From mboxrd@z Thu Jan 1 00:00:00 1970 From: wangkefeng.wang@huawei.com (Kefeng Wang) Date: Tue, 9 Aug 2016 10:30:49 +0800 Subject: [PATCH v3] arm64: Support hard limit of cpu count by nr_cpus In-Reply-To: <9b1b28bb-3102-d6f1-2989-ae764d340527@arm.com> References: <9b1b28bb-3102-d6f1-2989-ae764d340527@arm.com> Message-ID: <1470709849-22859-1-git-send-email-wangkefeng.wang@huawei.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Enable the hard limit of cpu count by set boot options nr_cpus=x on arm64, and make a minor change about message when total number of cpu exceeds the limit. Reviewed-by: Suzuki K Poulose Reported-by: Shiyuan Hu Signed-off-by: Kefeng Wang --- Change since v2: - change the warning message suggested-by Suzuki, and Suzuki's reviewed-by Change since v1: - clip cpu number in smp_init_cpus suggested-by Will and Suzuki, and update the warning. arch/arm64/kernel/smp.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 76a6d92..d93d433 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -661,9 +661,9 @@ void __init smp_init_cpus(void) acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT, acpi_parse_gic_cpu_interface, 0); - if (cpu_count > NR_CPUS) - pr_warn("no. of cores (%d) greater than configured maximum of %d - clipping\n", - cpu_count, NR_CPUS); + if (cpu_count > nr_cpu_ids) + pr_warn("Number of cores (%d) exceeds configured maximum of %d - clipping\n", + cpu_count, nr_cpu_ids); if (!bootcpu_valid) { pr_err("missing boot CPU MPIDR, not enabling secondaries\n"); @@ -677,7 +677,7 @@ void __init smp_init_cpus(void) * with entries in cpu_logical_map while initializing the cpus. * If the cpu set-up fails, invalidate the cpu_logical_map entry. */ - for (i = 1; i < NR_CPUS; i++) { + for (i = 1; i < nr_cpu_ids; i++) { if (cpu_logical_map(i) != INVALID_HWID) { if (smp_cpu_setup(i)) cpu_logical_map(i) = INVALID_HWID; -- 1.7.12.4