From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: + mm-page_idlec-skip-offline-pages.patch added to -mm tree Date: Fri, 05 Jun 2020 18:06:29 -0700 Message-ID: <20200606010629.NBKqk1gCz%akpm@linux-foundation.org> References: <20200604164523.e15f3177f4b69dcb4f2534a1@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.29.99]:57792 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726803AbgFFBGb (ORCPT ); Fri, 5 Jun 2020 21:06:31 -0400 In-Reply-To: <20200604164523.e15f3177f4b69dcb4f2534a1@linux-foundation.org> Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: david@redhat.com, mm-commits@vger.kernel.org, pankaj.gupta.linux@gmail.com, sjpark@amazon.de The patch titled Subject: mm/page_idle.c: Skip offline pages has been added to the -mm tree. Its filename is mm-page_idlec-skip-offline-pages.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-page_idlec-skip-offline-pages.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_idlec-skip-offline-pages.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: SeongJae Park Subject: mm/page_idle.c: Skip offline pages 'Idle page tracking' users can pass random pfn that might be mapped to an offline page. To avoid accessing such pages, this commit modifies the 'page_idle_get_page()' to use 'pfn_to_online_page()' instead of 'pfn_valid()' and 'pfn_to_page()' combination, so that the pfn mapped to an offline page can be skipped. Link: http://lkml.kernel.org/r/20200605092502.18018-2-sjpark@amazon.com Signed-off-by: SeongJae Park Reported-by: David Hildenbrand Reviewed-by: David Hildenbrand Reviewed-by: Pankaj Gupta Signed-off-by: Andrew Morton --- mm/page_idle.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) --- a/mm/page_idle.c~mm-page_idlec-skip-offline-pages +++ a/mm/page_idle.c @@ -4,6 +4,7 @@ #include #include #include +#include #include #include #include @@ -30,13 +31,9 @@ */ static struct page *page_idle_get_page(unsigned long pfn) { - struct page *page; + struct page *page = pfn_to_online_page(pfn); pg_data_t *pgdat; - if (!pfn_valid(pfn)) - return NULL;