[PATCH 2/2] x86: debug check for kmap_atomic_pfn and iomap_atomic_prot_pfn()

From: Akinobu Mita <akinobu.mita@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	x86@kernel.org
Subject: [PATCH 2/2] x86: debug check for kmap_atomic_pfn and iomap_atomic_prot_pfn()
Date: Wed, 11 Mar 2009 23:34:50 +0900	[thread overview]
Message-ID: <20090311143449.GB22244@localhost.localdomain> (raw)
In-Reply-To: <20090311143317.GA22244@localhost.localdomain>

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@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <x86@kernel.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));
