From: Christopher Lameter <cl@linux.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: Jia-Ju Bai <baijiaju1990@gmail.com>,
penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com,
akpm@linux-foundation.org, linux-mm@kvack.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Can kfree() sleep at runtime?
Date: Thu, 31 May 2018 14:30:29 +0000 [thread overview]
Message-ID: <01000163b69b6b62-6c5ac940-d6c1-419a-9dc9-697908020c53-000000@email.amazonses.com> (raw)
In-Reply-To: <20180531141452.GC30221@bombadil.infradead.org>
On Thu, 31 May 2018, Matthew Wilcox wrote:
> > Freeing a page in the page allocator also was traditionally not sleeping.
> > That has changed?
>
> No. "Your bug" being "The bug in your static analysis tool". It probably
> isn't following the data flow correctly (or deeply enough).
Well ok this is not going to trigger for kfree(), this is x86 specific and
requires CONFIG_DEBUG_PAGEALLOC and a free of a page in a huge page.
Ok that is a very contorted situation but how would a static checker deal
with that?
next prev parent reply other threads:[~2018-05-31 14:30 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-31 13:10 Jia-Ju Bai
2018-05-31 14:08 ` Matthew Wilcox
2018-05-31 14:12 ` Christopher Lameter
2018-05-31 14:14 ` Matthew Wilcox
2018-05-31 14:30 ` Christopher Lameter [this message]
2018-06-01 1:22 ` Jia-Ju Bai
2018-06-01 1:34 ` Nadav Amit
2018-06-01 1:12 ` Jia-Ju Bai
2018-05-31 14:09 ` Christopher Lameter
2018-06-01 1:18 ` Jia-Ju Bai
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