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Tue, 20 Aug 2024 09:51:38 +0800 From: zhangchun To: CC: , , , , Subject: [PATCH] use might_sleep check if kmap_high is called from atomic context Date: Tue, 20 Aug 2024 09:53:11 +0800 Message-ID: <1724118791-51554-1-git-send-email-zhang.chuna@h3c.com> X-Mailer: git-send-email 1.8.3.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.99.206.13] X-ClientProxiedBy: BJSMTP02-EX.srv.huawei-3com.com (10.63.20.133) To DAG6EX09-BJD.srv.huawei-3com.com (10.153.34.11) X-DNSRBL: X-MAIL:h3cspam02-ex.h3c.com 47K1pcAO049571 X-Rspam-User: X-Stat-Signature: qguc7j3zggjtynqmz8c9pxomxhtyn4ha X-Rspamd-Queue-Id: 0168980009 X-Rspamd-Server: rspam11 X-HE-Tag: 1724118752-710850 X-HE-Meta: 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 Lw29kXtO dq2822I77AzmgjAIj1eAJNLxb1/ZuDrqGGMvgJl4ddrrrA3qABLuOM6S5kHIJGO5LN9iuLXbsOJD99tGfSnKTjVEbKCdQJos0tJw1Ni2hYSKQPDMFNRf5VCXRR0r8RLT7uhQNP340lnl/XZ+gYlPeoXZGpQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: kmap_high is defined as EXPORT_SYMBOL, and cannot be called from atomic context. Add might_sleep check is necessary. Signed-off-by: zhangchun --- mm/highmem.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mm/highmem.c b/mm/highmem.c index 07f2c67..5cfb5a9 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -319,6 +319,11 @@ void *kmap_high(struct page *page) unsigned long vaddr; /* + * Use might_sleep to check if kmap_high is called + * from atomic context. + */ + might_sleep(); + /* * For highmem pages, we can't trust "virtual" until * after we have the lock. */ -- 1.8.3.1