https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86092

--- Comment #2 from Srinivas Achary <srinivas.sundar at vvdntech dot in> ---
Sorry that I am new to this.....
Is there any possibility to make this code work, without changing the variable
attribute. GCC-4 has no issue with this code. What special flags have been
included in the GCC-5.

During disassemble the 
if(!kern_buff_p)
--
is changed to 
if x0 is kern_buff_p
mov x0, #0

This should be 
mov x0,[x0]

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