linux-kernel - Re: [PATCH 4/4] mm/memory: convert do_read

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Message-ID: <ZKNalsGGwdXWLGSO@casper.infradead.org>
Date:   Tue, 4 Jul 2023 00:32:38 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Sidhartha Kumar <sidhartha.kumar@...cle.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org
Subject: Re: [PATCH 4/4] mm/memory: convert do_read_fault() to use folios

On Sun, Jul 02, 2023 at 10:58:50PM -0700, Sidhartha Kumar wrote:
> +++ b/mm/memory.c
> @@ -4528,6 +4528,7 @@ static inline bool should_fault_around(struct vm_fault *vmf)
>  static vm_fault_t do_read_fault(struct vm_fault *vmf)
>  {
>  	vm_fault_t ret = 0;
> +	struct folio *folio = page_folio(vmf->page);

Similarly, vmf->page is not initialised until after __do_fault().