linux-kernel - Re: [PATCH] asm-arm/{arch-omap,arch-ixp23xx}: parentheses around NR

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Date:	Thu, 29 Nov 2007 11:26:11 +0100
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	Roel Kluin <12o3l@...cali.nl>
Cc:	lkml <linux-kernel@...r.kernel.org>, kernel@...tstofly.org
Subject: Re: [PATCH] asm-arm/{arch-omap,arch-ixp23xx}: parentheses around NR_IRQS definition

On Thu, Nov 29, 2007 at 02:07:06AM +0100, Roel Kluin wrote:

> in include/asm-arm/arch-omap/board-innovator.h:40
> #define NR_IRQS    IH_BOARD_BASE + NR_FPGA_IRQS
> 
> in include/asm-arm/arch-ixp23xx/irqs.h:156:
> #define NR_IRQS      NR_IXP23XX_IRQS + NR_IXP23XX_MACH_IRQS
> 
> This could lead to problems when this definition is used in:
> 
> arch/ia64/sn/kernel/irq.c:516:
> sn_irq_lh = kmalloc(sizeof(struct list_head *) * NR_IRQS, GFP_KERNEL);
> arch/x86/kernel/io_apic_32.c:693:
> irq_cpu_data[i].irq_delta = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
> 694:
> irq_cpu_data[i].last_irq = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
> 699:
> memset(irq_cpu_data[i].irq_delta,0,sizeof(unsigned long) * NR_IRQS);
> 700:
> memset(irq_cpu_data[i].last_irq,0,sizeof(unsigned long) * NR_IRQS);
> fs/proc/proc_misc.c:464:
> per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
> 
> I am not sure whether this definition actually is used in any of these files.
> Am I being paranoya? anyway, adding parentheses should be safe.
> --
> Add parentheses to prevent operator precedence errors
> 
> Signed-off-by: Roel Kluin <12o3l@...cali.nl>

Acked-by: Lennert Buytenhek <buytenh@...tstofly.org>

Please send to the ARM patch system.
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