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Date: Fri, 21 Sep 2007 22:37:16 -0700
From: "Yinghai Lu" <yhlu.kernel@...il.com>
To: "Andi Kleen" <ak@...e.de>
Cc: patches@...-64.org, linux-kernel@...r.kernel.org
Subject: Re: [patches] [PATCH] [12/50] x86_64: Untable __init references between IO data
On 9/21/07, Andi Kleen <ak@...e.de> wrote:
>
> Earlier patch added IO APIC setup into local APIC setup. This caused
> modpost warnings. Fix them by untangling setup_local_APIC() and splitting
> it into smaller functions. The IO APIC initialization is only called
> for the BP init.
>
> Also removed some outdated debugging code and minor cleanup.
> Signed-off-by: Andi Kleen <ak@...e.de>
>
> ---
> arch/x86_64/kernel/apic.c | 46 ++++++++++++++++++++-----------------------
> arch/x86_64/kernel/smpboot.c | 8 +++++++
> include/asm-x86_64/apic.h | 1
> 3 files changed, 31 insertions(+), 24 deletions(-)
>
> Index: linux/arch/x86_64/kernel/apic.c
> ===================================================================
> --- linux.orig/arch/x86_64/kernel/apic.c
> +++ linux/arch/x86_64/kernel/apic.c
> @@ -323,7 +323,7 @@ void __init init_bsp_APIC(void)
>
> void __cpuinit setup_local_APIC (void)
> {
> - unsigned int value, maxlvt;
> + unsigned int value;
> int i, j;
>
> value = apic_read(APIC_LVR);
> @@ -417,33 +417,22 @@ void __cpuinit setup_local_APIC (void)
> else
> value = APIC_DM_NMI | APIC_LVT_MASKED;
> apic_write(APIC_LVT1, value);
> +}
>
> +void __cpuinit lapic_setup_esr(void)
static ?
> +{
> + unsigned maxlvt = get_maxlvt();
> + apic_write(APIC_LVTERR, ERROR_APIC_VECTOR);
> /*
> - * Now enable IO-APICs, actually call clear_IO_APIC
> - * We need clear_IO_APIC before enabling vector on BP
> + * spec says clear errors after enabling vector.
> */
> - if (!smp_processor_id())
> - if (!skip_ioapic_setup && nr_ioapics)
> - enable_IO_APIC();
> -
> - {
> - unsigned oldvalue;
> - maxlvt = get_maxlvt();
> - oldvalue = apic_read(APIC_ESR);
> - value = ERROR_APIC_VECTOR; // enables sending errors
> - apic_write(APIC_LVTERR, value);
> - /*
> - * spec says clear errors after enabling vector.
> - */
> - if (maxlvt > 3)
> - apic_write(APIC_ESR, 0);
> - value = apic_read(APIC_ESR);
> - if (value != oldvalue)
> - apic_printk(APIC_VERBOSE,
> - "ESR value after enabling vector: %08x, after %08x\n",
> - oldvalue, value);
> - }
> + if (maxlvt > 3)
> + apic_write(APIC_ESR, 0);
> +}
>
> +void __cpuinit end_local_APIC_setup(void)
> +{
> + lapic_setup_esr();
> nmi_watchdog_default();
> setup_apic_nmi_watchdog(NULL);
> apic_pm_activate();
> @@ -1178,6 +1167,15 @@ int __init APIC_init_uniprocessor (void)
>
> setup_local_APIC();
>
> + /*
> + * Now enable IO-APICs, actually call clear_IO_APIC
> + * We need clear_IO_APIC before enabling vector on BP
here it is uniprocessor...
so
+ * We need clear_IO_APIC before enabling error vector
> + */
> + if (!skip_ioapic_setup && nr_ioapics)
> + enable_IO_APIC();
could it cause modpost warning too?
> +
> + end_local_APIC_setup();
> +
> if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
> setup_IO_APIC();
> else
> Index: linux/arch/x86_64/kernel/smpboot.c
> ===================================================================
> --- linux.orig/arch/x86_64/kernel/smpboot.c
> +++ linux/arch/x86_64/kernel/smpboot.c
> @@ -211,6 +211,7 @@ void __cpuinit smp_callin(void)
>
> Dprintk("CALLIN, before setup_local_APIC().\n");
> setup_local_APIC();
> + end_local_APIC_setup();
>
> /*
> * Get our bogomips.
> @@ -870,6 +871,13 @@ void __init smp_prepare_cpus(unsigned in
> */
> setup_local_APIC();
>
> + /*
> + * Enable IO APIC before setting up error vector
> + */
> + if (!skip_ioapic_setup && nr_ioapics)
> + enable_IO_APIC();
> + end_local_APIC_setup();
> +
> if (GET_APIC_ID(apic_read(APIC_ID)) != boot_cpu_id) {
> panic("Boot APIC ID in local APIC unexpected (%d vs %d)",
> GET_APIC_ID(apic_read(APIC_ID)), boot_cpu_id);
> Index: linux/include/asm-x86_64/apic.h
> ===================================================================
> --- linux.orig/include/asm-x86_64/apic.h
> +++ linux/include/asm-x86_64/apic.h
> @@ -73,6 +73,7 @@ extern void cache_APIC_registers (void);
> extern void sync_Arb_IDs (void);
sync_Arb_IDs is still left there?
YH
-
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