linux-kernel - Re: [PATCH] [11/18] Fix alignment bug in bootmem allocator

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Message-ID: <86802c440803171427y7c9b2a54nacb0603916713033@mail.gmail.com>
Date:	Mon, 17 Mar 2008 14:27:21 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Andi Kleen" <andi@...stfloor.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Christoph Lameter" <clameter@....com>
Cc:	linux-kernel@...r.kernel.org, pj@....com, linux-mm@...ck.org,
	nickpiggin@...oo.com.au
Subject: Re: [PATCH] [11/18] Fix alignment bug in bootmem allocator

On Mon, Mar 17, 2008 at 11:52 AM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
> On Mon, Mar 17, 2008 at 1:56 AM, Andi Kleen <andi@...stfloor.org> wrote:
>  > > only happen when align is large than alignment of node_boot_start.
>  >
>  >  Here's an updated version of the patch with this addressed.
>  >  Please review. The patch is somewhat more complicated, but
>  >  actually makes the code a little cleaner now.
>  >
>  >  -Andi
>  >
>  >
>  >  Fix alignment bug in bootmem allocator
>  >
>  >
>  >  Without this fix bootmem can return unaligned addresses when the start of a
>  >  node is not aligned to the align value. Needed for reliably allocating
>  >  gigabyte pages.
>  >
>  >  I removed the offset variable because all tests should align themself correctly
>  >  now. Slight drawback might be that the bootmem allocator will spend
>  >  some more time skipping bits in the bitmap initially, but that shouldn't
>  >  be a big issue.
>  >
>  >
>  >  Signed-off-by: Andi Kleen <ak@...e.de>
>  >
>  how about create local node_boot_start and node_bootmem_map that make
>  sure node_boot_start has bigger alignment than align input.

please check it

YH

View attachment "offset_alloc_bootmem_v2.patch" of type "text/x-patch" (4834 bytes)