powerpc: Implement smp_release_cpus() in C not asm

There's no reason for smp_release_cpus() to be asm, and most people can make
more sense of C code. Add an extern declaration to smp.h and remove the custom
one in machine_kexec.c

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

1 files changed, 0 insertions, 18 deletions

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index ba30e3177b05..45d81976987f 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -1914,24 +1914,6 @@ _GLOBAL(hmt_start_secondary)
         blr
 #endif
 
-#if defined(CONFIG_KEXEC) || defined(CONFIG_SMP)
-_GLOBAL(smp_release_cpus)
-        /* All secondary cpus are spinning on a common
-         * spinloop, release them all now so they can start
-         * to spin on their individual paca spinloops.
-         * For non SMP kernels, the secondary cpus never
-         * get out of the common spinloop.
-         * XXX This does nothing useful on iSeries, secondaries are
-         * already waiting on their paca.
-         */
-        li      r3,1
-        LOADADDR(r5,__secondary_hold_spinloop)
-        std     r3,0(r5)
-        sync
-        blr
-#endif /* CONFIG_SMP */
-
-
 /*
  * We put a few things here that have to be page-aligned.
  * This stuff goes at the beginning of the bss, which is page-aligned.