linux-kernel - [PATCH 2/2] x86: debug check for kmap_atomic_pfn and iomap_atomic_prot

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Message-ID: <20090311143449.GB22244@localhost.localdomain>
Date:	Wed, 11 Mar 2009 23:34:50 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: [PATCH 2/2] x86: debug check for kmap_atomic_pfn and
	iomap_atomic_prot_pfn()

It may be useful for kmap_atomic_pfn() and iomap_atomic_prot_pfn() to
check invalid kmap usage as well as kmap_atomic.

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: <x86@...nel.org>
---
 arch/x86/mm/highmem_32.c |    2 ++
 1 file changed, 2 insertions(+)

Index: 2.6-mmotm/arch/x86/mm/highmem_32.c
===================================================================
--- 2.6-mmotm.orig/arch/x86/mm/highmem_32.c
+++ 2.6-mmotm/arch/x86/mm/highmem_32.c
@@ -128,6 +128,8 @@ void *kmap_atomic_prot_pfn(unsigned long
 
 	pagefault_disable();
 
+	debug_kmap_atomic_prot(type);
+
 	idx = type + KM_TYPE_NR * smp_processor_id();
 	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
 	set_pte(kmap_pte - idx, pfn_pte(pfn, prot));
--
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