linux-kernel - [PATCH] fault-inject: Enable stacktrace filter for x86-64

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Message-Id: <20221110113034.17563-1-jakub@cloudflare.com>
Date:   Thu, 10 Nov 2022 12:30:34 +0100
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     linux-kernel@...r.kernel.org
Cc:     kernel-team@...udflare.com, linux-kbuild@...r.kernel.org,
        x86@...nel.org, Akinobu Mita <akinobu.mita@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] fault-inject: Enable stacktrace filter for x86-64

Stacktrace filtering for fault injection has been disabled on x86-64 since
2007 due to the lack of a DWARF unwinder. See commit 6d690dcac92a ("fault
injection: disable stacktrace filter for x86-64").

In 2017, the ORC unwider, an alternative to DWARF unwinder has been added
in commit ee9f8fce9964 ("x86/unwind: Add the ORC unwinder").

We can now re-enable the stacktrace filter for x86-64.

Cc: linux-kbuild@...r.kernel.org
Cc: x86@...nel.org
Cc: Akinobu Mita <akinobu.mita@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
---
 lib/Kconfig.debug | 1 -
 1 file changed, 1 deletion(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 3fc7abffc7aa..32c5329b0dd9 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1963,7 +1963,6 @@ config FAIL_SUNRPC
 config FAULT_INJECTION_STACKTRACE_FILTER
 	bool "stacktrace filter for fault-injection capabilities"
 	depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
-	depends on !X86_64
 	select STACKTRACE
 	depends on FRAME_POINTER || MIPS || PPC || S390 || MICROBLAZE || ARM || ARC || X86
 	help
-- 
2.38.1