x86/apic: Fix num_processors value in case of failure

If the topology package map check of the APIC ID and the CPU is a failure,
we don't generate the processor info for that APIC ID yet we increase
disabled_cpus by one - which is buggy.

Only increase num_processors once we are sure we don't fail.

Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1473214893-16481-1-git-send-email-douly.fnst@cn.fujitsu.com
[ Rewrote the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 50c95af0f017d7ab73a5cad5dc226b1bf5d9cf60..f3e9b2df4b165d9d1a31322960778a2e9ef68bf3 100644 (file)
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2093,7 +2093,6 @@ int generic_processor_info(int apicid, int version)
                return -EINVAL;
        }
 
-       num_processors++;
        if (apicid == boot_cpu_physical_apicid) {
                /*
                 * x86_bios_cpu_apicid is required to have processors listed
@@ -2116,10 +2115,13 @@ int generic_processor_info(int apicid, int version)
 
                pr_warning("APIC: Package limit reached. Processor %d/0x%x ignored.\n",
                           thiscpu, apicid);
+
                disabled_cpus++;
                return -ENOSPC;
        }
 
+       num_processors++;
+
        /*
         * Validate version
         */