linux-kernel - Re: [PATCH part2 3/4] acpi: Remove "continue" in macro INVALID

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Message-ID: <1375970993.2424.142.camel@joe-AO722>
Date:	Thu, 08 Aug 2013 07:09:53 -0700
From:	Joe Perches <joe@...ches.com>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	robert.moore@...el.com, lv.zheng@...el.com, rjw@...k.pl,
	lenb@...nel.org, tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	akpm@...ux-foundation.org, tj@...nel.org, trenn@...e.de,
	yinghai@...nel.org, jiang.liu@...wei.com, wency@...fujitsu.com,
	laijs@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
	izumi.taku@...fujitsu.com, mgorman@...e.de, minchan@...nel.org,
	mina86@...a86.com, gong.chen@...ux.intel.com,
	vasilis.liaskovitis@...fitbricks.com, lwoodman@...hat.com,
	riel@...hat.com, jweiner@...hat.com, prarit@...hat.com,
	zhangyanfei@...fujitsu.com, yanghy@...fujitsu.com, x86@...nel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH part2 3/4] acpi: Remove "continue" in macro
 INVALID_TABLE().

On Thu, 2013-08-08 at 20:18 +0800, Tang Chen wrote:
> Hi Joe,

Hello Tang.

> On 08/08/2013 01:27 PM, Joe Perches wrote:
> > On Thu, 2013-08-08 at 13:03 +0800, Tang Chen wrote:
> >
> >> Change it to the style like other macros:
> >>
> >>   #define INVALID_TABLE(x, path, name)                                    \
> >>           do { pr_err("ACPI OVERRIDE: " x " [%s%s]\n", path, name); } while (0)
> >
> > Single statement macros do _not_ need to use
> > 	"do { foo(); } while (0)"
> > and should be written as
> > 	"foo()"
> 
> OK, will remove the do {} while (0).
> 
> But I think we'd better keep the macro, or rename it to something
> more meaningful. At least we can use it to avoid adding "ACPI OVERRIDE:"
> prefix every time. Maybe this is why it is defined.

No, it's just silly.

If you really think that the #define is better, use
something like HW_ERR does and embed that #define
in the pr_err.

#define ACPI_OVERRIDE	"ACPI OVERRIDE: "

	pr_err(ACPI_OVERRIDE "Table smaller than ACPI header [%s%s]\n",
	       cpio_path, file.name);

It's only used a few times by a single file so
I think it's unnecessary.

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