Re: [PATCH] virtio-blk: allow toggling host cache between writeback and writethrough

From: Rusty Russell <rusty@rustcorp.com.au>
To: Paolo Bonzini <pbonzini@redhat.com>, linux-kernel@vger.kernel.org
Cc: kvm@vger.kernel.org
Subject: Re: [PATCH] virtio-blk: allow toggling host cache between writeback and writethrough
Date: Wed, 04 Jul 2012 15:54:26 +0930	[thread overview]
Message-ID: <87y5n0ujqd.fsf@rustcorp.com.au> (raw)
In-Reply-To: <1341321577-24435-1-git-send-email-pbonzini@redhat.com>

On Tue,  3 Jul 2012 15:19:37 +0200, Paolo Bonzini <pbonzini@redhat.com> wrote:
> This patch adds support for the new VIRTIO_BLK_F_CONFIG_WCE feature,
> which exposes the cache mode in the configuration space and lets the
> driver modify it.  The cache mode is exposed via sysfs.
> 
> Even if the host does not support the new feature, the cache mode is
> visible (thanks to the existing VIRTIO_BLK_F_WCE), but not modifiable.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Fixed up some checkpatch warnings for you, too:

virtio:blk_allow_toggling_host_cache_between_writeback_and_writethrough.patch.new:51: WARNING: please, no spaces at the start of a line
#51: FILE: drivers/block/virtio_blk.c:424:
+       revalidate_disk(vblk->disk);$

.virtio:blk_allow_toggling_host_cache_between_writeback_and_writethrough.patch.new:54: WARNING: static const char * array should probably be static const char * const
#54: FILE: drivers/block/virtio_blk.c:427:
+static const char *virtblk_cache_types[] = {

.virtio:blk_allow_toggling_host_cache_between_writeback_and_writethrough.patch.new:160: ERROR: code indent should use tabs where possible
#160: FILE: include/linux/virtio_blk.h:73:
+        /* writeback mode (if VIRTIO_BLK_F_CONFIG_WCE) */$

.virtio:blk_allow_toggling_host_cache_between_writeback_and_writethrough.patch.new:161: ERROR: code indent should use tabs where possible
#161: FILE: include/linux/virtio_blk.h:74:
+        __u8 wce;$

.virtio:blk_allow_toggling_host_cache_between_writeback_and_writethrough.patch.new:161: WARNING: please, no spaces at the start of a line
#161: FILE: include/linux/virtio_blk.h:74:
+        __u8 wce;$

total: 2 errors, 3 warnings, 132 lines checked

Cheers,
Rusty.