From 214e270b5f5f6a85400a817d5305c797b2b7467a Mon Sep 17 00:00:00 2001 From: Alexander Gordeev Date: Thu, 14 Jun 2012 09:50:27 +0200 Subject: [PATCH] x86/apic/es7000+summit: Always make valid apicid from a cpumask In case of invalid parameters cpu_mask_to_apicid_and() might return apicid value of 0 (on Summit) or a uninitialized value (on ES7000), although it is supposed to return apicid of cpu-0 at least. Fix the operation to always return a valid apicid. Signed-off-by: Alexander Gordeev Cc: Suresh Siddha Cc: Yinghai Lu Link: http://lkml.kernel.org/r/20120614075026.GH3383@dhcp-26-207.brq.redhat.com Signed-off-by: Ingo Molnar --- arch/x86/kernel/apic/es7000_32.c | 2 ++ arch/x86/kernel/apic/summit_32.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c index 0c1347df3ad0..9882093f26e8 100644 --- a/arch/x86/kernel/apic/es7000_32.c +++ b/arch/x86/kernel/apic/es7000_32.c @@ -545,6 +545,8 @@ es7000_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id) apicid = new_apicid; round++; } + if (!round) + return -EINVAL; *dest_id = apicid; return 0; } diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c index e6cc1829f7c8..b6e61857c29f 100644 --- a/arch/x86/kernel/apic/summit_32.c +++ b/arch/x86/kernel/apic/summit_32.c @@ -282,6 +282,8 @@ summit_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id) apicid |= new_apicid; round++; } + if (!round) + return -EINVAL; *dest_id = apicid; return 0; } -- 2.20.1