Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755768AbbLDNHR (ORCPT ); Fri, 4 Dec 2015 08:07:17 -0500 Received: from mx1.redhat.com ([209.132.183.28]:33119 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751901AbbLDNHP (ORCPT ); Fri, 4 Dec 2015 08:07:15 -0500 From: Igor Mammedov To: linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, konrad.wilk@oracle.com, imammedo@redhat.com, akataria@vmware.com, fujita.tomonori@lab.ntt.co.jp, revers@redhat.com, riel@redhat.com, pbonzini@redhat.com Subject: [PATCH v3 1/2] x86: introduce max_possible_pfn Date: Fri, 4 Dec 2015 14:07:05 +0100 Message-Id: <1449234426-273049-2-git-send-email-imammedo@redhat.com> In-Reply-To: <1449234426-273049-1-git-send-email-imammedo@redhat.com> References: <1449234426-273049-1-git-send-email-imammedo@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2914 Lines: 95 max_possible_pfn will be used for tracking max possible PFN for memory that isn't present in E820 table and could be hotplugged later. By default max_possible_pfn is initialized with max_pfn, but later it could be updated with highest PFN of hotpluggable memory ranges declared in ACPI SRAT table if any present. Signed-off-by: Igor Mammedov --- v3: - make 'max_possible_pfn' 64-bit - simplify condition to oneliner as suggested by Ingo --- arch/x86/kernel/setup.c | 2 ++ arch/x86/mm/srat.c | 2 ++ include/linux/bootmem.h | 4 ++++ mm/bootmem.c | 1 + mm/nobootmem.c | 1 + 5 files changed, 10 insertions(+) diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 29db25f..16a8465 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -1048,6 +1048,8 @@ void __init setup_arch(char **cmdline_p) if (mtrr_trim_uncached_memory(max_pfn)) max_pfn = e820_end_of_ram_pfn(); + max_possible_pfn = max_pfn; + #ifdef CONFIG_X86_32 /* max_low_pfn get updated here */ find_low_pfn_range(); diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c index c2aea63..b5f8218 100644 --- a/arch/x86/mm/srat.c +++ b/arch/x86/mm/srat.c @@ -203,6 +203,8 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma) pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n", (unsigned long long)start, (unsigned long long)end - 1); + max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1)); + return 0; out_err_bad_srat: bad_srat(); diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h index f589222..35b22f9 100644 --- a/include/linux/bootmem.h +++ b/include/linux/bootmem.h @@ -19,6 +19,10 @@ extern unsigned long min_low_pfn; * highest page */ extern unsigned long max_pfn; +/* + * highest possible page + */ +extern unsigned long long max_possible_pfn; #ifndef CONFIG_NO_BOOTMEM /* diff --git a/mm/bootmem.c b/mm/bootmem.c index 3b63807..91e32bc 100644 --- a/mm/bootmem.c +++ b/mm/bootmem.c @@ -33,6 +33,7 @@ EXPORT_SYMBOL(contig_page_data); unsigned long max_low_pfn; unsigned long min_low_pfn; unsigned long max_pfn; +unsigned long long max_possible_pfn; bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata; diff --git a/mm/nobootmem.c b/mm/nobootmem.c index e57cf24..99feb2b 100644 --- a/mm/nobootmem.c +++ b/mm/nobootmem.c @@ -31,6 +31,7 @@ EXPORT_SYMBOL(contig_page_data); unsigned long max_low_pfn; unsigned long min_low_pfn; unsigned long max_pfn; +unsigned long long max_possible_pfn; static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align, u64 goal, u64 limit) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/