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Message-Id: <20230626214956.178942-15-sashal@kernel.org>
Date:   Mon, 26 Jun 2023 17:49:55 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Qing Zhang <zhangqing@...ngson.cn>,
        Colin King <colin.i.king@...il.com>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Sasha Levin <sashal@...nel.org>, chenhuacai@...nel.org,
        loongarch@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.3 15/16] LoongArch: Avoid uninitialized alignment_mask

From: Qing Zhang <zhangqing@...ngson.cn>

[ Upstream commit 0246d0aaf0a634a65135050011767b56ba351a8f ]

The hardware monitoring points for instruction fetching and load/store
operations need to align 4 bytes and 1/2/4/8 bytes respectively.

Reported-by: Colin King <colin.i.king@...il.com>
Signed-off-by: Qing Zhang <zhangqing@...ngson.cn>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/loongarch/kernel/hw_breakpoint.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/loongarch/kernel/hw_breakpoint.c b/arch/loongarch/kernel/hw_breakpoint.c
index 2406c95b34cc4..021b59c248fac 100644
--- a/arch/loongarch/kernel/hw_breakpoint.c
+++ b/arch/loongarch/kernel/hw_breakpoint.c
@@ -396,6 +396,8 @@ int hw_breakpoint_arch_parse(struct perf_event *bp,
 
 	if (hw->ctrl.type != LOONGARCH_BREAKPOINT_EXECUTE)
 		alignment_mask = 0x7;
+	else
+		alignment_mask = 0x3;
 	offset = hw->address & alignment_mask;
 
 	hw->address &= ~alignment_mask;
-- 
2.39.2

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