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Date: Mon, 24 Mar 2008 15:34:49 -0700
From: "Yinghai Lu" <yhlu.kernel@...il.com>
To: "Jack Steiner" <steiner@....com>
Cc: mingo@...e.hu, tglx@...utronix.de, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: Re: [RFC 1/8] x86_64: Change GET_APIC_ID() from an inline function to an out-of-line function
On Mon, Mar 24, 2008 at 11:21 AM, Jack Steiner <steiner@....com> wrote:
>
> Change GET_APIC_ID() on x86_64 from an inline function to an
> out-of-line function. The function is rarely called and the
> additional overhead is negligible.
>
> This change is in preparation for additional changes to
> the APICID functions that will come in a later patch.
>
> Signed-off-by: Jack Steiner <steiner@....com>
>
> ---
> arch/x86/kernel/apic_64.c | 2 +-
> arch/x86/kernel/genapic_64.c | 5 +++++
> arch/x86/kernel/genapic_flat_64.c | 2 +-
> arch/x86/kernel/io_apic_64.c | 4 ++--
> arch/x86/kernel/mpparse_64.c | 2 +-
> arch/x86/kernel/smpboot_64.c | 6 +++---
> include/asm-x86/apic.h | 1 +
> include/asm-x86/apicdef.h | 1 -
> include/asm-x86/smp_64.h | 2 +-
> 9 files changed, 15 insertions(+), 10 deletions(-)
>
> Index: linux/arch/x86/kernel/apic_64.c
> ===================================================================
> --- linux.orig/arch/x86/kernel/apic_64.c 2008-03-18 14:54:19.000000000 -0500
> +++ linux/arch/x86/kernel/apic_64.c 2008-03-20 15:30:23.000000000 -0500
> @@ -885,7 +885,7 @@ void __init init_apic_mappings(void)
> * Fetch the APIC ID of the BSP in case we have a
> * default configuration (or the MP table is broken).
> */
> - boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID));
> + boot_cpu_id = get_apic_id();
> }
>
> /*
> Index: linux/arch/x86/kernel/genapic_64.c
> ===================================================================
> --- linux.orig/arch/x86/kernel/genapic_64.c 2008-03-18 14:54:19.000000000 -0500
> +++ linux/arch/x86/kernel/genapic_64.c 2008-03-21 09:13:41.000000000 -0500
> @@ -64,3 +64,8 @@ void send_IPI_self(int vector)
> {
> __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
> }
> +
> +unsigned int get_apic_id(void)
> +{
> + return (apic_read(APIC_ID) >> 24) & 0xFFu;
> +}
> Index: linux/arch/x86/kernel/genapic_flat_64.c
> ===================================================================
> --- linux.orig/arch/x86/kernel/genapic_flat_64.c 2008-03-18 14:54:19.000000000 -0500
> +++ linux/arch/x86/kernel/genapic_flat_64.c 2008-03-20 15:30:23.000000000 -0500
> @@ -97,7 +97,7 @@ static void flat_send_IPI_all(int vector
>
> static int flat_apic_id_registered(void)
> {
> - return physid_isset(GET_APIC_ID(apic_read(APIC_ID)), phys_cpu_present_map);
> + return physid_isset(get_apic_id(), phys_cpu_present_map);
> }
>
> static unsigned int flat_cpu_mask_to_apicid(cpumask_t cpumask)
> Index: linux/arch/x86/kernel/io_apic_64.c
> ===================================================================
> --- linux.orig/arch/x86/kernel/io_apic_64.c 2008-03-18 14:54:19.000000000 -0500
> +++ linux/arch/x86/kernel/io_apic_64.c 2008-03-21 09:07:19.000000000 -0500
> @@ -1067,7 +1067,7 @@ void __apicdebuginit print_local_APIC(vo
> printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
> smp_processor_id(), hard_smp_processor_id());
> v = apic_read(APIC_ID);
> - printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(v));
> + printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, get_apic_id());
> v = apic_read(APIC_LVR);
> printk(KERN_INFO "... APIC VERSION: %08x\n", v);
> ver = GET_APIC_VERSION(v);
> @@ -1261,7 +1261,7 @@ void disable_IO_APIC(void)
> entry.dest_mode = 0; /* Physical */
> entry.delivery_mode = dest_ExtINT; /* ExtInt */
> entry.vector = 0;
> - entry.dest = GET_APIC_ID(apic_read(APIC_ID));
> + entry.dest = get_apic_id();
>
> /*
> * Add it to the IO-APIC irq-routing table:
> Index: linux/arch/x86/kernel/mpparse_64.c
> ===================================================================
> --- linux.orig/arch/x86/kernel/mpparse_64.c 2008-03-18 14:54:19.000000000 -0500
> +++ linux/arch/x86/kernel/mpparse_64.c 2008-03-21 09:07:23.000000000 -0500
> @@ -614,7 +614,7 @@ void __init mp_register_lapic_address(u6
> mp_lapic_addr = (unsigned long) address;
> set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
> if (boot_cpu_id == -1U)
> - boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID));
> + boot_cpu_id = get_apic_id();
> }
>
> void __cpuinit mp_register_lapic (u8 id, u8 enabled)
> Index: linux/arch/x86/kernel/smpboot_64.c
> ===================================================================
> --- linux.orig/arch/x86/kernel/smpboot_64.c 2008-03-18 14:54:19.000000000 -0500
> +++ linux/arch/x86/kernel/smpboot_64.c 2008-03-21 09:07:19.000000000 -0500
> @@ -158,7 +158,7 @@ void __cpuinit smp_callin(void)
> /*
> * (This works even if the APIC is not enabled.)
> */
> - phys_id = GET_APIC_ID(apic_read(APIC_ID));
> + phys_id = get_apic_id();
> cpuid = smp_processor_id();
> if (cpu_isset(cpuid, cpu_callin_map)) {
> panic("smp_callin: phys CPU#%d, CPU#%d already present??\n",
> @@ -878,9 +878,9 @@ void __init smp_prepare_cpus(unsigned in
> enable_IO_APIC();
> end_local_APIC_setup();
>
> - if (GET_APIC_ID(apic_read(APIC_ID)) != boot_cpu_id) {
> + if (get_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);
> + get_apic_id(), boot_cpu_id);
> /* Or can we switch back to PIC here? */
> }
>
> Index: linux/include/asm-x86/apic.h
> ===================================================================
> --- linux.orig/include/asm-x86/apic.h 2008-03-18 14:54:19.000000000 -0500
> +++ linux/include/asm-x86/apic.h 2008-03-21 09:07:59.000000000 -0500
> @@ -129,6 +129,7 @@ extern void enable_NMI_through_LVT0(void
> */
> #ifdef CONFIG_X86_64
> extern void setup_apic_routing(void);
> +extern unsigned int get_apic_id(void);
> #endif
>
> extern u8 setup_APIC_eilvt_mce(u8 vector, u8 msg_type, u8 mask);
> Index: linux/include/asm-x86/apicdef.h
> ===================================================================
> --- linux.orig/include/asm-x86/apicdef.h 2008-03-18 14:54:19.000000000 -0500
> +++ linux/include/asm-x86/apicdef.h 2008-03-21 09:07:23.000000000 -0500
> @@ -14,7 +14,6 @@
>
> #ifdef CONFIG_X86_64
> # define APIC_ID_MASK (0xFFu<<24)
> -# define GET_APIC_ID(x) (((x)>>24)&0xFFu)
> # define SET_APIC_ID(x) (((x)<<24))
> #endif
it this patch after smpboot.c integration?
that patchsets have GET_APIC_ID in mach_apicdef.h instead of apicdef.h
YH
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