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riscv: add riscv-specific predefines to CHECKFLAGS 

RISC-V uses the macro __riscv_xlen, predefined by GCC, to
make the distinction between 32 or 64 bit code.

However, sparse doesn't know anything about this macro
which lead to wrong warnings and failures.

Fix this by adding a define of __riscv_xlen to CHECKFLAGS
and add one for __riscv too.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Luc Van Oostenryck 2018-05-31 17:42:01 +02:00 committed by Palmer Dabbelt
parent 32c81bced3
commit 889d746edd
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1 changed files with 3 additions and 0 deletions
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arch/riscv/Makefile
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@ -71,6 +71,9 @@ KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
# architectures. It's faster to have GCC emit only aligned accesses. # architectures. It's faster to have GCC emit only aligned accesses.
KBUILD_CFLAGS += $(call cc-option,-mstrict-align) KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
# arch specific predefines for sparse
CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
head-y := arch/riscv/kernel/head.o head-y := arch/riscv/kernel/head.o
core-y += arch/riscv/kernel/ arch/riscv/mm/ core-y += arch/riscv/kernel/ arch/riscv/mm/