How to fix CHECK warning: testing a 'safe expression' ?

[Murali Karicheri <m-karicheri2@ti.com>]

I am trying to address CHECK warnings in my driver and wondering how to 
resolve 'warning: testing a 'safe expression' which appears when using
IS_ERR_OR_NULL(foo)

where foo is defined as

struct foo_type *foo;

The foo get assigned only NULL or ERR_PTR(error code). So I believe the
usage is correct. But then how do I make the CHECK happy of its usage?

I have tried a grep to check on the current usage of IS_ERR_OR_NULL() 
and found 276 of them causes this warning in the v3.18 version of the 
kernel that I am using

$ grep -r "warning: testing a 'safe expression" * | wc -l
276

Can someone help me undestand what this means and how to fix the same?

I run folling for CHECK

make C=2 CF="-D__CHECK_ENDIAN__" CHECK=sparse

Thanks in advance for your suggestions.
-- 
Murali Karicheri
Linux Kernel, Texas Instruments
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