powerpc: Added __cmpdi2 for signed 64bit comparision

This was missing on powerpc and I am getting compilation error
drivers/vfio/pci/vfio_pci_rdwr.c:193: undefined reference to `__cmpdi2'
drivers/vfio/pci/vfio_pci_rdwr.c:193: undefined reference to `__cmpdi2'

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index 2b0ad984536333d7a15a3b39e6c9234c11b4b669..e47d268727a4a8ed87948a4d3ab5f87ad00793b1 100644 (file)
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -658,6 +658,20 @@ _GLOBAL(__lshrdi3)
        or      r4,r4,r7        # LSW |= t2
        blr
 
+/*
+ * 64-bit comparison: __cmpdi2(s64 a, s64 b)
+ * Returns 0 if a < b, 1 if a == b, 2 if a > b.
+ */
+_GLOBAL(__cmpdi2)
+       cmpw    r3,r5
+       li      r3,1
+       bne     1f
+       cmplw   r4,r6
+       beqlr
+1:     li      r3,0
+       bltlr
+       li      r3,2
+       blr
 /*
  * 64-bit comparison: __ucmpdi2(u64 a, u64 b)
  * Returns 0 if a < b, 1 if a == b, 2 if a > b.

diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index 60bbeb29f9b865795ea9b488037513f8f953d6c1..d8c34073b42a65ba74344cd14c5f09741321eea3 100644 (file)
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c
@@ -145,6 +145,8 @@ EXPORT_SYMBOL(__ashldi3);
 EXPORT_SYMBOL(__lshrdi3);
 int __ucmpdi2(unsigned long long, unsigned long long);
 EXPORT_SYMBOL(__ucmpdi2);
+int __cmpdi2(long long, long long);
+EXPORT_SYMBOL(__cmpdi2);
 #endif
 long long __bswapdi2(long long);
 EXPORT_SYMBOL(__bswapdi2);