From 6de421198c75d95088331e6a480e952292b0e121 Mon Sep 17 00:00:00 2001 From: Baoquan He Date: Fri, 12 Aug 2016 14:57:13 +0800 Subject: [PATCH] x86/apic, ACPI: Remove the repeated lapic address override entry parsing The ACPI MADT has a 32-bit field providing lapic address at which each processor can access its lapic information. MADT also contains an optional entry to provide a 64-bit address to override the 32-bit one. However the current code does the lapic address override entry parsing twice. One is in early_acpi_boot_init() because AMD NUMA need get boot_cpu_id earlier. The other is in acpi_boot_init() which parses all MADT entries. So in this patch we remove the repeated code in the 2nd part. Meanwhile print lapic override entry information like other MADT entry, this will be added to boot log. This patch is not supposed to change any runtime behavior, other than improving kernel messages. Signed-off-by: Baoquan He Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Josh Poimboeuf Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-acpi@vger.kernel.org Cc: rjw@rjwysocki.net Link: http://lkml.kernel.org/r/1470985033-22493-2-git-send-email-bhe@redhat.com Signed-off-by: Ingo Molnar --- arch/x86/kernel/acpi/boot.c | 17 ++--------------- arch/x86/kernel/apic/apic.c | 2 +- 2 files changed, 3 insertions(+), 16 deletions(-) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 90d84c3eee53..2087bea6b461 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -282,6 +282,8 @@ acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header, if (BAD_MADT_ENTRY(lapic_addr_ovr, end)) return -EINVAL; + acpi_table_print_madt_entry(header); + acpi_lapic_addr = lapic_addr_ovr->address; return 0; @@ -998,21 +1000,6 @@ static int __init acpi_parse_madt_lapic_entries(void) if (!boot_cpu_has(X86_FEATURE_APIC)) return -ENODEV; - /* - * Note that the LAPIC address is obtained from the MADT (32-bit value) - * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value). - */ - - count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, - acpi_parse_lapic_addr_ovr, 0); - if (count < 0) { - printk(KERN_ERR PREFIX - "Error parsing LAPIC address override entry\n"); - return count; - } - - register_lapic_address(acpi_lapic_addr); - count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, acpi_parse_sapic, MAX_LOCAL_APIC); diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index cea4fc19e844..63b748444880 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1825,7 +1825,7 @@ void __init register_lapic_address(unsigned long address) if (!x2apic_mode) { set_fixmap_nocache(FIX_APIC_BASE, address); apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n", - APIC_BASE, mp_lapic_addr); + APIC_BASE, address); } if (boot_cpu_physical_apicid == -1U) { boot_cpu_physical_apicid = read_apic_id(); -- 2.20.1