MIPS: math-emu: Move various objects into an ar library.

ieee754d.o contains only debug code and dp_sqrt.o and sp_sqrt.o contain
code which for MIPS I/II/III systems we don't want to link.  Again the
savings can be considerable for some systems:

$ mips-linux-size --totals ieee754d.o dp_sqrt.o sp_sqrt.o
   text	   data	    bss	    dec	    hex	filename
   1624	      0	      0	   1624	    658	ieee754d.o
   2016	      0	      0	   2016	    7e0	dp_sqrt.o
    736	      0	      0	    736	    2e0	sp_sqrt.o
   4376	      0	      0	   4376	   1118	(TOTALS)
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kbuild

@@ -16,7 +16,6 @@ obj- := $(platform-)
 
 obj-y += kernel/
 obj-y += mm/
-obj-y += math-emu/
 
 ifdef CONFIG_KVM
 obj-y += kvm/

arch/mips/Makefile

@@ -251,6 +251,7 @@ OBJCOPYFLAGS		+= --remove-section=.reginfo
 head-y := arch/mips/kernel/head.o
 
 libs-y			+= arch/mips/lib/
+libs-y			+= arch/mips/math-emu/
 
 # See arch/mips/Kbuild for content of core part of the kernel
 core-y += arch/mips/

arch/mips/math-emu/Makefile

@@ -2,11 +2,12 @@
 # Makefile for the Linux/MIPS kernel FPU emulation.
 #
 
-obj-y	:= cp1emu.o ieee754d.o ieee754dp.o ieee754sp.o ieee754.o \
-	   ieee754xcpt.o dp_div.o dp_mul.o dp_sub.o dp_add.o dp_fsp.o \
-	   dp_cmp.o dp_simple.o dp_tint.o dp_fint.o dp_tlong.o dp_flong.o \
-	   sp_div.o sp_mul.o sp_sub.o sp_add.o sp_fdp.o sp_cmp.o sp_simple.o \
-	   sp_tint.o sp_fint.o sp_tlong.o sp_flong.o dp_sqrt.o sp_sqrt.o \
-	   kernel_linkage.o dsemul.o
+obj-y	+= cp1emu.o ieee754dp.o ieee754sp.o ieee754.o ieee754xcpt.o dp_div.o \
+	   dp_mul.o dp_sub.o dp_add.o dp_fsp.o dp_cmp.o dp_simple.o dp_tint.o \
+	   dp_fint.o dp_tlong.o dp_flong.o sp_div.o sp_mul.o sp_sub.o \
+	   sp_add.o sp_fdp.o sp_cmp.o sp_simple.o sp_tint.o sp_fint.o \
+	   sp_tlong.o sp_flong.o kernel_linkage.o dsemul.o
+
+lib-y	+= ieee754d.o dp_sqrt.o sp_sqrt.o
 
 obj-$(CONFIG_DEBUG_FS) += me-debugfs.o