linux-kernel - [PATCH] Handle instruction cache maintenance fault properly

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Message-ID: <AANLkTikIbI6hKoYSZlo6QDlyi2Qjxg287i-ilHpz1FF9@mail.gmail.com>
Date:	Mon, 10 May 2010 16:07:57 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Russell King <linux@....linux.org.uk>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Siarhei Siamashka <siarhei.siamashka@...ia.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Aaro Koskinen <aaro.koskinen@...ia.com>
Subject: [PATCH] Handle instruction cache maintenance fault properly

Between "clean D line..." and "invalidate I line" operations in
v7_coherent_user_range(), the memory page may get swapped out.
And the fault on "invalidate I line" could not be properly handled
causing the oops.

The patch adds the missing handling for "instruction cache
maintenance fault". Let's handle it as translation fault.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@...ia.com>
Signed-off-by: Kirill A. Shutemov <kirill@...temov.name>
---
 arch/arm/mm/fault.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index 9d40c34..8924617 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -463,7 +463,7 @@ static struct fsr_info {
 	{ do_bad,		SIGILL,	 BUS_ADRALN,	"alignment exception"		   },
 	{ do_bad,		SIGKILL, 0,		"terminal exception"		   },
 	{ do_bad,		SIGILL,	 BUS_ADRALN,	"alignment exception"		   },
-	{ do_bad,		SIGBUS,	 0,		"external abort on linefetch"	   },
+	{ do_translation_fault,	SIGSEGV, SEGV_MAPPER,	"I-cache maintenance
fault"	   },
 	{ do_translation_fault,	SIGSEGV, SEGV_MAPERR,	"section translation
fault"	   },
 	{ do_bad,		SIGBUS,	 0,		"external abort on linefetch"	   },
 	{ do_page_fault,	SIGSEGV, SEGV_MAPERR,	"page translation fault"	   },
-- 
1.7.0.4
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