linux-kernel - [PATCH] arm64: mm: fault: replace the behavior of fault

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Message-ID: <20241214091937.203842-1-lsahn@ooseel.net>
Date: Sat, 14 Dec 2024 18:19:36 +0900
From: Leesoo Ahn <lsahn@...eel.net>
To: lsahn@...eel.net
Cc: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Ryan Roberts <ryan.roberts@....com>,
	Joey Gouly <joey.gouly@....com>,
	Mark Brown <broonie@...nel.org>,
	Ard Biesheuvel <ardb@...nel.org>,
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] arm64: mm: fault: replace the behavior of fault_info[18]

Replace the behavior of 18th element of fault_info with the 'fn' member to
do_sea(..) and 'name' to 'level -2 (translation table walk)' based on
the information[1] of the latest reference manual[2].

The information has described in the chapter, D24.2.40 of [2] and
DFSC[5:0] bit (stands for Data Fault Status Code).

[1]: Synchronous External abort on translation table walk, level -2
[2]: Arm Architecture Reference Manual, for A-profile architecture

Signed-off-by: Leesoo Ahn <lsahn@...eel.net>
---
 arch/arm64/mm/fault.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index ef63651099a9..b1c08289a5cc 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -863,7 +863,7 @@ static const struct fault_info fault_info[] = {
 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 3 permission fault"	},
 	{ do_sea,		SIGBUS,  BUS_OBJERR,	"synchronous external abort"	},
 	{ do_tag_check_fault,	SIGSEGV, SEGV_MTESERR,	"synchronous tag check fault"	},
-	{ do_bad,		SIGKILL, SI_KERNEL,	"unknown 18"			},
+	{ do_sea,		SIGKILL, SI_KERNEL,	"level -2 (translation table walk)"	},
 	{ do_sea,		SIGKILL, SI_KERNEL,	"level -1 (translation table walk)"	},
 	{ do_sea,		SIGKILL, SI_KERNEL,	"level 0 (translation table walk)"	},
 	{ do_sea,		SIGKILL, SI_KERNEL,	"level 1 (translation table walk)"	},
-- 
2.46.1