[ARM] add machine-specific hook to machine_kexec

Provide the option to call a machine-specific function
before kexec'ing a new kernel.

Signed-off-by: Eric Cooper <ecc@cmu.edu>
Signed-off-by: Nicolas Pitre <nico@fluxnic.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/arm/kernel/machine_kexec.c b/arch/arm/kernel/machine_kexec.c
index 30ead135ff5f..e59bbd496c39 100644
--- a/arch/arm/kernel/machine_kexec.c
+++ b/arch/arm/kernel/machine_kexec.c
@@ -75,6 +75,11 @@ void machine_crash_shutdown(struct pt_regs *regs)
         printk(KERN_INFO "Loading crashdump kernel...\n");
 }
 
+/*
+ * Function pointer to optional machine-specific reinitialization
+ */
+void (*kexec_reinit)(void);
+
 void machine_kexec(struct kimage *image)
 {
         unsigned long page_list;
@@ -104,6 +109,8 @@ void machine_kexec(struct kimage *image)
                            (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
         printk(KERN_INFO "Bye!\n");
 
+        if (kexec_reinit)
+                kexec_reinit();
         local_irq_disable();
         local_fiq_disable();
         setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/