Re: [PATCH] mm/vmalloc: Fix regression caused by needless vmalloc_sync_all()

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On Wed, Nov 13, 2019 at 05:55:30PM +0800, Shile Zhang wrote:
> +#if defined(CONFIG_X86_32) && defined(CONFIG_X86_PAE)
>  	/*
>  	 * First make sure the mappings are removed from all page-tables
>  	 * before they are freed.
> +	 *
> +	 * This is only needed on x86-32 with !SHARED_KERNEL_PMD, which is
> +	 * the case on a PAE kernel with PTI enabled.
>  	 */
> -	vmalloc_sync_all();
> +	if (!SHARED_KERNEL_PMD && boot_cpu_has(X86_FEATURE_PTI))
> +		vmalloc_sync_all();
> +#endif

I already submitted another fix for this quite some time ago:

	https://lore.kernel.org/lkml/20191009124418.8286-1-joro@xxxxxxxxxx/

Regards,

	Joerg





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