ARM: 7098/1: kdump: copy kernel relocation code at the kexec prepare stage
Lei Wen [Fri, 23 Sep 2011 08:04:09 +0000 (09:04 +0100)]
This copy really don't need to do at the very second before the kernel
would crash.

Signed-off-by: Lei Wen <leiwen@marvell.com>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/machine_kexec.c

index e59bbd4..c1b4463 100644 (file)
@@ -32,6 +32,24 @@ static atomic_t waiting_for_crash_ipi;
 
 int machine_kexec_prepare(struct kimage *image)
 {
+       unsigned long page_list;
+       void *reboot_code_buffer;
+       page_list = image->head & PAGE_MASK;
+
+       reboot_code_buffer = page_address(image->control_code_page);
+
+       /* Prepare parameters for reboot_code_buffer*/
+       kexec_start_address = image->start;
+       kexec_indirection_page = page_list;
+       kexec_mach_type = machine_arch_type;
+       kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
+
+       /* copy our kernel relocation code to the control code page */
+       memcpy(reboot_code_buffer,
+              relocate_new_kernel, relocate_new_kernel_size);
+
+       flush_icache_range((unsigned long) reboot_code_buffer,
+                          (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
        return 0;
 }
 
@@ -82,31 +100,14 @@ void (*kexec_reinit)(void);
 
 void machine_kexec(struct kimage *image)
 {
-       unsigned long page_list;
        unsigned long reboot_code_buffer_phys;
        void *reboot_code_buffer;
 
-
-       page_list = image->head & PAGE_MASK;
-
        /* we need both effective and real address here */
        reboot_code_buffer_phys =
            page_to_pfn(image->control_code_page) << PAGE_SHIFT;
        reboot_code_buffer = page_address(image->control_code_page);
 
-       /* Prepare parameters for reboot_code_buffer*/
-       kexec_start_address = image->start;
-       kexec_indirection_page = page_list;
-       kexec_mach_type = machine_arch_type;
-       kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
-
-       /* copy our kernel relocation code to the control code page */
-       memcpy(reboot_code_buffer,
-              relocate_new_kernel, relocate_new_kernel_size);
-
-
-       flush_icache_range((unsigned long) reboot_code_buffer,
-                          (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
        printk(KERN_INFO "Bye!\n");
 
        if (kexec_reinit)