powerpc/kexec: Restore ppc_md.machine_kexec

Kyle Moffett points out that mpc85xx has started using the
ppc_md.machine_kexec hook. As such, revert patch c94868788cf2
(powerpc/kexec: Remove ppc_md.machine_kexec).

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
index 991d599..fe56a23 100644 (file)
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -240,6 +240,12 @@ struct machdep_calls {
         * claims to support kexec.
         */
        int (*machine_kexec_prepare)(struct kimage *image);
+
+       /* Called to perform the _real_ kexec.
+        * Do NOT allocate memory or fail here. We are past the point of
+        * no return.
+        */
+       void (*machine_kexec)(struct kimage *image);
 #endif /* CONFIG_KEXEC */
 
 #ifdef CONFIG_SUSPEND

diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
index 49a170a..a5f8672 100644 (file)
--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -87,7 +87,10 @@ void machine_kexec(struct kimage *image)
 
        save_ftrace_enabled = __ftrace_enabled_save();
 
-       default_machine_kexec(image);
+       if (ppc_md.machine_kexec)
+               ppc_md.machine_kexec(image);
+       else
+               default_machine_kexec(image);
 
        __ftrace_enabled_restore(save_ftrace_enabled);