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

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Date:   Mon, 5 Sep 2016 11:19:51 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
cc:     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>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH 1/4] x86/smpboot: Use kmalloc_array() in
 smp_init_package_map()

On Mon, 5 Sep 2016, SF Markus Elfring wrote:

> 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);


Why are you replacing well readable code by this line breaked crap?

Stop acting like a shell script or we might replace you by one.

Thanks,

	tglx