linux-kernel - [PATCH next 08/14] bits: simplify GENMASK

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Message-Id: <20260121145731.3623-9-david.laight.linux@gmail.com>
Date: Wed, 21 Jan 2026 14:57:25 +0000
From: david.laight.linux@...il.com
To: Nathan Chancellor <nathan@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Arnd Bergmann <arnd@...db.de>,
	linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yury Norov <yury.norov@...il.com>,
	Lucas De Marchi <lucas.demarchi@...el.com>,
	Jani Nikula <jani.nikula@...el.com>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Kees Cook <keescook@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: David Laight <david.laight.linux@...il.com>
Subject: [PATCH next 08/14] bits: simplify GENMASK_TYPE()

From: David Laight <david.laight.linux@...il.com>

Since the type is always unsigned (T)-1 is always the correct value
so there is no need to use type_max().

Signed-off-by: David Laight <david.laight.linux@...il.com>
---
 include/linux/bits.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/include/linux/bits.h b/include/linux/bits.h
index a40cc861b3a7..697318f2a47d 100644
--- a/include/linux/bits.h
+++ b/include/linux/bits.h
@@ -45,8 +45,7 @@
  */
 #define GENMASK_TYPE(t, h, l)					\
 	((t)(GENMASK_INPUT_CHECK(h, l) +			\
-	     (type_max(t) << (l) &				\
-	      type_max(t) >> (BITS_PER_TYPE(t) - 1 - (h)))))
+	     ((t)-1 << (l) & (t)-1 >> (BITS_PER_TYPE(t) - 1 - (h)))))
 
 #define GENMASK(h, l)		GENMASK_TYPE(unsigned long, h, l)
 #define GENMASK_ULL(h, l)	GENMASK_TYPE(unsigned long long, h, l)
-- 
2.39.5