x86: apic: Allow noop operations to be called almost at any time

As only apic noop is used we allow to use almost any operation
caller wants (and which of them noop driver supports of
course).

Initially it was reported by Ingo Molnar that apic noop
issue a warning for pkg id (which is actually false positive
and should be eliminated).

So we save checking (and warning issue) for read/write
operations while allow any other ops to be freely used.

Also:
 - fix noop_cpu_to_logical_apicid, it should be 0.
 - rename noop_default_phys_pkg_id to noop_phys_pkg_id
   (we use default_ prefix for more general routines
    in apic subsystem).

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
LKML-Reference: <20091015150416.GC5331@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 61a5628810d..dce93d4b0ea 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -246,6 +246,7 @@ static int modern_apic(void)
  */
 void apic_disable(void)
 {
+	pr_info("APIC: switched to apic NOOP\n");
 	apic = &apic_noop;
 }