* sparse bad constant expression caused by 7322dd755e7d ("byteswap: try to avoid __builtin_constant_p gcc bug", 2016-05-05)
@ 2016-06-21 23:14 Keller, Jacob E
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From: Keller, Jacob E @ 2016-06-21 23:14 UTC (permalink / raw)
To: linux-kernel; +Cc: Arnd Bergmann, Ingo Molnar, Josh Poimboeuf
Hi,
I recently ran into a sparse error when running sparse on Intel's i40e kernel driver against v4.7-rc3.
CC [M] drivers/net/ethernet/intel/i40e/i40e_nvm.o
include/linux/sctp.h:172:51: error: bad constant expression
include/linux/sctp.h:174:51: error: bad constant expression
include/linux/sctp.h:172:51: error: bad constant expression
include/linux/sctp.h:174:51: error: bad constant expression
include/linux/sctp.h:175:51: error: bad constant expression
include/linux/sctp.h:176:51: error: bad constant expression
include/linux/sctp.h:177:51: error: bad constant expression
include/linux/sctp.h:178:51: error: bad constant expression
And similar. I ran a bisect and determined the offending commit was 7322dd755e7d ("byteswap: try to avoid __builtin_constant_p gcc bug", 2016-05-05)
I am not sure if this is a regression in sparse, a real issue, or something else?
Thanks,
Jake
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