答复: [外部邮件] Re: [PATCH] sched/debug: reject zero writes to numa_balancing scan_size_mb

[Li,Rongqing]

> On Mon, Jul 14, 2026 at 01:30PM +0800, Li RongQing wrote:
> > +	debugfs_create_file("scan_size_mb", 0644, numa,
> > +			    &sysctl_numa_balancing_scan_size, &numa_scan_size_fops);
> 
> DEFINE_DEBUGFS_ATTRIBUTE() is meant to be paired with
> debugfs_create_file_unsafe() rather than debugfs_create_file():
> debugfs_attr_read()/write() already take removal protection via
> debugfs_file_get()/put(), so debugfs_create_file() just adds a redundant
> full_proxy layer. The "verbose" knob in this same file uses
> debugfs_create_file_unsafe() for that reason.
> 
> > +	if (val == 0 || val > UINT_MAX)
> > +		return -ERANGE;
> 
> The changelog says the value is rejected with -EINVAL, but the code returns
> -ERANGE -- could you make the two consistent? -ERANGE is fine.
> 
> The write-time rejection is the right approach; just the two points above.
> 

Thanks, I will send v2 with your advice.


[Li,Rongqing] 


> Thanks,
> Xusheng