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Message-ID: <20201105180953.GI1602@alley>
Date: Thu, 5 Nov 2020 19:09:53 +0100
From: Petr Mladek <pmladek@...e.com>
To: Matteo Croce <mcroce@...ux.microsoft.com>
Cc: linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
Arnd Bergmann <arnd@...db.de>, Mike Rapoport <rppt@...nel.org>,
Kees Cook <keescook@...omium.org>,
Pavel Tatashin <pasha.tatashin@...een.com>,
Robin Holt <robinmholt@...il.com>,
Fabian Frederick <fabf@...net.be>,
Andrew Morton <akpm@...ux-foundation.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v3 3/3] reboot: refactor and comment the cpu selection
code
On Tue 2020-11-03 22:40:25, Matteo Croce wrote:
> From: Matteo Croce <mcroce@...rosoft.com>
>
> Small improvements to the code, without changing the way it works:
> - use a local variable, to avoid a small time lapse where reboot_cpu
> can have an invalid value
> - comment the code which is not easy to understand at a glance
> - merge two identical code blocks into one
> - replace pointer arithmetics with equivalent array syntax
>
> Signed-off-by: Matteo Croce <mcroce@...rosoft.com>
> ---
> kernel/reboot.c | 30 +++++++++++++++++-------------
> 1 file changed, 17 insertions(+), 13 deletions(-)
>
> diff --git a/kernel/reboot.c b/kernel/reboot.c
> index af6f23d8bea1..dd483bde932b 100644
> --- a/kernel/reboot.c
> +++ b/kernel/reboot.c
> @@ -551,20 +551,24 @@ static int __init reboot_setup(char *str)
> break;
>
> case 's':
> - if (isdigit(*(str+1)))
> - reboot_cpu = simple_strtoul(str+1, NULL, 0);
> - else if (str[1] == 'm' && str[2] == 'p' &&
> - isdigit(*(str+3)))
> - reboot_cpu = simple_strtoul(str+3, NULL, 0);
> - else
> + /*
> + * reboot_cpu is s[mp]#### with #### being the processor
> + * to be used for rebooting. Skip 's' or 'smp' prefix.
> + */
> + str += str[1] == 'm' && str[2] == 'p' ? 3 : 1;
> +
> + if (isdigit(str[0])) {
> + int cpu = simple_strtoul(str, NULL, 0);
> +
> + if (cpu >= num_possible_cpus()) {
> + pr_err("Ignoring the CPU number in reboot= option. "
> + "CPU %d exceeds possible cpu number %d\n",
Same here. I am not sure if Andrew would like to get this on a single
line.
In both cases:
Reviewed-by: Petr Mladek <pmladek@...e.com>
Best Regards,
Petr
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