s390/decompressor: trim uncompressed image head during the build

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It seems to be suboptimal to compress the entire image, so that we
could decompress and throw away the first 68k (0x11000) during the boot
process. This patch trims 0x11000 bytes during the build process and
adjusts symbols in size.h accordingly.

Besides making bzImage smaller, this change would also be a benefit
for kaslr. It allows to decompress the kernel right to desired offset,
without worrying about dead weight in front of the decompressed image.

Signed-off-by: Vasily Gorbik <gor@linux.vnet.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Vasily Gorbik 2018-03-05 09:58:00 +01:00 • committed by Martin Schwidefsky

parent c7260ca335

commit 81796a3c6a

2 changed files with 14 additions and 8 deletions

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16

arch/s390/boot/compressed/Makefile

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6

arch/s390/boot/compressed/head.S

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