[PATCH] x86_64: Don't call enforce_max_cpus when hotplug is enabled

enforce_max_cpus nukes out cpu_present_map and cpu_possible_map making it
impossible to add new cpus in the system.  Since it doesnt provide any
additional value apart this call and reference is removed.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Acked-by: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/x86_64/kernel/smpboot.c b/arch/x86_64/kernel/smpboot.c
index 90aeccd1519074c27b65524c6fa8bc601f0efb09..4fb34b5cb1f964e8093bc73bfd5219649a952efa 100644 (file)
--- a/arch/x86_64/kernel/smpboot.c
+++ b/arch/x86_64/kernel/smpboot.c
@@ -894,23 +894,6 @@ static __init void disable_smp(void)
        cpu_set(0, cpu_core_map[0]);
 }
 
-/*
- * Handle user cpus=... parameter.
- */
-static __init void enforce_max_cpus(unsigned max_cpus)
-{
-       int i, k;
-       k = 0;
-       for (i = 0; i < NR_CPUS; i++) {
-               if (!cpu_possible(i))
-                       continue;
-               if (++k > max_cpus) {
-                       cpu_clear(i, cpu_possible_map);
-                       cpu_clear(i, cpu_present_map);
-               }
-       }
-}
-
 #ifdef CONFIG_HOTPLUG_CPU
 /*
  * cpu_possible_map should be static, it cannot change as cpu's
@@ -999,8 +982,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
        current_cpu_data = boot_cpu_data;
        current_thread_info()->cpu = 0;  /* needed? */
 
-       enforce_max_cpus(max_cpus);
-
 #ifdef CONFIG_HOTPLUG_CPU
        prefill_possible_map();
 #endif