linux-kernel - [PATCH 1/4] x86/smpboot: Use kmalloc_array() in smp_init_package

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Message-ID: <190dbaf0-e4ef-859a-346b-eb5ae5dfe583@users.sourceforge.net>
Date:   Mon, 5 Sep 2016 10:10:09 +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 1/4] x86/smpboot: Use kmalloc_array() in
 smp_init_package_map()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Mon, 5 Sep 2016 08:30:20 +0200

* A multiplication for the size determination of a memory allocation
  indicated that an array data structure should be processed.
  Thus use the corresponding function "kmalloc_array".

  This issue was detected by using the Coccinelle software.

* 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.

* Move a calculation for one function call.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 arch/x86/kernel/smpboot.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 3878725..36cf27e 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -349,9 +349,12 @@ static void __init smp_init_package_map(void)
 	 * package can be smaller than the actual used apic ids.
 	 */
 	max_physical_pkg_id = DIV_ROUND_UP(MAX_LOCAL_APIC, ncpus);
-	size = max_physical_pkg_id * sizeof(unsigned int);
-	physical_to_logical_pkg = kmalloc(size, GFP_KERNEL);
-	memset(physical_to_logical_pkg, 0xff, size);
+	physical_to_logical_pkg = kmalloc_array(max_physical_pkg_id,
+						sizeof(*physical_to_logical_pkg),
+						GFP_KERNEL);
+	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);
 
-- 
2.9.3