From: Igor Mammedov Date: Fri, 4 Dec 2015 13:07:05 +0000 (+0100) Subject: x86/mm: Introduce max_possible_pfn X-Git-Tag: v4.1.12-117.0_27200813_3~313 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=21307257377486fb63423153537d8d5ad81a5423;p=users%2Fjedix%2Flinux-maple.git x86/mm: Introduce max_possible_pfn 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 Cc: Andrew Morton Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: akataria@vmware.com Cc: fujita.tomonori@lab.ntt.co.jp Cc: konrad.wilk@oracle.com Cc: pbonzini@redhat.com Cc: revers@redhat.com Cc: riel@redhat.com Link: http://lkml.kernel.org/r/1449234426-273049-2-git-send-email-imammedo@redhat.com Signed-off-by: Ingo Molnar (cherry picked from commit 8dd3303001976aa8583bf20f6b93590c74114308) Signed-off-by: Vijay Balakrishna Reviewed-by: Jane Chu Reviewed-by: Konrad Rzeszutek Wilk Orabug: 26754302 --- diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 1dbf403f8d4d..98ab1e8a85d3 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -1067,6 +1067,8 @@ 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 66338a60aa6e..feabfe189a66 100644 --- a/arch/x86/mm/srat.c +++ b/arch/x86/mm/srat.c @@ -202,6 +202,8 @@ 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 0995c2de8162..2a11b4024c03 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 a23dd1934654..b2f132409cc4 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 4bea539921df..349f2117e827 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)