From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: + mm-sparsemem-get-address-to-page-struct-instead-of-address-to-pfn.patch added to -mm tree Date: Sun, 09 Feb 2020 17:35:49 -0800 Message-ID: <20200210013549.b7iS7M4xH%akpm@linux-foundation.org> References: <20200203173311.6269a8be06a05e5a4aa08a93@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.29.99]:36520 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726207AbgBJBfu (ORCPT ); Sun, 9 Feb 2020 20:35:50 -0500 In-Reply-To: <20200203173311.6269a8be06a05e5a4aa08a93@linux-foundation.org> Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: bhe@redhat.com, dan.j.williams@intel.com, david@redhat.com, mm-commits@vger.kernel.org, richardw.yang@linux.intel.com The patch titled Subject: mm/sparsemem: get address to page struct instead of address to pfn has been added to the -mm tree. Its filename is mm-sparsemem-get-address-to-page-struct-instead-of-address-to-pfn.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-sparsemem-get-address-to-page-struct-instead-of-address-to-pfn.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-sparsemem-get-address-to-page-struct-instead-of-address-to-pfn.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: Wei Yang Subject: mm/sparsemem: get address to page struct instead of address to pfn memmap should be the address to page struct instead of address to pfn. As mentioned by David, if system memory and devmem sit within a section, the mismatch address would lead kdump to dump unexpected memory. Since sub-section only works for SPARSEMEM_VMEMMAP, pfn_to_page() is valid to get the page struct address at this point. Link: http://lkml.kernel.org/r/20200210005048.10437-1-richardw.yang@linux.intel.com Fixes: ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug") Signed-off-by: Wei Yang Cc: Dan Williams Cc: David Hildenbrand Cc: Baoquan He Signed-off-by: Andrew Morton --- mm/sparse.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/sparse.c~mm-sparsemem-get-address-to-page-struct-instead-of-address-to-pfn +++ a/mm/sparse.c @@ -884,7 +884,7 @@ int __meminit sparse_add_section(int nid /* Align memmap to section boundary in the subsection case */ if (section_nr_to_pfn(section_nr) != start_pfn) - memmap = pfn_to_kaddr(section_nr_to_pfn(section_nr)); + memmap = pfn_to_page(section_nr_to_pfn(section_nr)); sparse_init_one_section(ms, section_nr, memmap, ms->usage, 0); return 0; _ Patches currently in -mm which might be from richardw.yang@linux.intel.com are mm-sparsemem-get-address-to-page-struct-instead-of-address-to-pfn.patch