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riscv: Add -fPIC option to CFLAGS_vgettimeofday.o

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The time related vDSO functions use a variable, vdso_data, to access the
vDSO data page to get the system time information. Because the vdso_data
for CFLAGS_vgettimeofday.o is an external variable defined in vdso.o,
the CFLAGS_vgettimeofday.o should be compiled with -fPIC to ensure
that vdso_data is addressable.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Vincent Chen 2020-06-23 09:13:22 +08:00 • committed by Palmer Dabbelt
parent 48778464bb
commit a0fc3b3289
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1 changed files with 1 additions and 1 deletions
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2
arch/riscv/kernel/vdso/Makefile
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@ -17,7 +17,7 @@ vdso-syms += flush_icache
obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o
ifneq ($(c-gettimeofday-y),)
CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y)
endif
# Build rules