5.15-stable review patch. If anyone has any objections, please let me know.
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From: Sumanth Korikkar sumanthk@linux.ibm.com
[ Upstream commit d15e4314abec83e4f910659437bc809b0889e3a5 ]
cmd_vdso_check checks if there are any dynamic relocations in vdso64.so.dbg. When kernel is compiled with -mno-pic-data-is-text-relative, R_390_RELATIVE relocs are generated and this results in kernel build error.
kpatch uses -mno-pic-data-is-text-relative option when building the kernel to prevent relative addressing between code and data. The flag avoids relocation error when klp text and data are too far apart
kpatch does not patch vdso code and hence the mno-pic-data-is-text-relative flag is not essential.
Signed-off-by: Sumanth Korikkar sumanthk@linux.ibm.com Acked-by: Ilya Leoshkevich iii@linux.ibm.com Signed-off-by: Alexander Gordeev agordeev@linux.ibm.com Stable-dep-of: 10f705253651 ("s390/vdso: Generate unwind information for C modules") Signed-off-by: Sasha Levin sashal@kernel.org --- arch/s390/kernel/vdso32/Makefile | 1 + arch/s390/kernel/vdso64/Makefile | 1 + 2 files changed, 2 insertions(+)
diff --git a/arch/s390/kernel/vdso32/Makefile b/arch/s390/kernel/vdso32/Makefile index cc513add48eb5..1783e4d335136 100644 --- a/arch/s390/kernel/vdso32/Makefile +++ b/arch/s390/kernel/vdso32/Makefile @@ -20,6 +20,7 @@ KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) KBUILD_AFLAGS_32 += -m31 -s
KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) +KBUILD_CFLAGS_32 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_32)) KBUILD_CFLAGS_32 += -m31 -fPIC -shared -fno-common -fno-builtin
LDFLAGS_vdso32.so.dbg += -shared -soname=linux-vdso32.so.1 \ diff --git a/arch/s390/kernel/vdso64/Makefile b/arch/s390/kernel/vdso64/Makefile index 42d918d50a1ff..08e87b083647c 100644 --- a/arch/s390/kernel/vdso64/Makefile +++ b/arch/s390/kernel/vdso64/Makefile @@ -25,6 +25,7 @@ KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS)) KBUILD_AFLAGS_64 += -m64 -s
KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS)) +KBUILD_CFLAGS_64 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_64)) KBUILD_CFLAGS_64 += -m64 -fPIC -fno-common -fno-builtin ldflags-y := -shared -soname=linux-vdso64.so.1 \ --hash-style=both --build-id=sha1 -T