diff options
| author | Heiko Carstens | 2009-07-07 16:37:09 +0200 |
|---|---|---|
| committer | Martin Schwidefsky | 2009-07-07 16:37:53 +0200 |
| commit | 5075baca2e95840d76210c3cfda56134007462c9 (patch) | |
| tree | 0cb0078bdbb4c2760d9846eae6466044ba92a21e /arch/s390/lib | |
| parent | 2651fa2bcb1a7b06793441d50dcbf98efda592c6 (diff) | |
[S390] add __ucmpdi2() helper function
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>
Diffstat (limited to 'arch/s390/lib')
| -rw-r--r-- | arch/s390/lib/Makefile | 2 | ||||
| -rw-r--r-- | arch/s390/lib/ucmpdi2.c | 26 |
2 files changed, 27 insertions, 1 deletions
diff --git a/arch/s390/lib/Makefile b/arch/s390/lib/Makefile index ab6735df2d21..97975ec7a274 100644 --- a/arch/s390/lib/Makefile +++ b/arch/s390/lib/Makefile @@ -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 diff --git a/arch/s390/lib/ucmpdi2.c b/arch/s390/lib/ucmpdi2.c new file mode 100644 index 000000000000..3e05ff532582 --- /dev/null +++ b/arch/s390/lib/ucmpdi2.c @@ -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); |