linux-kernel - Re: [PATCH] scsi: consistent use of _

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Date:	Wed, 29 Jul 2009 16:37:36 +0000
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: consistent use of __u8 in scsi/scsi.h

On Wed, 2009-07-29 at 18:28 +0200, Sam Ravnborg wrote:
> On Wed, Jul 29, 2009 at 08:56:03AM -0500, James Bottomley wrote:
> > On Wed, 2009-07-29 at 14:11 +0300, Michael S. Tsirkin wrote:
> > > scsi/scsi.h is exported to userspace, so it should
> > > use __u8 instead of u8 as other userspace-visible headers do.
> > 
> > Actually, can we just put a hold on this until we decide what we're
> > doing with exporting include/scsi.
> > 
> > Arguments so far are
> > 
> >      1. Don't export and let glibc supply the headers (as it does now)
> >      2. Move headers to be exported to include/linux
> >      3. Take over include/scsi export from glibc: this will necessitate
> >         comparing our current headers and those of glibc and moving
> >         stuff around.
> 
> 2 + 3...
> Let include/scsi be kernel internal stuff.
> And have the exported headers in include/linux.

I don't quite understand what you're saying here.  I think 2 and 3 are
either/or options.  Either we move the exported files to include/linux
or we export from include/scsi.

I have to say I don't like option 2 because the breakage is visible to
user level programs (unless we can persuade glibc people to #include
<linux/scsi.h> in scsi/scsi.h).

> This is how net/ handle their headers.
> 
> I did a quick diff of the glibc provided scsi.h and kernel scsi.h.
> >From a quick look it seems that we have more in the kernel version
> than the glibc version - and no obvious conflicts.
> 
> But agree with Boaz that we should do this in one go.

James


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