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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>
This commit is contained in:
Vasily Gorbik 2018-01-17 14:51:57 +01:00 committed by Martin Schwidefsky
parent 6dd0d2d22a
commit 47d67facb0
2 changed files with 7 additions and 0 deletions
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1
arch/s390/boot/compressed/Makefile
View File

@ -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)

6
arch/s390/boot/compressed/vmlinux.lds.S
View File

@ -48,4 +48,10 @@ SECTIONS
_ebss = .;
}
_end = .;
/* Sections to be discarded */
/DISCARD/ : {
*(.eh_frame)
*(*__ksymtab*)
}
}