Commit 4bf3ec38 authored Sep 07, 2020 by Sven Schnelle Committed by Vasily Gorbik Sep 14, 2020

s390: disable branch profiling for vdso



When branch profiling is enabled, if () gets annotated with code to
instrument the hit/miss ratio. This doesn't work for VDSO as we can't
access kernel code. Add -DDISABLE_BRANCH_PROFILING to fix this.

Reported-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

parent 4bff8cb5

arch/s390/kernel/vdso64/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -17,7 +17,7 @@ obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
		obj-cvdso64 := $(addprefix $(obj)/, $(obj-cvdso64))

		KBUILD_AFLAGS += -DBUILD_VDSO
		KBUILD_CFLAGS += -DBUILD_VDSO
		KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING

		KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS))
		KBUILD_AFLAGS_64 += -m64 -s

Admin message