Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6cc0735d0dbf6a0e5f802f47d51e1e463466955c
Commit:     6cc0735d0dbf6a0e5f802f47d51e1e463466955c
Parent:     6c8f5b90bfbe69a27763fb0e181bd2465181446d
Author:     David S. Miller <[EMAIL PROTECTED]>
AuthorDate: Sat Aug 25 15:10:44 2007 -0700
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Sun Aug 26 18:49:09 2007 -0700

    [SPARC32]: Add __cmpdi2() libcall implementation ala. MIPS.
    
    Device mapper generates calls to this with recent versions
    of gcc.
    
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
 arch/sparc/lib/Makefile |    3 ++-
 arch/sparc/lib/cmpdi2.c |   27 +++++++++++++++++++++++++++
 arch/sparc/lib/libgcc.h |   18 ++++++++++++++++++
 3 files changed, 47 insertions(+), 1 deletions(-)

diff --git a/arch/sparc/lib/Makefile b/arch/sparc/lib/Makefile
index 9ddc5b9..76effdb 100644
--- a/arch/sparc/lib/Makefile
+++ b/arch/sparc/lib/Makefile
@@ -8,6 +8,7 @@ lib-y := mul.o rem.o sdiv.o udiv.o umul.o urem.o ashrdi3.o 
memcpy.o memset.o \
          strlen.o checksum.o blockops.o memscan.o memcmp.o strncmp.o \
         strncpy_from_user.o divdi3.o udivdi3.o strlen_user.o \
         copy_user.o locks.o atomic.o \
-        lshrdi3.o ashldi3.o rwsem.o muldi3.o bitext.o
+        lshrdi3.o ashldi3.o rwsem.o muldi3.o bitext.o \
+        cmpdi2.o
 
 obj-y += iomap.o atomic32.o
diff --git a/arch/sparc/lib/cmpdi2.c b/arch/sparc/lib/cmpdi2.c
new file mode 100644
index 0000000..8c13064
--- /dev/null
+++ b/arch/sparc/lib/cmpdi2.c
@@ -0,0 +1,27 @@
+#include <linux/module.h>
+
+#include "libgcc.h"
+
+word_type __cmpdi2(long long a, long long b)
+{
+       const DWunion au = {
+               .ll = a
+       };
+       const DWunion bu = {
+               .ll = b
+       };
+
+       if (au.s.high < bu.s.high)
+               return 0;
+       else if (au.s.high > bu.s.high)
+               return 2;
+
+       if ((unsigned int) au.s.low < (unsigned int) bu.s.low)
+               return 0;
+       else if ((unsigned int) au.s.low > (unsigned int) bu.s.low)
+               return 2;
+
+       return 1;
+}
+
+EXPORT_SYMBOL(__cmpdi2);
diff --git a/arch/sparc/lib/libgcc.h b/arch/sparc/lib/libgcc.h
new file mode 100644
index 0000000..b84fd79
--- /dev/null
+++ b/arch/sparc/lib/libgcc.h
@@ -0,0 +1,18 @@
+#ifndef __ASM_LIBGCC_H
+#define __ASM_LIBGCC_H
+
+#include <asm/byteorder.h>
+
+typedef int word_type __attribute__ ((mode (__word__)));
+
+struct DWstruct {
+       int high, low;
+};
+
+typedef union
+{
+       struct DWstruct s;
+       long long ll;
+} DWunion;
+
+#endif /* __ASM_LIBGCC_H */
-
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