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charset=us-ascii Content-Disposition: inline In-Reply-To: <20200207041134.GC25537@MiWiFi-R3L-srv> User-Agent: NeoMutt/20170113 (1.7.2) 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: On Fri, Feb 07, 2020 at 12:11:34PM +0800, Baoquan He wrote: >On 02/07/20 at 07:16am, Wei Yang wrote: >> memmap should be the physical address to page struct instead of virtual >> address to pfn. > >Maybe not, memmap stores a virtual address. > >> >> Since we call this only for SPARSEMEM_VMEMMAP, pfn_to_page() is valid at >> this point. >> >> Fixes: ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug") >> Signed-off-by: Wei Yang >> CC: Dan Williams >> --- >> mm/sparse.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/mm/sparse.c b/mm/sparse.c >> index b5da121bdd6e..56816f653588 100644 >> --- a/mm/sparse.c >> +++ b/mm/sparse.c >> @@ -888,7 +888,7 @@ int __meminit sparse_add_section(int nid, unsigned long start_pfn, >> /* Align memmap to section boundary in the subsection case */ >> if (IS_ENABLED(CONFIG_SPARSEMEM_VMEMMAP) && >> 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)); > >With Dan's confirmation, sub-section is only valid in vmemmap case. I >think the old if (section_nr_to_pfn(section_nr) != start_pfn) is enough >to filter out non vmemmap case. So only below code is good: > > + memmap = pfn_to_page(section_nr_to_pfn(section_nr)); > You mean replace pfn_to_kaddr with pfn_to_page ? >> sparse_init_one_section(ms, section_nr, memmap, ms->usage, 0); >> >> return 0; >> -- >> 2.17.1 >> -- Wei Yang Help you, Help me