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riscv: vdso: Prevent the compiler from inserting calls to memset()

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[ Upstream commit bf40167d54d55d4b54d0103713d86a8638fb9290 ]

The compiler is smart enough to insert a call to memset() in
riscv_vdso_get_cpus(), which generates a dynamic relocation.

So prevent this by using -fno-builtin option.

Fixes: e2c0cdfba7 ("RISC-V: User-facing API")
Cc: stable@vger.kernel.org
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20241016083625.136311-2-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexandre Ghiti 2024-10-16 10:36:24 +02:00 • committed by Greg Kroah-Hartman
parent e79c1f1c91
commit c19a0c171d
1 changed files with 1 additions and 0 deletions
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1
arch/riscv/kernel/vdso/Makefile
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@ -18,6 +18,7 @@ obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o
ccflags-y := -fno-stack-protector ccflags-y := -fno-stack-protector
ccflags-y += -DDISABLE_BRANCH_PROFILING ccflags-y += -DDISABLE_BRANCH_PROFILING
ccflags-y += -fno-builtin
ifneq ($(c-gettimeofday-y),) ifneq ($(c-gettimeofday-y),)
CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y) CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y)