From: Ashok Raj Date: Fri, 9 Sep 2005 20:01:53 +0000 (-0700) Subject: [PATCH] x86_64: Don't call enforce_max_cpus when hotplug is enabled X-Git-Tag: firefly_0821_release~41614 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=092c948811359d8715790af0eedefc7dff1cd619;p=firefly-linux-kernel-4.4.55.git [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 Acked-by: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/x86_64/kernel/smpboot.c b/arch/x86_64/kernel/smpboot.c index 90aeccd15190..4fb34b5cb1f9 100644 --- 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