linux-kernel - [tip:x86/mm] x86: debug check for kmap_atomic_pfn and iomap_atomic_prot

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Message-ID: <tip-12074fa1073013dd11f1cff41db018d5cff4ecd9@git.kernel.org>
Date:	Wed, 11 Mar 2009 16:54:35 GMT
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	akinobu.mita@...il.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:x86/mm] x86: debug check for kmap_atomic_pfn and iomap_atomic_prot_pfn()

Commit-ID:  12074fa1073013dd11f1cff41db018d5cff4ecd9
Gitweb:     http://git.kernel.org/tip/12074fa1073013dd11f1cff41db018d5cff4ecd9
Author:     "Akinobu Mita" <akinobu.mita@...il.com>
AuthorDate: Wed, 11 Mar 2009 23:34:50 +0900
Commit:     Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 11 Mar 2009 15:47:46 +0100

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>
LKML-Reference: <20090311143449.GB22244@...alhost.localdomain>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/mm/highmem_32.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c
index ae4c8da..f256e73 100644
--- a/arch/x86/mm/highmem_32.c
+++ b/arch/x86/mm/highmem_32.c
@@ -128,6 +128,8 @@ void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot)
 
 	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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