> On Tue, Nov 02, 2021 at 08:08:05PM +0800, Mark-PK Tsai wrote: > > Use %d format string to print return error code which > > make the error message easier to understand. > > Even better, if you use %pe after converting "ret" to a pointer via > ERR_PTR(ret), when the kernel is appropriately configured, the kernel > will give a textual version of the error code, which is even easier! Thanks for the suggestion! I will use it in v2.