x86: make early printk selectable on 64-bit as well

Enable CONFIG_EMBEDDED to select CONFIG_EARLY_PRINTK on 64-bit as well.

saves ~2K:

   text    data     bss     dec     hex filename
   7290283 3672091 1907848 12870222         c4624e vmlinux.before
   7288373 3671795 1907848 12868016         c459b0 vmlinux.after

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

3 files changed, 14 insertions, 2 deletions

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 15854b53badc..88420af98140 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -6,7 +6,7 @@ config TRACE_IRQFLAGS_SUPPORT
 source "lib/Kconfig.debug"
 
 config EARLY_PRINTK
-        bool "Early printk" if EMBEDDED && DEBUG_KERNEL && X86_32
+        bool "Early printk" if EMBEDDED
         default y
         help
           Write kernel log output directly into the VGA buffer or to a serial
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 85c1e6bf8022..87e031d4abf1 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -58,8 +58,13 @@ void __init x86_64_start_kernel(char * real_mode_data)
         /* Make NULL pointers segfault */
         zap_identity_mappings();
 
-        for (i = 0; i < IDT_ENTRIES; i++)
+        for (i = 0; i < IDT_ENTRIES; i++) {
+#ifdef CONFIG_EARLY_PRINTK
                 set_intr_gate(i, &early_idt_handlers[i]);
+#else
+                set_intr_gate(i, early_idt_handler);
+#endif
+        }
         load_idt((const struct desc_ptr *)&idt_descr);
 
         early_printk("Kernel alive\n");
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 8b4c35cb519a..1d5a7a361200 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -267,6 +267,7 @@ init_rsp:
 bad_address:
         jmp bad_address
 
+#ifdef CONFIG_EARLY_PRINTK
 .macro early_idt_tramp first, last
         .ifgt \last-\first
         early_idt_tramp \first, \last-1
@@ -281,8 +282,10 @@ early_idt_handlers:
         early_idt_tramp 64, 127
         early_idt_tramp 128, 191
         early_idt_tramp 192, 255
+#endif
 
 ENTRY(early_idt_handler)
+#ifdef CONFIG_EARLY_PRINTK
         cmpl $2,early_recursion_flag(%rip)
         jz  1f
         incl early_recursion_flag(%rip)
@@ -311,8 +314,11 @@ ENTRY(early_idt_handler)
         movq 8(%rsp),%rsi       # get rip again
         call __print_symbol
 #endif
+#endif /* EARLY_PRINTK */
 1:      hlt
         jmp 1b
+
+#ifdef CONFIG_EARLY_PRINTK
 early_recursion_flag:
         .long 0
 
@@ -320,6 +326,7 @@ early_idt_msg:
         .asciz "PANIC: early exception %02lx rip %lx:%lx error %lx cr2 %lx\n"
 early_idt_ripmsg:
         .asciz "RIP %s\n"
+#endif /* CONFIG_EARLY_PRINTK */
 
 .balign PAGE_SIZE