linux-kernel - Re: [PATCH 1/1] fs/ubifs/super.c: replace seq_printf by seq

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Date:	Tue, 15 Jul 2014 13:59:32 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Richard Weinberger <richard.weinberger@...il.com>
Cc:	Fabian Frederick <fabf@...net.be>,
	LKML <linux-kernel@...r.kernel.org>,
	Artem Bityutskiy <dedekind1@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>
Subject: Re: [PATCH 1/1] fs/ubifs/super.c: replace seq_printf by seq_puts

On Tue, 15 Jul 2014 22:10:24 +0200 Richard Weinberger <richard.weinberger@...il.com> wrote:

> On Tue, Jul 15, 2014 at 9:26 PM, Fabian Frederick <fabf@...net.be> wrote:
> > Fix checkpatch warnings:
> > "WARNING: Prefer seq_puts to seq_printf"
> 
> Can you explain why seq_puts() is preferred over seq_printf()?

- puts is presumably faster

- puts doesn't go rogue if you accidentally pass it a "%".

- this patch actually made fs/ubifs/super.o 12 bytes smaller. 
  Perhaps because seq_printf() is a varargs function, forcing the
  caller to pass args on the stack instead of in registers.
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