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authorHeiko Carstens <heiko.carstens@de.ibm.com>2009-07-07 16:37:09 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-07-07 16:37:53 +0200
commit5075baca2e95840d76210c3cfda56134007462c9 (patch)
tree0cb0078bdbb4c2760d9846eae6466044ba92a21e /arch/s390/lib
parent2651fa2bcb1a7b06793441d50dcbf98efda592c6 (diff)
downloadlinux-linaro-android-5075baca2e95840d76210c3cfda56134007462c9.tar.gz
[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/Makefile2
-rw-r--r--arch/s390/lib/ucmpdi2.c26
2 files changed, 27 insertions, 1 deletions
diff --git a/arch/s390/lib/Makefile b/arch/s390/lib/Makefile
index ab6735df2d2..97975ec7a27 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 00000000000..3e05ff53258
--- /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);