linux-kernel - [PATCH 6/7] sched/fair: Use mul_u32

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Message-Id: <20191108131909.717931380@infradead.org>
Date:   Fri, 08 Nov 2019 14:15:59 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, juri.lelli@...hat.com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de
Cc:     linux-kernel@...r.kernel.org, qperret@...gle.com,
        valentin.schneider@....com, qais.yousef@....com,
        ktkhai@...tuozzo.com, peterz@...radead.org
Subject: [PATCH 6/7] sched/fair: Use mul_u32_u32()

While reading the code I encountered another site where we should be
using mul_u32_u32() because GCC just won't take a hint.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/sched/fair.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -229,8 +229,7 @@ static u64 __calc_delta(u64 delta_exec,
 		}
 	}
 
-	/* hint to use a 32x32->64 mul */
-	fact = (u64)(u32)fact * lw->inv_weight;
+	fact = mul_u32_u32(fact, lw->inv_weight);
 
 	while (fact >> 32) {
 		fact >>= 1;