The patch titled
Subject: reboot: refactor and comment the cpu selection code
has been added to the -mm tree. Its filename is
reboot-refactor-and-comment-the-cpu-selection-code.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/reboot-refactor-and-comment-the-cpu-selection-code.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/reboot-refactor-and-comment-the-cpu-selection-code.patch
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------------------------------------------------------
From: Matteo Croce <mcroce@xxxxxxxxxxxxx>
Subject: reboot: refactor and comment the cpu selection code
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
Link: https://lkml.kernel.org/r/20201103214025.116799-4-mcroce@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Matteo Croce <mcroce@xxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Fabian Frederick <fabf@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxxx>
Cc: Robin Holt <robinmholt@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/reboot.c | 30 +++++++++++++++++-------------
1 file changed, 17 insertions(+), 13 deletions(-)
--- a/kernel/reboot.c~reboot-refactor-and-comment-the-cpu-selection-code
+++ a/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",
+ cpu, num_possible_cpus());
+ break;
+ }
+ reboot_cpu = cpu;
+ } else
*mode = REBOOT_SOFT;
- if (reboot_cpu >= num_possible_cpus()) {
- pr_err("Ignoring the CPU number in reboot= option. "
- "CPU %d exceeds possible cpu number %d\n",
- reboot_cpu, num_possible_cpus());
- reboot_cpu = 0;
- break;
- }
break;
case 'g':
_
Patches currently in -mm which might be from mcroce@xxxxxxxxxxxxx are
revert-kernel-rebootc-convert-simple_strtoul-to-kstrtoint.patch
reboot-fix-overflow-parsing-reboot-cpu-number.patch
reboot-refactor-and-comment-the-cpu-selection-code.patch
