linux-kernel - [PATCH 08/27] m32r: Fix horrible logic in smp_prepare

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Message-ID: <20120601091201.31979.37258.stgit@srivatsabhat.in.ibm.com>
Date:	Fri, 01 Jun 2012 14:42:11 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	tglx@...utronix.de, peterz@...radead.org,
	paulmck@...ux.vnet.ibm.com
Cc:	rusty@...tcorp.com.au, mingo@...nel.org, yong.zhang0@...il.com,
	akpm@...ux-foundation.org, vatsa@...ux.vnet.ibm.com, rjw@...k.pl,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	srivatsa.bhat@...ux.vnet.ibm.com, nikunj@...ux.vnet.ibm.com,
	Hirokazu Takata <takata@...ux-m32r.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-m32r@...linux-m32r.org, linux-m32r-ja@...linux-m32r.org
Subject: [PATCH 08/27] m32r: Fix horrible logic in smp_prepare_cpus()

In smp_prepare_cpus(), after max_cpus are booted, instead of breaking
from the loop, the 'continue' statement is used which results in unnecessarily
wasting time by looping NR_CPUS times!

Many things around this could be pulled into generic code in the future, but
for now, fix this particular piece of code locally (because I am unable to
convince myself to ignore it even temporarily, given that it is such a gem!).

And also rewrite the 'if' statement in a more natural way.

Cc: Hirokazu Takata <takata@...ux-m32r.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-m32r@...linux-m32r.org
Cc: linux-m32r-ja@...linux-m32r.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

 arch/m32r/kernel/smpboot.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/m32r/kernel/smpboot.c b/arch/m32r/kernel/smpboot.c
index a2cfc0a..6ddc51a 100644
--- a/arch/m32r/kernel/smpboot.c
+++ b/arch/m32r/kernel/smpboot.c
@@ -209,8 +209,8 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 		if (!physid_isset(phys_id, phys_cpu_present_map))
 			continue;
 
-		if (max_cpus <= cpucount + 1)
-			continue;
+		if (cpucount + 1 >= max_cpus)
+			break;
 
 		do_boot_cpu(phys_id);
 

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