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Wed, 2 Sep 2026 21:06:10 +0800 (CST) Received: from kwepemk300003.china.huawei.com (unknown [7.202.195.93]) by mail.maildlp.com (Postfix) with ESMTPS id 71F94202E6; Wed, 2 Sep 2026 21:16:56 +0800 (CST) Received: from ubuntu (10.50.87.83) by kwepemk300003.china.huawei.com (7.202.195.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.45; Wed, 2 Sep 2026 21:16:55 +0800 From: Kefeng Wang To: , , , , , , , , , , , , , CC: , , , Kefeng Wang Subject: [PATCH 2/4] iomap: simplify writepages reclaim guard Date: Wed, 2 Sep 2026 21:16:51 +0800 Message-ID: <20260902131653.1338227-3-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260902131653.1338227-1-wangkefeng.wang@huawei.com> References: <20260902131653.1338227-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.50.87.83] X-ClientProxiedBy: kwepems500002.china.huawei.com (7.221.188.17) To kwepemk300003.china.huawei.com (7.202.195.93) X-Stat-Signature: zwfep9nwsufw5rt4ss33zm9hthsgwrrw X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 11EC3A0009 X-Rspam-User: X-HE-Tag: 1788355021-630764 X-HE-Meta: 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 PDR5HW/J dylXifWsIAw3dEf55pFfFe1+MIzlwWdl3ZKibO5o0SZYBpWl/qU1AALEDNsaMmFFZ1de9f7v6eDJk1jFom9OmsZ8caf29scw2uzdiU4g+9bHLK+k5HjGLjfjTUCjhWiLnqQpdF7FT00IW26skW3Dw2WXOvKzKVbWpoBJ3r7JYvq+PgDtvlDdIpr5Pi8tgXndTIp+RYPx0A16OIu0HFVAG/2uYKeBMeqQUlSOCHWMUd+tYefZ5YcifDemLw+rxnqzoPQGs4I1WoMzL9ijX7Fu+kxGaxpJZL7W6PvZW Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Now that kswapd can no longer reach filesystem writeback (pageout() returns PAGE_ACTIVATE for non-shmem, non-anon folios), any PF_MEMALLOC context in iomap_writepages() indicates a VM regression, simplify the check by removing PF_KSWAPD. Signed-off-by: Kefeng Wang --- fs/iomap/buffered-io.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 0a5ebfda90f1..6306ca747f3b 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -2077,8 +2077,7 @@ iomap_writepages(struct iomap_writepage_ctx *wpc) * Writeback from reclaim context should never happen except in the case * of a VM regression so warn about it and refuse to write the data. */ - if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC | PF_KSWAPD)) == - PF_MEMALLOC)) + if (WARN_ON_ONCE((current->flags & PF_MEMALLOC))) return -EIO; while ((folio = writeback_iter(mapping, wpc->wbc, folio, &error))) { -- 2.55.0