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authorVasily Gorbik <gor@linux.vnet.ibm.com>2018-01-17 14:51:57 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2018-01-23 07:36:54 +0100
commit47d67facb057b15d29d65170df06b102a3ddd34e (patch)
treea064e5beb87727dc8cf2d9d79e9aa9622856e127 /arch/s390
parent6dd0d2d22aa363fec075cb2577ba273ac8462e94 (diff)
s390/decompressor: discard __ksymtab and .eh_frame sections
__ksymtab sections created for exported symbols are not needed during the decompressor phase and could be discarded to save the memory. The source of those exports is ebcdic.o, which is linked into both vmlinux and boot/compressed/vmlinux. .eh_frame section is also unused and could be discarded from boot/compressed/vmlinux. The same has been done for vmlinux in: "s390/kernel: emit CFI data in .debug_frame and discard .eh_frame sections". Signed-off-by: Vasily Gorbik <gor@linux.vnet.ibm.com> Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/boot/compressed/Makefile1
-rw-r--r--arch/s390/boot/compressed/vmlinux.lds.S6
2 files changed, 7 insertions, 0 deletions
diff --git a/arch/s390/boot/compressed/Makefile b/arch/s390/boot/compressed/Makefile
index 29e3dc99b916..26d6a94f40f6 100644
--- a/arch/s390/boot/compressed/Makefile
+++ b/arch/s390/boot/compressed/Makefile
@@ -14,6 +14,7 @@ targets += misc.o piggy.o sizes.h head.o
KBUILD_CFLAGS := -m64 -D__KERNEL__ -O2
KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
KBUILD_CFLAGS += $(cflags-y) -fno-delete-null-pointer-checks -msoft-float
+KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
KBUILD_CFLAGS += $(call cc-option,-mpacked-stack)
KBUILD_CFLAGS += $(call cc-option,-ffreestanding)
diff --git a/arch/s390/boot/compressed/vmlinux.lds.S b/arch/s390/boot/compressed/vmlinux.lds.S
index 0c42535ec696..8150132b144f 100644
--- a/arch/s390/boot/compressed/vmlinux.lds.S
+++ b/arch/s390/boot/compressed/vmlinux.lds.S
@@ -48,4 +48,10 @@ SECTIONS
_ebss = .;
}
_end = .;
+
+ /* Sections to be discarded */
+ /DISCARD/ : {
+ *(.eh_frame)
+ *(*__ksymtab*)
+ }
}