linux-kernel - Re: 2.6.24-rc2-mm1 (memory hotplug x86

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Message-Id: <20071115005657.99856c28.akpm@linux-foundation.org>
Date:	Thu, 15 Nov 2007 00:56:57 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, apw@...dowen.org,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Subject: Re: 2.6.24-rc2-mm1 (memory hotplug x86_64/vmemmap  fix)

On Thu, 15 Nov 2007 13:29:19 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> Fixes for memory hotplug compile and .section handling.
> 
> This patch fixes following bugs
> ==
> WARNING: vmlinux.o(.text+0x1d07c): Section mismatch: reference to .init.text:f
> ind_e820_area (between 'init_memory_mapping' and 'arch_add_memory')
> WARNING: vmlinux.o(.text+0x946b5): Section mismatch: reference to .init.text:
> __alloc_bootmem_node (between 'vmemmap_alloc_block' and 'vmemmap_pgd_populate')
> 
> ERROR: "memory_add_physaddr_to_nid" [drivers/acpi/acpi_memhotplug.ko] undefined!
> make[1]: *** [__modpost
> ==
> 
> This patch does
>  1. export memory_add_physaddr_to_nid().
>  2. changes __init to __init_refok find_early_table_space() (x86/mm/init_64.c)
>  3. changes __init_refok to __meminit in mm/sparse.c (This is bug.)
>  4. add wrapper function to call bootmem allocator without warning.
> 
>  After seeing "3", I thought simple __init_refok is dangerous and decided to
>  add wrapper function to call bootmem, is this style acceptable ?

eek.

What I now need to do with this patch is

- Work out which patches in -mm it is actually fixing.

- If that is more than one patch then split this patch up into multiple ones.

- Stage the one or more fixup patches immediately after the patches which
  they are fixing (with appropriate names: foo-fix.patch fixes foo.patch)

And that's OK - it's what I do.  But if you already have some idea which
patch you're actually fixing then it really helps me if you can tell me
which one it was, please - there's no point in having me duplicate your
work.

Plus it does look like this is three patches in one (at least)...

Thanks.
-
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