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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 <[email protected]>
Reviewed-by: Martin Schwidefsky <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Vasily Gorbik 2018-04-11 19:15:24 +02:00 • committed by Martin Schwidefsky
commit 54c57795e8
4 changed files with 20 additions and 36 deletions
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3
drivers/s390/char/sclp_early_core.c
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@ -272,7 +272,7 @@ int __init sclp_early_get_info(struct read_info_sccb *info)
return 0;
}
int __init sclp_early_get_meminfo(unsigned long *mem, unsigned long *rzm)
int __init sclp_early_get_memsize(unsigned long *mem)
{
unsigned long rnmax;
unsigned long rnsize;
@ -285,7 +285,6 @@ int __init sclp_early_get_meminfo(unsigned long *mem, unsigned long *rzm)
rnsize = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
rnsize <<= 20;
*mem = rnsize * rnmax;
*rzm = rnsize;
return 0;
}