King <brking@us.ibm.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        =?iso-8859-1?B?Suly9G1l?= Glisse <jglisse@redhat.com>,
        Kirti Wankhede <kwankhede@nvidia.com>,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 05/17] fs/btrfs: Convert to memzero_page()
Message-ID: <20201124141244.GE17322@twin.jikos.cz>
Reply-To: dave@jikos.cz
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        Andrew Morton <akpm@linux-foundation.org>, Chris Mason <clm@fb.com>,
        Josef Bacik <josef@toxicpanda.com>, David Sterba <dsterba@suse.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Dave Hansen <dave.hansen@intel.com>,
        Matthew Wilcox <willy@infradead.org>,
        Christoph Hellwig <hch@infradead.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Eric Biggers <ebiggers@kernel.org>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Patrik Jakobsson <patrik.r.jakobsson@gmail.com>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        David Howells <dhowells@redhat.com>,
        Steve French <sfrench@samba.org>, Jaegeuk Kim <jaegeuk@kernel.org>,
        Chao Yu <yuchao0@huawei.com>, Nicolas Pitre <nico@fluxnic.net>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Brian King <brking@us.ibm.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        =?iso-8859-1?B?Suly9G1l?= Glisse <jglisse@redhat.com>,
        Kirti Wankhede <kwankhede@nvidia.com>, linux-kernel@vger.kernel.org,
        linux-fsdevel@vger.kernel.org
References: <20201124060755.1405602-1-ira.weiny@intel.com>
 <20201124060755.1405602-6-ira.weiny@intel.com>
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On Mon, Nov 23, 2020 at 10:07:43PM -0800, ira.weiny@intel.com wrote:
> From: Ira Weiny <ira.weiny@intel.com>
> 
> Remove the kmap/memset()/kunmap pattern and use the new memzero_page()
> call where possible.
> 
> Cc: Chris Mason <clm@fb.com>
> Cc: Josef Bacik <josef@toxicpanda.com>
> Cc: David Sterba <dsterba@suse.com>
> Signed-off-by: Ira Weiny <ira.weiny@intel.com>
> ---
>  fs/btrfs/inode.c | 21 +++++----------------

The patch converts the pattern only in inode.c, but there's more in
compression.c, extent_io.c, zlib.c,d zstd.c (kmap_atomic) and reflink.c,
send.c (kmap).