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From: Adrian Hunter <adrian.hunter@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	John Stultz <jstultz@google.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	linux-s390@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
	x86@kernel.org, "Aneesh Kumar K.V" <aneesh.kumar@kernel.org>,
	Ingo Molnar <mingo@redhat.com>,
	"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
	Christian Borntraeger <borntraeger@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Heiko Carstens <hca@linux.ibm.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Anna-Maria Behnsen <anna-maria@linutronix.de>,
	Stephen Boyd <sboyd@kernel.org>,
	Randy Dunlap <rdunlap@infradead.org>,
	linux-kernel@vger.kernel.org, Sven Schnelle <svens@linux.ibm.com>,
	linuxppc-dev@lists.ozlabs.org
Subject: [PATCH V2 04/19] math64: Tidy mul_u64_u32_shr()
Date: Mon, 25 Mar 2024 08:40:08 +0200	[thread overview]
Message-ID: <20240325064023.2997-5-adrian.hunter@intel.com> (raw)
In-Reply-To: <20240325064023.2997-1-adrian.hunter@intel.com>

Put together declaration and initialization of local variables.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 include/linux/math64.h | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/include/linux/math64.h b/include/linux/math64.h
index bf74478926d4..fd13622b2056 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h
@@ -179,16 +179,12 @@ static __always_inline u64 mul_u64_u64_shr(u64 a, u64 mul, unsigned int shift)
 #ifndef mul_u64_u32_shr
 static __always_inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift)
 {
-	u32 ah, al;
+	u32 ah = a >> 32, al = a;
 	u64 ret;
 
-	al = a;
-	ah = a >> 32;
-
 	ret = mul_u32_u32(al, mul) >> shift;
 	if (ah)
 		ret += mul_u32_u32(ah, mul) << (32 - shift);
-
 	return ret;
 }
 #endif /* mul_u64_u32_shr */
-- 
2.34.1


WARNING: multiple messages have this Message-ID (diff)
From: Adrian Hunter <adrian.hunter@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	Christophe Leroy <christophe.leroy@csgroup.eu>,
	"Aneesh Kumar K.V" <aneesh.kumar@kernel.org>,
	"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Christian Borntraeger <borntraeger@linux.ibm.com>,
	Sven Schnelle <svens@linux.ibm.com>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	Andy Lutomirski <luto@kernel.org>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	John Stultz <jstultz@google.com>, Stephen Boyd <sboyd@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Randy Dunlap <rdunlap@infradead.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Anna-Maria Behnsen <anna-maria@linutronix.de>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	linux-s390@vger.kernel.org
Subject: [PATCH V2 04/19] math64: Tidy mul_u64_u32_shr()
Date: Mon, 25 Mar 2024 08:40:08 +0200	[thread overview]
Message-ID: <20240325064023.2997-5-adrian.hunter@intel.com> (raw)
In-Reply-To: <20240325064023.2997-1-adrian.hunter@intel.com>

Put together declaration and initialization of local variables.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 include/linux/math64.h | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/include/linux/math64.h b/include/linux/math64.h
index bf74478926d4..fd13622b2056 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h
@@ -179,16 +179,12 @@ static __always_inline u64 mul_u64_u64_shr(u64 a, u64 mul, unsigned int shift)
 #ifndef mul_u64_u32_shr
 static __always_inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift)
 {
-	u32 ah, al;
+	u32 ah = a >> 32, al = a;
 	u64 ret;
 
-	al = a;
-	ah = a >> 32;
-
 	ret = mul_u32_u32(al, mul) >> shift;
 	if (ah)
 		ret += mul_u32_u32(ah, mul) << (32 - shift);
-
 	return ret;
 }
 #endif /* mul_u64_u32_shr */
-- 
2.34.1


  parent reply	other threads:[~2024-03-25  6:44 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-25  6:40 [PATCH V2 00/19] timekeeping: Handle potential multiplication overflow Adrian Hunter
2024-03-25  6:40 ` Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 01/19] vdso: Consolidate vdso_calc_delta() Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 02/19] vdso: Consolidate nanoseconds calculation Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 03/19] vdso: Add CONFIG_GENERIC_VDSO_OVERFLOW_PROTECT Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` Adrian Hunter [this message]
2024-03-25  6:40   ` [PATCH V2 04/19] math64: Tidy mul_u64_u32_shr() Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] math64: Tidy up mul_u64_u32_shr() tip-bot2 for Adrian Hunter
2024-04-24 15:11   ` [PATCH V2 04/19] math64: Tidy mul_u64_u32_shr() Peter Zijlstra
2024-04-24 15:11     ` Peter Zijlstra
2024-03-25  6:40 ` [PATCH V2 05/19] vdso: math64: Provide mul_u64_u32_add_u64_shr() Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] vdso, " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 06/19] vdso: Add vdso_data::max_cycles Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] vdso: Add vdso_data:: Max_cycles tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 07/19] vdso: Make delta calculation overflow safe Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 08/19] x86/vdso: " Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 09/19] timekeeping: Move timekeeping helper functions Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 10/19] timekeeping: Rename fast_tk_get_delta_ns() to __timekeeping_get_ns() Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 11/19] timekeeping: Tidy timekeeping_cycles_to_ns() slightly Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 12/19] timekeeping: Reuse timekeeping_cycles_to_ns() Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 13/19] timekeeping: Refactor timekeeping helpers Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 14/19] timekeeping: Consolidate " Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 15/19] timekeeping: Fold in timekeeping_delta_to_ns() Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 16/19] timekeeping: Prepare timekeeping_cycles_to_ns() for overflow safety Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 17/19] timekeeping: Make delta calculation overflow safe Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 18/19] timekeeping: Let timekeeping_cycles_to_ns() handle both under and overflow Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25  6:40 ` [PATCH V2 19/19] clocksource: Make watchdog and suspend-timing multiplication overflow safe Adrian Hunter
2024-03-25  6:40   ` Adrian Hunter
2024-04-08 13:10   ` [tip: timers/core] " tip-bot2 for Adrian Hunter
2024-03-25 18:11 ` [PATCH V2 00/19] timekeeping: Handle potential multiplication overflow Arnd Bergmann

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