linux-kernel - Re: [PATCH] mips: irq: Use DECLARE

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Message-ID: <20150521131429.GA8177@linux-mips.org>
Date:	Thu, 21 May 2015 15:14:29 +0200
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Joe Perches <joe@...ches.com>
Cc:	linux-mips <linux-mips@...ux-mips.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Gabor Juhos <juhosg@...nwrt.org>,
	Manuel Lauss <manuel.lauss@...glemail.com>,
	John Crispin <blogic@...nwrt.org>
Subject: Re: [PATCH] mips: irq: Use DECLARE_BITMAP

On Wed, May 20, 2015 at 05:44:54AM -0700, Joe Perches wrote:

> Use the generic mechanism to declare a bitmap instead of unsigned long.
> 
> This could fix an overwrite defect of whatever follows irq_map.
> 
> Not all "#define NR_IRQS <value>" are a multiple of BITS_PER_LONG so
> using DECLARE_BITMAP allocates the proper number of longs required
> for the possible bits.
> 
> For instance:
> 
> arch/mips/include/asm/mach-ath79/irq.h:#define NR_IRQS                  51
> arch/mips/include/asm/mach-db1x00/irq.h:#define NR_IRQS 152
> arch/mips/include/asm/mach-lantiq/falcon/irq.h:#define NR_IRQS 328

This only matters to user of the allocate_irqno() API and there is only
on such platform, the IP27 which fortunately uses a NR_IRQS value that
is a multiple of 64, so no impact.

Thanks anyway!

  Ralf
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