linux-kernel - Re: [PATCH v2] ARM: DMA: Fix kzalloc flags in __dma

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Message-ID: <20160318105833.GF19428@n2100.arm.linux.org.uk>
Date:	Fri, 18 Mar 2016 10:58:33 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Rabin Vincent <rabin@....in>,
	Thierry Reding <thierry.reding@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	gnurou@...il.com
Subject: Re: [PATCH v2] ARM: DMA: Fix kzalloc flags in __dma_alloc

On Fri, Mar 18, 2016 at 06:28:49PM +0900, Alexandre Courbot wrote:
> Commit 19e6e5e5392b ("ARM: 8547/1: dma-mapping: store buffer
> information") allocates a structure meant for internal buffer management
> with the GFP flags of the buffer itself. This can trigger the following
> safeguard in the slab/slub allocator:
> 
> 	if (unlikely(flags & GFP_SLAB_BUG_MASK)) {
> 		pr_emerg("gfp: %u\n", flags & GFP_SLAB_BUG_MASK);
> 		BUG();
> 	}
> 
> Fix this by filtering the flags that make the slab allocator unhappy.
> 
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> Cc: Rabin Vincent <rabin@....in>

Looks much better than the original.  Please send it to the patch system,
thanks.

-- 
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