Re: [PATCH] blk-mq: avoid sysfs buffer overflow by too many CPU cores

On 11/2/19 2:02 AM, Ming Lei wrote:

It is reported that sysfs buffer overflow can be triggered in case of too many CPU cores(>841 on 4K PAGE_SIZE) when showing CPUs of hctx via /sys/block/$DEV/mq/$N/cpu_list.

So use snprintf for avoiding the potential buffer overflow.

This version doesn't change the attribute format, and simply stop to show CPU number if the buffer is to be overflow.

Applied, thanks.