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s390/expoline: Make modules use kernel expolines

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Currently, kernel modules contain their own set of expoline thunks. In
the case of EXPOLINE_EXTERN, this involves postlinking of precompiled
expoline.o. expoline.o is also necessary for out-of-source tree module
builds.

Now that the kernel modules area is less than 4 GB away from
kernel expoline thunks, make modules use kernel expolines. Also make
EXPOLINE_EXTERN the default if the compiler supports it. This simplifies
build and aligns with the approach adopted by other architectures.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Vasily Gorbik
2024-01-17 11:50:49 +01:00
committed by Alexander Gordeev
parent ea84f14d2a
commit ba05b39d54
9 changed files with 30 additions and 22 deletions
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6
arch/s390/Makefile
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@@ -88,7 +88,6 @@ endif
ifdef CONFIG_EXPOLINE
ifdef CONFIG_EXPOLINE_EXTERN
KBUILD_LDFLAGS_MODULE += arch/s390/lib/expoline/expoline.o
CC_FLAGS_EXPOLINE := -mindirect-branch=thunk-extern
CC_FLAGS_EXPOLINE += -mfunction-return=thunk-extern
else
@@ -167,11 +166,6 @@ vdso_prepare: prepare0
vdso-install-y += arch/s390/kernel/vdso64/vdso64.so.dbg
vdso-install-$(CONFIG_COMPAT) += arch/s390/kernel/vdso32/vdso32.so.dbg
ifdef CONFIG_EXPOLINE_EXTERN
modules_prepare: expoline_prepare
expoline_prepare: scripts
$(Q)$(MAKE) $(build)=arch/s390/lib/expoline arch/s390/lib/expoline/expoline.o
endif
endif
# Don't use tabs in echo arguments