linux-kernel - [PATCH 16/21] kcsan: don't use GENMASK()

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Message-ID: <20251025163305.306787-9-yury.norov@gmail.com>
Date: Sat, 25 Oct 2025 12:32:58 -0400
From: "Yury Norov (NVIDIA)" <yury.norov@...il.com>
To: Linus Walleij <linus.walleij@...aro.org>,
	Lee Jones <lee@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Marco Elver <elver@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	kasan-dev@...glegroups.com
Cc: "Yury Norov (NVIDIA)" <yury.norov@...il.com>
Subject: [PATCH 16/21] kcsan: don't use GENMASK()

GENMASK(high, low) notation is confusing. Use BITS(low, high) and
FIRST_BITS() where appropriate.

Signed-off-by: Yury Norov (NVIDIA) <yury.norov@...il.com>
---
 kernel/kcsan/encoding.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/kcsan/encoding.h b/kernel/kcsan/encoding.h
index 170a2bb22f53..3a4cb7b354e3 100644
--- a/kernel/kcsan/encoding.h
+++ b/kernel/kcsan/encoding.h
@@ -44,8 +44,8 @@
 
 /* Bitmasks for the encoded watchpoint access information. */
 #define WATCHPOINT_WRITE_MASK	BIT(BITS_PER_LONG-1)
-#define WATCHPOINT_SIZE_MASK	GENMASK(BITS_PER_LONG-2, WATCHPOINT_ADDR_BITS)
-#define WATCHPOINT_ADDR_MASK	GENMASK(WATCHPOINT_ADDR_BITS-1, 0)
+#define WATCHPOINT_ADDR_MASK	FIRST_BITS(WATCHPOINT_ADDR_BITS)
+#define WATCHPOINT_SIZE_MASK	BITS(WATCHPOINT_ADDR_BITS, BITS_PER_LONG-2)
 static_assert(WATCHPOINT_ADDR_MASK == (1UL << WATCHPOINT_ADDR_BITS) - 1);
 static_assert((WATCHPOINT_WRITE_MASK ^ WATCHPOINT_SIZE_MASK ^ WATCHPOINT_ADDR_MASK) == ~0UL);
 
-- 
2.43.0