Re: [PATCH v1] thermal/core: change mm alloc method to avoid kernel warning

[Zhang Rui]

On Sun, 2022-04-17 at 12:56 +0000, Junwen Wu wrote:
> Very high cooling device max state value makes cooling device stats
> buffer allocation fails,like below.Using kzvalloc instead of kzalloc
> can avoid this issue.

When a cooling device has big max_state, this patch can get ride of the
warning here, but still we end up with the read failure of the
trans_table in sysfs because it is larger than PAGE_SIZE.

$ cat /sys/class/thermal/cooling_device8/stats/trans_table 
cat: /sys/class/thermal/cooling_device8/stats/trans_table: File too
large

IMO, unless we can fix both places, I'd suggest we skip allocating and
creating the broken trans_table attr. Like a prototype patch below

thanks,
rui