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[S390] add __ucmpdi2() helper function

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Provide __ucmpdi2() helper function on 31 bit so we don't run
again and again in compile errors like this one:

kernel/built-in.o: In function `T.689':
perf_counter.c:(.text+0x56c86): undefined reference to `__ucmpdi2'

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2009-07-07 16:37:09 +02:00 committed by Martin Schwidefsky
parent 2651fa2bcb
commit 5075baca2e
2 changed files with 27 additions and 1 deletions
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2
arch/s390/lib/Makefile
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@ -3,6 +3,6 @@
#
lib-y += delay.o string.o uaccess_std.o uaccess_pt.o
obj-$(CONFIG_32BIT) += div64.o qrnnd.o
obj-$(CONFIG_32BIT) += div64.o qrnnd.o ucmpdi2.o
lib-$(CONFIG_64BIT) += uaccess_mvcos.o
lib-$(CONFIG_SMP) += spinlock.o

26
arch/s390/lib/ucmpdi2.c Normal file
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@ -0,0 +1,26 @@
#include <linux/module.h>
union ull_union {
unsigned long long ull;
struct {
unsigned int high;
unsigned int low;
} ui;
};
int __ucmpdi2(unsigned long long a, unsigned long long b)
{
union ull_union au = {.ull = a};
union ull_union bu = {.ull = b};
if (au.ui.high < bu.ui.high)
return 0;
else if (au.ui.high > bu.ui.high)
return 2;
if (au.ui.low < bu.ui.low)
return 0;
else if (au.ui.low > bu.ui.low)
return 2;
return 1;
}
EXPORT_SYMBOL(__ucmpdi2);