netdev - Re: [PATCH v2 1/6] mm: introduce vma->vm

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Message-ID: <Y9F19QEDX5d/44EV@casper.infradead.org>
Date:   Wed, 25 Jan 2023 18:33:25 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Suren Baghdasaryan <surenb@...gle.com>
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Subject: Re: [PATCH v2 1/6] mm: introduce vma->vm_flags modifier functions

On Wed, Jan 25, 2023 at 12:38:46AM -0800, Suren Baghdasaryan wrote:
> +/* Use when VMA is not part of the VMA tree and needs no locking */
> +static inline void init_vm_flags(struct vm_area_struct *vma,
> +				 unsigned long flags)
> +{
> +	vma->vm_flags = flags;

vm_flags are supposed to have type vm_flags_t.  That's not been
fully realised yet, but perhaps we could avoid making it worse?

>  	pgprot_t vm_page_prot;
> -	unsigned long vm_flags;		/* Flags, see mm.h. */
> +
> +	/*
> +	 * Flags, see mm.h.
> +	 * WARNING! Do not modify directly.
> +	 * Use {init|reset|set|clear|mod}_vm_flags() functions instead.
> +	 */
> +	unsigned long vm_flags;

Including changing this line to vm_flags_t