linux-kernel - Re: 2.6.23-rc6-mm1 panic (memory controller issue ?)

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Date:	Wed, 19 Sep 2007 11:54:50 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
cc:	Badari Pulavarty <pbadari@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, balbir@...ibm.com,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.23-rc6-mm1 panic (memory controller issue ?)

On Wed, 19 Sep 2007, Balbir Singh wrote:

> Yes, the whole code is very interesting. From add_to_page_cache()
> we call radix_tree_preload with __GFP_HIGHMEM cleared, but
> from __add_to_swap_cache(), we don't make any changes to the
> gfp_mask. radix_tree_preload() calls kmem_cache_alloc() and in slub
> there is a check
> 
>         BUG_ON(flags & GFP_SLAB_BUG_MASK);
> 
> So, I guess all our allocations should check against __GFP_DMA and
> __GFP_HIGHMEM. I'll review the code, test it and send a fix.

You need to use the proper mask from include/linux/gfp.h. Masking 
individual bits will create problems when we create new bits.

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