linux-kernel - Re: [PATCH] mm: fix unexpected changes to {failslab|fail_page

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Message-ID: <Y2j9Q/yMmqgPPUoO@nvidia.com>
Date:   Mon, 7 Nov 2022 08:42:43 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Qi Zheng <zhengqi.arch@...edance.com>
Cc:     dvyukov@...gle.com, willy@...radead.org, akinobu.mita@...il.com,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] mm: fix unexpected changes to
 {failslab|fail_page_alloc}.attr

On Mon, Nov 07, 2022 at 11:31:09AM +0800, Qi Zheng wrote:

> @@ -31,9 +33,9 @@ bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags)
>  		return false;
>  
>  	if (gfpflags & __GFP_NOWARN)
> -		failslab.attr.no_warn = true;
> +		flags |= FAULT_NOWARN;

You should add a comment here about why this is required, to avoid
deadlocking printk

Jason