linux-kernel - Re: [PATCH] x86: Extend test_and_set_bit() test_and_clean_bit() to 64 bits in X86

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Message-ID: <20090514135747.GA7926@infradead.org>
Date:	Thu, 14 May 2009 09:57:47 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Sheng Yang <sheng@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm <linux-mm@...ck.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86: Extend test_and_set_bit() test_and_clean_bit() to
	64 bits in X86_64

On Wed, May 13, 2009 at 04:17:27PM +0800, Sheng Yang wrote:
> This fix 44/45 bit width memory can't boot up issue. The reason is
> free_bootmem_node()->mark_bootmem_node()->__free() use test_and_clean_bit() to
> clean node_bootmem_map, but for 44bits width address, the idx set bit 31 (43 -
> 12), which consider as a nagetive value for bts.

Should we really have different prototypes for these helpers on
different architectures?

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