From: Matthew Wilcox <willy@infradead.org>
To: hui yang <yanghui.def@gmail.com>
Cc: akpm@linux-foundation.org, linux-mm@kvack.org
Subject: Re: [PATCH 26/26] mm page_fault: Reduce code complexity
Date: Wed, 27 May 2020 10:13:53 -0700 [thread overview]
Message-ID: <20200527171353.GM17206@bombadil.infradead.org> (raw)
In-Reply-To: <1590575610-4546-1-git-send-email-yanghui.def@gmail.com>
On Wed, May 27, 2020 at 06:33:30PM +0800, hui yang wrote:
> if pte_alloc_one fail alloc a page, do_fault_around will return 0.
> and in do_read_fault()->__do_fault(), it also pte_alloc_one a page.
> if pte_alloc_one failed to alloc a page,it will return VM_FAULT_OOM.
> To reduce code complexity,if alloc failed we return VM_FAULT_OOM.
This doesn't reduce code complexity at all. You've made this error
different from every other error handled by this function because now
it returns directly instead of jumping to 'out:'. I can't understand
your explanation, and at first glance I'm not even sure this patch is
correct. Definitely not a simplification, so NAK with this justification.
The patch might be correct, but it'll need a lot better prose than this.
prev parent reply other threads:[~2020-05-27 17:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-27 10:33 [PATCH 26/26] mm page_fault: Reduce code complexity hui yang
2020-05-27 17:13 ` Matthew Wilcox [this message]
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