Identify true error value for kernel API's like kmalloc() and ioremap()

[manty kuma]

Hi

How to check for the error values for kernel API's like kmalloc() and
ioremap().

If the call fails, the return value is NULL. So, how do I know what caused
the failure? I have looked at examples in the kernel code. They are
returning a hard-coded value of -ENOMEM if kmalloc() fails.

Is there a way?

Regards,
Manty
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