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Date: Wed, 13 May 2015 16:52:16 +0800
From: Fam Zheng <famz@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH] iscsi: Remove pointless runtime check of
 macro value
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-trivial@nongnu.org, qemu-devel@nongnu.org

On Wed, 05/13 10:43, Paolo Bonzini wrote:
> 
> 
> On 13/05/2015 15:15, Fam Zheng wrote:
> > raw_bsd already has QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != 512), so iscsi
> > should relax.
> 
> It's okay to have the same QEMU_BUILD_BUG_ON in different places.
> However, you're right that this should be a compile-time check rather
> than run-time check.

I agree with you, but I can't imaging this value could ever change, so there is
little gain to duplicate in this case.

Fam

> 
> Paolo
> 
> > Signed-off-by: Fam Zheng <famz@redhat.com>
> > ---
> >  block/iscsi.c | 7 -------
> >  1 file changed, 7 deletions(-)
> > 
> > diff --git a/block/iscsi.c b/block/iscsi.c
> > index 8fca1d3..14e97a6 100644
> > --- a/block/iscsi.c
> > +++ b/block/iscsi.c
> > @@ -1323,13 +1323,6 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
> >      const char *filename;
> >      int i, ret = 0;
> >  
> > -    if ((BDRV_SECTOR_SIZE % 512) != 0) {
> > -        error_setg(errp, "iSCSI: Invalid BDRV_SECTOR_SIZE. "
> > -                   "BDRV_SECTOR_SIZE(%lld) is not a multiple "
> > -                   "of 512", BDRV_SECTOR_SIZE);
> > -        return -EINVAL;
> > -    }
> > -
> >      opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
> >      qemu_opts_absorb_qdict(opts, options, &local_err);
> >      if (local_err) {
> > 
>