Merge commit 'bf40167d54d5' into fixes

This fix is part of a series on for-next, but it fixes broken builds so
I'm picking it up as a fix.

* commit 'bf40167d54d5':
  riscv: vdso: Prevent the compiler from inserting calls to memset()

Author: palmer-dabbelt

arch/riscv/kernel/vdso/Makefile

@@ -18,6 +18,7 @@ obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o
 
 ccflags-y := -fno-stack-protector
 ccflags-y += -DDISABLE_BRANCH_PROFILING
+ccflags-y += -fno-builtin
 
 ifneq ($(c-gettimeofday-y),)
   CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y)