linux-kernel - [PATCH 1/4] x86: don't include slab.h from arch/x86/include/asm/pgtable

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Message-Id: <1269420538-18039-2-git-send-email-tj@kernel.org>
Date:	Wed, 24 Mar 2010 17:48:55 +0900
From:	Tejun Heo <tj@...nel.org>
To:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, Lee.Schermerhorn@...com,
	cl@...ux-foundation.org, mingo@...e.hu, adobriyan@...il.com,
	tglx@...utronix.de, hpa@...or.com, yi.zhu@...el.com,
	reinette.chatre@...el.com, ilw@...ux.intel.com
Cc:	Tejun Heo <tj@...nel.org>
Subject: [PATCH 1/4] x86: don't include slab.h from arch/x86/include/asm/pgtable_32.h

Including slab.h from x86 pgtable_32.h creates a troublesome
dependency chain w/ ftrace enabled.  The following chain leads to
inclusion of pgtable_32.h from define_trace.h.

 trace/define_trace.h
 trace/ftrace.h
 linux/ftrace_event.h
 linux/ring_buffer.h
 linux/mm.h
 asm/pgtable.h
 asm/pgtable_32.h

And when slab.h itself defines trace hooks via

 linux/sl[aou]b_def.h
 linux/kmemtrace.h
 trace/events/kmem.h

If slab.h is not included before define_trace.h is included, this
leads to duplicate definitions of kmemtrace hooks or other include
dependency problems.

pgtable_32.h doesn't need slab.h to begin with.  Don't include it from
there.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: H. Peter Anvin <hpa@...or.com>
---
 arch/x86/include/asm/pgtable_32.h |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/pgtable_32.h b/arch/x86/include/asm/pgtable_32.h
index 47339a1..2984a25 100644
--- a/arch/x86/include/asm/pgtable_32.h
+++ b/arch/x86/include/asm/pgtable_32.h
@@ -19,7 +19,6 @@
 #include <asm/paravirt.h>
 
 #include <linux/bitops.h>
-#include <linux/slab.h>
 #include <linux/list.h>
 #include <linux/spinlock.h>
 
-- 
1.6.4.2

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