KVM: SVM: Only save/restore MSRs when needed

[powerpc.git] / drivers / char / vt.c

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 94ce3e7..1bbb45b 100644 (file)
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -724,6 +724,7 @@ int vc_allocate(unsigned int currcons)      /* return 0 on success */
                return -ENOMEM;
            memset(vc, 0, sizeof(*vc));
            vc_cons[currcons].d = vc;
+           INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
            visual_init(vc, currcons, 1);
            if (!*vc->vc_uni_pagedir_loc)
                con_set_default_unimap(vc);
@@ -2185,10 +2186,28 @@ static void console_callback(struct work_struct *ignored)
        release_console_sem();
 }
 
-void set_console(int nr)
+int set_console(int nr)
 {
+       struct vc_data *vc = vc_cons[fg_console].d;
+
+       if (!vc_cons_allocated(nr) || vt_dont_switch ||
+               (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
+
+               /*
+                * Console switch will fail in console_callback() or
+                * change_console() so there is no point scheduling
+                * the callback
+                *
+                * Existing set_console() users don't check the return
+                * value so this shouldn't break anything
+                */
+               return -EINVAL;
+       }
+
        want_console = nr;
        schedule_console_callback();
+
+       return 0;
 }
 
 struct tty_driver *console_driver;
@@ -2635,6 +2654,7 @@ static int __init con_init(void)
         */
        for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
                vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
+               INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
                visual_init(vc, currcons, 1);
                vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
                vc->vc_kmalloced = 0;