On 4/1/20 1:12 AM, Tetsuo Handa wrote: > On 2020/03/30 20:55, Vlastimil Babka wrote: >> @@ -63,16 +63,6 @@ static struct task_struct *watchdog_task; >> unsigned int __read_mostly sysctl_hung_task_panic = >> CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE; >> >> -static int __init hung_task_panic_setup(char *str) >> -{ >> - int rc = kstrtouint(str, 0, &sysctl_hung_task_panic); >> - >> - if (rc) >> - return rc; >> - return 1; >> -} >> -__setup("hung_task_panic=", hung_task_panic_setup); > > Can we defer removal of this handler for "one release cycle" (and instead emit a line > saying that "this parameter will be replaced by ..." during that cycle) ? I welcome The old parameter is not removed, it's just handled differently, see patch 2. Both old name and new sysctl.name will work. > PATCH 1/3, but kernel testing projects (e.g. syzbot) needs to update their settings > between PATCH 1/3 was merged into linux.git and PATCH 3/3 is merged into linux.git . > > https://lkml.kernel.org/r/CACT4Y+YE-j5ncjTGN6UhngfCNRgVo-QDZ3VCBGACdbs9-v+axQ@xxxxxxxxxxxxxx says > "Announcing unmerged changes is too early (as this patch showed). And once it's in linux-next it's already too late.." > >> - >> static int >> hung_task_panic(struct notifier_block *this, unsigned long event, void *ptr) >> { >> >