s390/mem_detect: replace tprot loop with binary search

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In a situation when other memory detection methods are not available
(no SCLP and no z/VM diag260), continuous online memory is assumed.
Replacing tprot loop with faster binary search, as only online memory
end has to be found.

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

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Vasily Gorbik 2018-04-11 19:15:24 +02:00 • committed by Martin Schwidefsky

parent cd45c99561

commit 54c57795e8

4 changed files with 20 additions and 36 deletions

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45

arch/s390/boot/mem_detect.c

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2

arch/s390/include/asm/mem_detect.h

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2

arch/s390/include/asm/sclp.h

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3

drivers/s390/char/sclp_early_core.c

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