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Date: Thu, 25 Dec 2008 14:46:12 -0800
From: "Yinghai Lu" <yinghai@...nel.org>
To: "Rusty Russell" <rusty@...tcorp.com.au>
Cc: "Ingo Molnar" <mingo@...e.hu>, "Hugh Dickins" <hugh@...itas.com>,
"Stephen Rothwell" <sfr@...b.auug.org.au>,
"Andrew Morton" <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org
Subject: Re: linux-next: parsing mem=700M broken
On Thu, Dec 25, 2008 at 3:40 AM, Rusty Russell <rusty@...tcorp.com.au> wrote:
> On Wednesday 24 December 2008 18:39:04 Yinghai Lu wrote:
>> for cpu caps on boot cpu setup still need
>
> OK, how about these? I cleaned up description a little, and put
> it in own function.
looks good.
YH
>
> Subject: [PATCH] x86: clean up setup_clear/force_cpu_cap handling
> From: Yinghai Lu <yinghai.lu@...nel.org>
>
> Impact: fix and cleanup
>
> setup_force_cpu_cap() only has one user (xen) but it should not reuse
> cleared_cpu_cpus. It will have problems for smp.
>
> Need to have cpu_cpus_set array too, and need to combine it before
> we AND into boot_cpu_data.x86_capability.
>
> Signed-off-by: Yinghai Lu <yinghai.lu@...nel.org>
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> ---
> arch/x86/include/asm/cpufeature.h | 4 ++--
> arch/x86/include/asm/processor.h | 3 ++-
> arch/x86/kernel/cpu/common.c | 17 ++++++++++++-----
> 3 files changed, 16 insertions(+), 8 deletions(-)
>
> diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
> --- a/arch/x86/include/asm/cpufeature.h
> +++ b/arch/x86/include/asm/cpufeature.h
> @@ -188,11 +188,11 @@ extern const char * const x86_power_flag
> #define clear_cpu_cap(c, bit) clear_bit(bit, (unsigned long *)((c)->x86_capability))
> #define setup_clear_cpu_cap(bit) do { \
> clear_cpu_cap(&boot_cpu_data, bit); \
> - set_bit(bit, (unsigned long *)cleared_cpu_caps); \
> + set_bit(bit, (unsigned long *)cpu_caps_cleared); \
> } while (0)
> #define setup_force_cpu_cap(bit) do { \
> set_cpu_cap(&boot_cpu_data, bit); \
> - clear_bit(bit, (unsigned long *)cleared_cpu_caps); \
> + set_bit(bit, (unsigned long *)cpu_caps_set); \
> } while (0)
>
> #define cpu_has_fpu boot_cpu_has(X86_FEATURE_FPU)
> diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
> --- a/arch/x86/include/asm/processor.h
> +++ b/arch/x86/include/asm/processor.h
> @@ -130,7 +130,8 @@ extern struct cpuinfo_x86 new_cpu_data;
> extern struct cpuinfo_x86 new_cpu_data;
>
> extern struct tss_struct doublefault_tss;
> -extern __u32 cleared_cpu_caps[NCAPINTS];
> +extern __u32 cpu_caps_cleared[NCAPINTS];
> +extern __u32 cpu_caps_set[NCAPINTS];
>
> #ifdef CONFIG_SMP
> DECLARE_PER_CPU(struct cpuinfo_x86, cpu_info);
> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -219,7 +219,8 @@ static char __cpuinit *table_lookup_mode
> return NULL; /* Not found */
> }
>
> -__u32 cleared_cpu_caps[NCAPINTS] __cpuinitdata;
> +__u32 cpu_caps_cleared[NCAPINTS] __cpuinitdata;
> +__u32 cpu_caps_set[NCAPINTS] __cpuinitdata;
>
> /* Current gdt points %fs at the "master" per-cpu area: after this,
> * it's on the real one. */
> @@ -512,6 +513,16 @@ static void __cpuinit identify_cpu_witho
> #endif
> }
>
> +static void __cpuinit override_capabilities(u32 x86_capability[])
> +{
> + unsigned int i;
> +
> + for (i = 0; i < NCAPINTS; i++) {
> + x86_capability[i] &= ~cpu_caps_cleared[i];
> + x86_capability[i] |= cpu_caps_set[i];
> + }
> +}
> +
> /*
> * Do minimum CPU detection early.
> * Fields really needed: vendor, cpuid_level, family, model, mask,
> @@ -703,6 +714,9 @@ static void __cpuinit identify_cpu(struc
> detect_ht(c);
> #endif
>
> + /* Command-line override before we AND into smp all cpus cap. */
> + override_capabilities(c->x86_capability);
> +
> /*
> * On SMP, boot_cpu_data holds the common feature set between
> * all CPUs; so make sure that we indicate which features are
> @@ -714,10 +728,6 @@ static void __cpuinit identify_cpu(struc
> for (i = 0; i < NCAPINTS; i++)
> boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
> }
> -
> - /* Clear all flags overriden by options */
> - for (i = 0; i < NCAPINTS; i++)
> - c->x86_capability[i] &= ~cleared_cpu_caps[i];
>
> #ifdef CONFIG_X86_MCE
> /* Init Machine Check Exception if available. */
>
>
> Subject: x86: override_capabilities in early_identify_cpu
> From: Rusty Russell <rusty@...tcorp.com.au>
>
> Impact: future-proof
>
> This does nothing at the moment, but once early_param() are parsed before
> setup_arch, it will ensure we respect commandline overrides on the boot
> cpu's capabilities.
>
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Yinghai Lu <yinghai.lu@...nel.org>
>
> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -559,6 +559,8 @@ static void __init early_identify_cpu(st
>
> if (this_cpu->c_early_init)
> this_cpu->c_early_init(c);
> +
> + override_capabilities(c->x86_capability);
>
> validate_pat_support(c);
>
> --
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