linux-kernel - Re: [PATCH 1/2] MIPS: PCI: ops-emma2rh: drop nonsensical db

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Message-ID: <20150714083029.GA25179@linux-mips.org>
Date:	Tue, 14 Jul 2015 10:30:30 +0200
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Paul Burton <paul.burton@...tec.com>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] MIPS: PCI: ops-emma2rh: drop nonsensical db_assert

On Mon, Jul 13, 2015 at 05:14:21PM +0100, Paul Burton wrote:

> The db_assert call checks whether the bus_num pointer is non-NULL, but
> does so after said pointer has been dereferenced by the assignment on
> the previous line. Thus the check is pointless & likely to have been
> optimised out by the compiler anyway. The check_args function is static
> & only ever called from the local file with bus_num being a pointer to
> an on-stack variable, so the check seems somewhat overzealous anyway.
> Simply remove it.

Thanks, applied.

Your patch btw. leaves the db_verify() macro as the sole caller of
db_assert() and db_verify() itself is unused and in fact, nothing
includes <asm/debug.h> anymore.  Removing <asm/debug.h> leaves
CONFIG_RUNTIME_DEBUG unused, so I'm removing that one, too.

  Ralf
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