linux-kernel - Re: [PATCH 21/21] [PATCH] finish processor.h integration

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Message-ID: <20071218133818.GA9941@elte.hu>
Date:	Tue, 18 Dec 2007 14:38:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Glauber de Oliveira Costa <gcosta@...hat.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	glommer@...il.com, tglx@...utronix.de, ehabkost@...hat.com,
	jeremy@...p.org, avi@...ranet.com, anthony@...emonkey.ws,
	virtualization@...ts.linux-foundation.org, rusty@...tcorp.com.au,
	ak@...e.de, chrisw@...s-sol.org, rostedt@...dmis.org,
	hpa@...or.com, zach@...are.com, roland@...hat.com
Subject: Re: [PATCH 21/21] [PATCH] finish processor.h integration


* Ingo Molnar <mingo@...e.hu> wrote:

> > What's left in processor_32.h and processor_64.h cannot be cleanly 
> > integrated. However, it's just a couple of definitions. They are 
> > moved to processor.h around ifdefs, and the original files are 
> > deleted. Note that there's much less headers included in the final 
> > version.
> 
> and this patch breaks the build on the attached config, with:
> 
>    CC      arch/x86/mm/boot_ioremap_32.o
>  In file included from include/asm/fixmap_32.h:28,
>                   from include/asm/fixmap.h:2,
>                   from include/asm/pgtable_32.h:16,
>                   from include/asm/pgtable.h:2,
>                   from arch/x86/mm/boot_ioremap_32.c:21:
>  include/asm/acpi.h:159: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'acpi_fake_nodes'
>  make[1]: *** [arch/x86/mm/boot_ioremap_32.o] Error 1
>  make: *** [arch/x86/mm/boot_ioremap_32.o] Error 2

really, please do _much_ more careful unification. We unified two full 
architectures in .24-rc1 and there was _not a single regression_ due to 
that unification. Not a single build failure, not a single boot or 
runtime failure.

here the problem is apparently caused by your patch, a careless 
'unification' of include file sections. 32-bit had this:

-#include <asm/vm86.h>
-#include <asm/math_emu.h>
-#include <asm/segment.h>
-#include <asm/page.h>
-#include <asm/types.h>
-#include <asm/sigcontext.h>
-#include <asm/cpufeature.h>
-#include <asm/msr.h>
-#include <asm/system.h>
-#include <linux/threads.h>
-#include <linux/init.h>
-#include <asm/desc_defs.h>

64-bit had this:

-#include <asm/segment.h>
-#include <asm/page.h>
-#include <asm/types.h>
-#include <asm/sigcontext.h>
-#include <asm/cpufeature.h>
-#include <linux/threads.h>
-#include <asm/msr.h>
-#include <asm/current.h>
-#include <asm/system.h>
-#include <linux/personality.h>
-#include <asm/desc_defs.h>

and the 'unified' processor.h has:

+#include <asm/desc_defs.h>
+#include <asm/msr.h>
 #include <asm/page.h>
 #include <asm/percpu.h>
 #include <asm/system.h>
 #include <asm/percpu.h>
 #include <linux/cpumask.h>
 #include <linux/cache.h>
+#include <linux/personality.h>

Those are visible, _crutial_ differences totally unmentioned in the 
patch.

yes, our include file dependencies are a jungle, the differences between 
32-bit and 64-bit are arbitrary in 80% of the cases, but still there's 
no reason why this couldnt be done correctly. The patch below is a quick 
bandaid that adds the missing bits.

	Ingo

------------------>
Subject: x86: fix include file mess
From: Ingo Molnar <mingo@...e.hu>

fix include file mess.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 include/asm-x86/processor.h |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

Index: linux-x86.q/include/asm-x86/processor.h
===================================================================
--- linux-x86.q.orig/include/asm-x86/processor.h
+++ linux-x86.q/include/asm-x86/processor.h
@@ -6,15 +6,27 @@
 struct task_struct;
 struct mm_struct;
 
+#ifdef CONFIG_X86_32
+# include <asm/math_emu.h>
+# include <asm/vm86.h>
+#endif
+
+#include <asm/cpufeature.h>
+#include <asm/current.h>
 #include <asm/desc_defs.h>
 #include <asm/msr.h>
 #include <asm/page.h>
 #include <asm/percpu.h>
+#include <asm/segment.h>
+#include <asm/sigcontext.h>
 #include <asm/system.h>
-#include <asm/percpu.h>
-#include <linux/cpumask.h>
+#include <asm/types.h>
+
 #include <linux/cache.h>
+#include <linux/cpumask.h>
+#include <linux/init.h>
 #include <linux/personality.h>
+#include <linux/threads.h>
 
 /*
  * Default implementation of macro that returns current
--
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