linux-kernel - Re: [git-pull -tip] x86: fix section mismatch warnings

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Date:	Fri, 17 Apr 2009 23:31:20 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Sam Ravnborg <sam@...nborg.org>, x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [git-pull -tip] x86: fix section mismatch warnings

On Fri, 2009-04-17 at 18:41 +0200, Ingo Molnar wrote:
> * Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:
> 
> > The following changes since commit 88dc4c8e38d64db32907e0bd605f8c1ec4c4d1bd:
> >   Ingo Molnar (1):
> >         Merge branch 'tracing/ftrace'
> > 
> > are available in the git repository at:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/jaswinder/linux-2.6-tip.git master
> > 
> > Jaswinder Singh Rajput (3):
> >       x86: mm/numa_32.c calculate_numa_remap_pages should use __init
> >       x86: apic/es7000_32.c find_unisys_acpi_oem_table and es7000_acpi_madt_oem_check should use __init
> >       x86: smpboot.c wakeup_secondary_cpu_via_nmi do not required __devinit
> 
> The commit logs lack analysis. The suggestions in the warnings are 
> advisory and can be wrong. Analysis explaining what happened, maybe 
> even when it happened, and what should be done about it to fix that 
> issue is needed in such changelogs.
> 
> The commits might be correct - or they might be bogus. The commit 
> logs dont give us any help in deciding that. I.e. if you did that 
> work, you should document it. If you _didnt_ do that analysis work, 
> you shouldnt send patches addressing these types of warnings.
> 

I was busy in another stuff, So I am sending analysis of first commit.
If you want you can apply this patch and ignore others :

[PATCH-tip] x86: mm/numa_32.c calculate_numa_remap_pages should use __init

calculate_numa_remap_pages() is called only by __init initmem_init()
further calculate_numa_remap_pages is calling:
	__init find_e820_area() and __init reserve_early()

So calculate_numa_remap_pages() should be __init calculate_numa_remap_pages().

Impact: fix Section mismatch warnings
 WARNING: arch/x86/built-in.o(.text+0x82ea3): Section mismatch in reference from the function calculate_numa_remap_pages() to the function .init.text:find_e820_area()
 The function calculate_numa_remap_pages() references
 the function __init find_e820_area().
 This is often because calculate_numa_remap_pages lacks a __init
 annotation or the annotation of find_e820_area is wrong.

 WARNING: arch/x86/built-in.o(.text+0x82f5f): Section mismatch in reference from the function calculate_numa_remap_pages() to the function .init.text:reserve_early()
 The function calculate_numa_remap_pages() references
 the function __init reserve_early().
 This is often because calculate_numa_remap_pages lacks a __init
 annotation or the annotation of reserve_early is wrong.

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
---
 arch/x86/mm/numa_32.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/numa_32.c b/arch/x86/mm/numa_32.c
index 3daefa0..d253006 100644
--- a/arch/x86/mm/numa_32.c
+++ b/arch/x86/mm/numa_32.c
@@ -257,7 +257,7 @@ void resume_map_numa_kva(pgd_t *pgd_base)
 }
 #endif
 
-static unsigned long calculate_numa_remap_pages(void)
+static __init unsigned long calculate_numa_remap_pages(void)
 {
 	int nid;
 	unsigned long size, reserve_pages = 0;
-- 
1.6.0.6




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