linux-kernel - [PATCH AUTOSEL 5.4 07/12] ARM: 9320/1: fix stack depot IRQ stack filter

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Date:   Tue,  7 Nov 2023 10:53:25 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Sasha Levin <sashal@...nel.org>, linux@...linux.org.uk,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 07/12] ARM: 9320/1: fix stack depot IRQ stack filter

From: Vincent Whitchurch <vincent.whitchurch@...s.com>

[ Upstream commit b0150014878c32197cfa66e3e2f79e57f66babc0 ]

Place IRQ handlers such as gic_handle_irq() in the irqentry section even
if FUNCTION_GRAPH_TRACER is not enabled.  Without this, the stack
depot's filter_irq_stacks() does not correctly filter out IRQ stacks in
those configurations, which hampers deduplication and eventually leads
to "Stack depot reached limit capacity" splats with KASAN.

A similar fix was done for arm64 in commit f6794950f0e5ba37e3bbed
("arm64: set __exception_irq_entry with __irq_entry as a default").

Link: https://lore.kernel.org/r/20230803-arm-irqentry-v1-1-8aad8e260b1c@axis.com

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm/include/asm/exception.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/arm/include/asm/exception.h b/arch/arm/include/asm/exception.h
index 58e039a851af0..3c82975d46db3 100644
--- a/arch/arm/include/asm/exception.h
+++ b/arch/arm/include/asm/exception.h
@@ -10,10 +10,6 @@
 
 #include <linux/interrupt.h>
 
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
 #define __exception_irq_entry	__irq_entry
-#else
-#define __exception_irq_entry
-#endif
 
 #endif /* __ASM_ARM_EXCEPTION_H */
-- 
2.42.0