From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ch1outboundpool.messaging.microsoft.com (ch1ehsobe001.messaging.microsoft.com [216.32.181.181]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (Client CN "mail.global.frontbridge.com", Issuer "Microsoft Secure Server Authority" (not verified)) by ozlabs.org (Postfix) with ESMTPS id C3EEA2C0090 for ; Thu, 21 Mar 2013 11:06:23 +1100 (EST) Date: Wed, 20 Mar 2013 19:06:12 -0500 From: Scott Wood To: Subject: [PATCH] powerpc/mm/nohash: ignore NULL stale_map entries Message-ID: <20130321000612.GA5887@home.buserror.net> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: linuxppc-dev@lists.ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This happens with threads that are offline due to CPU hotplug (including threads that were never "plugged in" to begin with because SMT is disabled). Signed-off-by: Scott Wood --- arch/powerpc/mm/mmu_context_nohash.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/mm/mmu_context_nohash.c b/arch/powerpc/mm/mmu_context_nohash.c index e779642..810f8e4 100644 --- a/arch/powerpc/mm/mmu_context_nohash.c +++ b/arch/powerpc/mm/mmu_context_nohash.c @@ -112,8 +112,10 @@ static unsigned int steal_context_smp(unsigned int id) */ for_each_cpu(cpu, mm_cpumask(mm)) { for (i = cpu_first_thread_sibling(cpu); - i <= cpu_last_thread_sibling(cpu); i++) - __set_bit(id, stale_map[i]); + i <= cpu_last_thread_sibling(cpu); i++) { + if (stale_map[i]) + __set_bit(id, stale_map[i]); + } cpu = i - 1; } return id; @@ -272,7 +274,8 @@ void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next) /* XXX This clear should ultimately be part of local_flush_tlb_mm */ for (i = cpu_first_thread_sibling(cpu); i <= cpu_last_thread_sibling(cpu); i++) { - __clear_bit(id, stale_map[i]); + if (stale_map[i]) + __clear_bit(id, stale_map[i]); } } -- 1.7.9.5