linux-kernel - [PATCH 3/4] x86/smpboot: Replace one kzalloc() call by kcalloc()

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Date:   Mon, 5 Sep 2016 10:12:30 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     x86@...nel.org, Andi Kleen <ak@...ux.intel.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Borislav Petkov <bp@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
        Jürgen Groß <jgross@...e.com>,
        Len Brown <len.brown@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 3/4] x86/smpboot: Replace one kzalloc() call by kcalloc()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Mon, 5 Sep 2016 09:29:40 +0200

* The script "checkpatch.pl" can point information out like the following.

  WARNING: Prefer kcalloc over kzalloc with multiply

  Thus fix the affected source code place.

* Replace the specification of a data type by a pointer dereference
  to make the corresponding size determination a bit safer according to
  the Linux coding style convention.

* Delete the local variable "size" which became unnecessary with
  this refactoring.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 arch/x86/kernel/smpboot.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 2ce06ef..e3fdc44 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -311,7 +311,6 @@ EXPORT_SYMBOL(topology_phys_to_logical_pkg);
 static void __init smp_init_package_map(void)
 {
 	unsigned int ncpus, cpu;
-	size_t size;
 
 	/*
 	 * Today neither Intel nor AMD support heterogenous systems. That
@@ -357,8 +356,9 @@ static void __init smp_init_package_map(void)
 	memset(physical_to_logical_pkg,
 	       0xff,
 	       sizeof(*physical_to_logical_pkg) * max_physical_pkg_id);
-	size = BITS_TO_LONGS(max_physical_pkg_id) * sizeof(unsigned long);
-	physical_package_map = kzalloc(size, GFP_KERNEL);
+	physical_package_map = kcalloc(BITS_TO_LONGS(max_physical_pkg_id),
+				       sizeof(*physical_package_map),
+				       GFP_KERNEL);
 
 	for_each_present_cpu(cpu) {
 		unsigned int apicid = apic->cpu_present_to_apicid(cpu);
-- 
2.9.3