From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f200.google.com (mail-qk0-f200.google.com [209.85.220.200]) by kanga.kvack.org (Postfix) with ESMTP id EDF7E6B0003 for ; Thu, 28 Jun 2018 02:57:27 -0400 (EDT) Received: by mail-qk0-f200.google.com with SMTP id z10-v6so4772235qki.5 for ; Wed, 27 Jun 2018 23:57:27 -0700 (PDT) Received: from mx1.redhat.com (mx3-rdu2.redhat.com. [66.187.233.73]) by mx.google.com with ESMTPS id v50-v6si5887842qtc.125.2018.06.27.23.57.26 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 27 Jun 2018 23:57:26 -0700 (PDT) Date: Thu, 28 Jun 2018 14:57:22 +0800 From: Baoquan He Subject: Re: [PATCH v5 3/4] mm/sparse: Add a new parameter 'data_unit_size' for alloc_usemap_and_memmap Message-ID: <20180628065722.GB32539@MiWiFi-R3L-srv> References: <20180627013116.12411-1-bhe@redhat.com> <20180627013116.12411-4-bhe@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Pavel Tatashin Cc: LKML , Andrew Morton , dave.hansen@intel.com, pagupta@redhat.com, Linux Memory Management List , kirill.shutemov@linux.intel.com On 06/27/18 at 11:14pm, Pavel Tatashin wrote: > Honestly, I do not like this new agrument, but it will do for now. I > could not think of a better way without rewriting everything. > > Reviewed-by: Pavel Tatashin > > However, I will submit a series of patches to cleanup sparse.c and > completely remove large and confusing temporary buffers: map_map, and > usemap_map. In those patches, I will remove alloc_usemap_and_memmap(). Great, look forward to seeing them, I can help review. > On Tue, Jun 26, 2018 at 9:31 PM Baoquan He wrote: > > > > alloc_usemap_and_memmap() is passing in a "void *" that points to > > usemap_map or memmap_map. In next patch we will change both of the > > map allocation from taking 'NR_MEM_SECTIONS' as the length to taking > > 'nr_present_sections' as the length. After that, the passed in 'void*' > > needs to update as things get consumed. But, it knows only the > > quantity of objects consumed and not the type. This effectively > > tells it enough about the type to let it update the pointer as > > objects are consumed. > > > > Signed-off-by: Baoquan He > > --- > > mm/sparse.c | 10 +++++++--- > > 1 file changed, 7 insertions(+), 3 deletions(-) > > > > diff --git a/mm/sparse.c b/mm/sparse.c > > index 71ad53da2cd1..b2848cc6e32a 100644 > > --- a/mm/sparse.c > > +++ b/mm/sparse.c > > @@ -489,10 +489,12 @@ void __weak __meminit vmemmap_populate_print_last(void) > > /** > > * alloc_usemap_and_memmap - memory alloction for pageblock flags and vmemmap > > * @map: usemap_map for pageblock flags or mmap_map for vmemmap > > + * @unit_size: size of map unit > > */ > > static void __init alloc_usemap_and_memmap(void (*alloc_func) > > (void *, unsigned long, unsigned long, > > - unsigned long, int), void *data) > > + unsigned long, int), void *data, > > + int data_unit_size) > > { > > unsigned long pnum; > > unsigned long map_count; > > @@ -569,7 +571,8 @@ void __init sparse_init(void) > > if (!usemap_map) > > panic("can not allocate usemap_map\n"); > > alloc_usemap_and_memmap(sparse_early_usemaps_alloc_node, > > - (void *)usemap_map); > > + (void *)usemap_map, > > + sizeof(usemap_map[0])); > > > > #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER > > size2 = sizeof(struct page *) * NR_MEM_SECTIONS; > > @@ -577,7 +580,8 @@ void __init sparse_init(void) > > if (!map_map) > > panic("can not allocate map_map\n"); > > alloc_usemap_and_memmap(sparse_early_mem_maps_alloc_node, > > - (void *)map_map); > > + (void *)map_map, > > + sizeof(map_map[0])); > > #endif > > > > for_each_present_section_nr(0, pnum) { > > -- > > 2.13.6 > >