Re: [PATCH] Fix: BK-Current doesn't compile w/o SCSI enabled

[Jens Axboe <axboe@suse.de>]

On Tue, Oct 29 2002, tytso@mit.edu wrote:
> 
> BK current doesn't compile without SCSI being enabled, since
> sg_scsi_ioctl() in drivers/block/scsi_ioctl.c is always being compiled,
> regardless of whether or not SCSI is present (since some non-SCSI
> devices now use this infrastructure).  Unfortunately, it makes reference
> to the COMMAND_SIZE() macro, which is defined in drivers/scsi/scsi.c,
> and that is NOT defined on non-SCSI build kernels.
> 
> The simplest solution to this problem seems to be move scsi_command_size
> from drivers/scsi/scsi.c to drivers/block/scsi_ioctl.c, where it is used
> (and since it is always compiled in, this shouldn't break anything on
> SCSI systems).
> 
> I'm a bit uneasy about the abstraction violation of moving the
> scsi_command_size array outside of the drivers/scsi tree, but that
> problem was introduced when the code in drivers/block/scsi_ioctl.c was
> moved out of the drivers/scsi tree, since drivers/block/scsi_ioctl.c
> already #includes ../scsi/scsi.h, so I haven't introduced a new layering
> violation.

I think the "violation" is ok, since the commandset they reference is
the same. So no problem there.

> Jens, do you agree this is the best way of fixing this issue?  If so,
> please push this change to Linus.  Thanks!!

I've already sent the very same patch to Linus earlier today,
bit-for-bit identical :-)

-- 
Jens Axboe