Correct nr_processes() when CPUs have been unplugged

[safe/jmp/linux-2.6] / kernel / kexec.c

diff --git a/kernel/kexec.c b/kernel/kexec.c
index aef2653..f336e21 100644 (file)
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -30,6 +30,7 @@
 #include <linux/pm.h>
 #include <linux/cpu.h>
 #include <linux/console.h>
+#include <linux/vmalloc.h>
 
 #include <asm/page.h>
 #include <asm/uaccess.h>
@@ -41,7 +42,7 @@
 note_buf_t* crash_notes;
 
 /* vmcoreinfo stuff */
-unsigned char vmcoreinfo_data[VMCOREINFO_BYTES];
+static unsigned char vmcoreinfo_data[VMCOREINFO_BYTES];
 u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
 size_t vmcoreinfo_size;
 size_t vmcoreinfo_max_size = sizeof(vmcoreinfo_data);
@@ -933,9 +934,8 @@ struct kimage *kexec_crash_image;
 
 static DEFINE_MUTEX(kexec_mutex);
 
-asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments,
-                               struct kexec_segment __user *segments,
-                               unsigned long flags)
+SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
+               struct kexec_segment __user *, segments, unsigned long, flags)
 {
        struct kimage **dest_image, *image;
        int result;
@@ -1115,7 +1115,7 @@ void crash_save_cpu(struct pt_regs *regs, int cpu)
        struct elf_prstatus prstatus;
        u32 *buf;
 
-       if ((cpu < 0) || (cpu >= NR_CPUS))
+       if ((cpu < 0) || (cpu >= nr_cpu_ids))
                return;
 
        /* Using ELF notes here is opportunistic.
@@ -1130,7 +1130,7 @@ void crash_save_cpu(struct pt_regs *regs, int cpu)
                return;
        memset(&prstatus, 0, sizeof(prstatus));
        prstatus.pr_pid = current->pid;
-       elf_core_copy_regs(&prstatus.pr_reg, regs);
+       elf_core_copy_kernel_regs(&prstatus.pr_reg, regs);
        buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS,
                              &prstatus, sizeof(prstatus));
        final_note(buf);
@@ -1228,7 +1228,7 @@ static int __init parse_crashkernel_mem(char                      *cmdline,
        } while (*cur++ == ',');
 
        if (*crash_size > 0) {
-               while (*cur != ' ' && *cur != '@')
+               while (*cur && *cur != ' ' && *cur != '@')
                        cur++;
                if (*cur == '@') {
                        cur++;
@@ -1371,6 +1371,7 @@ static int __init crash_save_vmcoreinfo_init(void)
        VMCOREINFO_SYMBOL(node_online_map);
        VMCOREINFO_SYMBOL(swapper_pg_dir);
        VMCOREINFO_SYMBOL(_stext);
+       VMCOREINFO_SYMBOL(vmlist);
 
 #ifndef CONFIG_NEED_MULTIPLE_NODES
        VMCOREINFO_SYMBOL(mem_map);
@@ -1406,7 +1407,9 @@ static int __init crash_save_vmcoreinfo_init(void)
        VMCOREINFO_OFFSET(free_area, free_list);
        VMCOREINFO_OFFSET(list_head, next);
        VMCOREINFO_OFFSET(list_head, prev);
+       VMCOREINFO_OFFSET(vm_struct, addr);
        VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
+       log_buf_kexec_setup();
        VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
        VMCOREINFO_NUMBER(NR_FREE_PAGES);
        VMCOREINFO_NUMBER(PG_lru);
@@ -1445,22 +1448,25 @@ int kernel_kexec(void)
                        goto Restore_console;
                }
                suspend_console();
-               error = device_suspend(PMSG_FREEZE);
+               error = dpm_suspend_start(PMSG_FREEZE);
                if (error)
                        goto Resume_console;
-               error = disable_nonboot_cpus();
-               if (error)
-                       goto Resume_devices;
-               device_pm_lock();
-               local_irq_disable();
-               /* At this point, device_suspend() has been called,
-                * but *not* device_power_down(). We *must*
-                * device_power_down() now.  Otherwise, drivers for
+               /* At this point, dpm_suspend_start() has been called,
+                * but *not* dpm_suspend_noirq(). We *must* call
+                * dpm_suspend_noirq() now.  Otherwise, drivers for
                 * some devices (e.g. interrupt controllers) become
                 * desynchronized with the actual state of the
                 * hardware at resume time, and evil weirdness ensues.
                 */
-               error = device_power_down(PMSG_FREEZE);
+               error = dpm_suspend_noirq(PMSG_FREEZE);
+               if (error)
+                       goto Resume_devices;
+               error = disable_nonboot_cpus();
+               if (error)
+                       goto Enable_cpus;
+               local_irq_disable();
+               /* Suspend system devices */
+               error = sysdev_suspend(PMSG_FREEZE);
                if (error)
                        goto Enable_irqs;
        } else
@@ -1475,13 +1481,14 @@ int kernel_kexec(void)
 
 #ifdef CONFIG_KEXEC_JUMP
        if (kexec_image->preserve_context) {
-               device_power_up(PMSG_RESTORE);
+               sysdev_resume();
  Enable_irqs:
                local_irq_enable();
-               device_pm_unlock();
+ Enable_cpus:
                enable_nonboot_cpus();
+               dpm_resume_noirq(PMSG_RESTORE);
  Resume_devices:
-               device_resume(PMSG_RESTORE);
+               dpm_resume_end(PMSG_RESTORE);
  Resume_console:
                resume_console();
                thaw_processes();