Re: [Intel-gfx] [PATCH 08/10] x86/cpufeature: Kill cpu_has_pat

[Daniel Vetter]

On Tue, Mar 29, 2016 at 05:42:01PM +0200, Borislav Petkov wrote:
> From: Borislav Petkov <bp@xxxxxxx>
> 
> Signed-off-by: Borislav Petkov <bp@xxxxxxx>
> Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx

Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

> ---
> 
> @tip guys, the pat_bsp_init() and pat_ap_init() hunk will conflict with
> 
>   d63dcf49cf5a ("x86/mm/pat: Replace cpu_has_pat with boot_cpu_has()")
> 
> in tip/x86:mm. Let me know how you wanna handle it. Or you can simply
> delete those hunks below when applying after merging the above branch.
> Or I can send this patch later... Yadda yadda.
> 
>  arch/x86/include/asm/cpufeature.h | 1 -
>  arch/x86/mm/pat.c                 | 4 ++--
>  drivers/gpu/drm/i915/i915_gem.c   | 2 +-
>  3 files changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
> index 5e02bc2e8444..ad480c5fb27c 100644
> --- a/arch/x86/include/asm/cpufeature.h
> +++ b/arch/x86/include/asm/cpufeature.h
> @@ -128,7 +128,6 @@ extern const char * const x86_bug_flags[NBUGINTS*32];
>  #define cpu_has_aes		boot_cpu_has(X86_FEATURE_AES)
>  #define cpu_has_avx		boot_cpu_has(X86_FEATURE_AVX)
>  #define cpu_has_avx2		boot_cpu_has(X86_FEATURE_AVX2)
> -#define cpu_has_pat		boot_cpu_has(X86_FEATURE_PAT)
>  #define cpu_has_xsave		boot_cpu_has(X86_FEATURE_XSAVE)
>  #define cpu_has_xsaves		boot_cpu_has(X86_FEATURE_XSAVES)
>  /*
> diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
> index faec01e7a17d..6df20ac83ec3 100644
> --- a/arch/x86/mm/pat.c
> +++ b/arch/x86/mm/pat.c
> @@ -202,7 +202,7 @@ static void pat_bsp_init(u64 pat)
>  {
>  	u64 tmp_pat;
>  
> -	if (!cpu_has_pat) {
> +	if (!boot_cpu_has(X86_FEATURE_PAT)) {
>  		pat_disable("PAT not supported by CPU.");
>  		return;
>  	}
> @@ -227,7 +227,7 @@ static void pat_ap_init(u64 pat)
>  	if (!pat_enabled())
>  		return;
>  
> -	if (!cpu_has_pat) {
> +	if (!boot_cpu_has(X86_FEATURE_PAT)) {
>  		/*
>  		 * If this happens we are on a secondary CPU, but switched to
>  		 * PAT on the boot CPU. We have no way to undo PAT.
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 3d31d3ac589e..aaec8aef9fd4 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -1732,7 +1732,7 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
>  	if (args->flags & ~(I915_MMAP_WC))
>  		return -EINVAL;
>  
> -	if (args->flags & I915_MMAP_WC && !cpu_has_pat)
> +	if (args->flags & I915_MMAP_WC && !boot_cpu_has(X86_FEATURE_PAT))
>  		return -ENODEV;
>  
>  	obj = drm_gem_object_lookup(dev, file, args->handle);
> -- 
> 2.7.3
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch