From: Dan Williams <dan.j.williams@intel.com>
To: akpm@linux-foundation.org
Cc: toshi.kani@hpe.com, Mel Gorman <mgorman@techsingularity.net>,
linux-kernel@vger.kernel.org,
Stephen Bates <stephen.bates@microsemi.com>,
linux-mm@kvack.org, Johannes Weiner <hannes@cmpxchg.org>,
Logan Gunthorpe <logang@deltatee.com>,
Vlastimil Babka <vbabka@suse.cz>
Subject: [PATCH v2 04/11] mm: cleanup sparse_init_one_section() return value
Date: Thu, 08 Dec 2016 18:41:15 -0800 [thread overview]
Message-ID: <148125127569.13512.1723769542125375411.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
In-Reply-To: <148125125407.13512.1253904589564772668.stgit@dwillia2-desk3.amr.corp.intel.com>
We mark and check that the section is present under a spin_lock() in
sparse_add_one_section(), so the lock ensures it will not change between
those 2 events. Also, we do not check the -EBUSY return value in
sparse_init(). Just make sparse_init_one_section() return void and clean
up the error handling.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Stephen Bates <stephen.bates@microsemi.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
mm/sparse.c | 21 ++++++---------------
1 file changed, 6 insertions(+), 15 deletions(-)
diff --git a/mm/sparse.c b/mm/sparse.c
index 91e1908db23d..59966a3e8ff0 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -231,19 +231,14 @@ struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pn
return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum);
}
-static int __meminit sparse_init_one_section(struct mem_section *ms,
+static void __meminit sparse_init_one_section(struct mem_section *ms,
unsigned long pnum, struct page *mem_map,
struct mem_section_usage *usage)
{
- if (!present_section(ms))
- return -EINVAL;
-
ms->section_mem_map &= ~SECTION_MAP_MASK;
ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) |
SECTION_HAS_MEM_MAP;
ms->usage = usage;
-
- return 1;
}
unsigned long usemap_size(void)
@@ -690,11 +685,6 @@ static void free_map_bootmem(struct page *memmap)
#endif /* CONFIG_MEMORY_HOTREMOVE */
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
-/*
- * returns the number of sections whose mem_maps were properly
- * set. If this is <=0, then that means that the passed-in
- * map was not consumed and must be freed.
- */
int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn)
{
unsigned long section_nr = pfn_to_section_nr(start_pfn);
@@ -725,7 +715,7 @@ int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn)
ms = __pfn_to_section(start_pfn);
if (ms->section_mem_map & SECTION_MARKED_PRESENT) {
- ret = -EEXIST;
+ ret = -EBUSY;
goto out;
}
@@ -733,15 +723,16 @@ int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn)
ms->section_mem_map |= SECTION_MARKED_PRESENT;
- ret = sparse_init_one_section(ms, section_nr, memmap, usage);
+ sparse_init_one_section(ms, section_nr, memmap, usage);
out:
pgdat_resize_unlock(pgdat, &flags);
- if (ret <= 0) {
+ if (ret < 0 && ret != -EEXIST) {
kfree(usage);
__kfree_section_memmap(memmap);
+ return ret;
}
- return ret;
+ return 0;
}
#ifdef CONFIG_MEMORY_HOTREMOVE
next prev parent reply other threads:[~2016-12-09 2:45 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-09 2:40 [PATCH v2 00/11] mm: sub-section memory hotplug support Dan Williams
2016-12-09 2:40 ` [PATCH v2 01/11] mm, devm_memremap_pages: use multi-order radix for ZONE_DEVICE lookups Dan Williams
2016-12-09 2:41 ` [PATCH v2 02/11] mm: introduce struct mem_section_usage to track partial population of a section Dan Williams
2016-12-09 2:41 ` [PATCH v2 03/11] mm: introduce common definitions for the size and mask " Dan Williams
2016-12-09 2:41 ` Dan Williams [this message]
2016-12-09 2:41 ` [PATCH v2 05/11] mm: track active portions of a section at boot Dan Williams
2016-12-09 2:41 ` [PATCH v2 06/11] mm: fix register_new_memory() zone type detection Dan Williams
2016-12-09 2:41 ` [PATCH v2 07/11] mm: convert kmalloc_section_memmap() to populate_section_memmap() Dan Williams
2016-12-09 2:41 ` [PATCH v2 08/11] mm: prepare for hot-{add, remove} of sub-section ranges Dan Williams
2016-12-09 2:41 ` [PATCH v2 09/11] mm: support section-unaligned ZONE_DEVICE memory ranges Dan Williams
2016-12-09 2:41 ` [PATCH v2 10/11] mm: enable section-unaligned devm_memremap_pages() Dan Williams
2016-12-09 2:41 ` [PATCH v2 11/11] libnvdimm, pfn, dax: stop padding pmem namespaces to section alignment Dan Williams
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