AuxXxilium/linux_dsm_epyc7002
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ddffe98d16
linux_dsm_epyc7002/arch/x86/mm
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Yasuaki Ishimatsu ddffe98d16 mm/memory_hotplug: set magic number to page->freelist instead of page->lru.next 
To identify that pages of page table are allocated from bootmem
allocator, magic number sets to page->lru.next.

But page->lru list is initialized in reserve_bootmem_region().  So when
calling free_pagetable(), the function cannot find the magic number of
pages.  And free_pagetable() frees the pages by free_reserved_page() not
put_page_bootmem().

But if the pages are allocated from bootmem allocator and used as page
table, the pages have private flag.  So before freeing the pages, we
should clear the private flag by put_page_bootmem().

Before applying the commit 7bfec6f47b ("mm, page_alloc: check multiple
page fields with a single branch"), we could find the following visible
issue:

  BUG: Bad page state in process kworker/u1024:1
  page:ffffea103cfd8040 count:0 mapcount:0 mappi
  flags: 0x6fffff80000800(private)
  page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
  bad because of flags: 0x800(private)
  <snip>
  Call Trace:
  [...] dump_stack+0x63/0x87
  [...] bad_page+0x114/0x130
  [...] free_pages_prepare+0x299/0x2d0
  [...] free_hot_cold_page+0x31/0x150
  [...] __free_pages+0x25/0x30
  [...] free_pagetable+0x6f/0xb4
  [...] remove_pagetable+0x379/0x7ff
  [...] vmemmap_free+0x10/0x20
  [...] sparse_remove_one_section+0x149/0x180
  [...] __remove_pages+0x2e9/0x4f0
  [...] arch_remove_memory+0x63/0xc0
  [...] remove_memory+0x8c/0xc0
  [...] acpi_memory_device_remove+0x79/0xa5
  [...] acpi_bus_trim+0x5a/0x8d
  [...] acpi_bus_trim+0x38/0x8d
  [...] acpi_device_hotplug+0x1b7/0x418
  [...] acpi_hotplug_work_fn+0x1e/0x29
  [...] process_one_work+0x152/0x400
  [...] worker_thread+0x125/0x4b0
  [...] kthread+0xd8/0xf0
  [...] ret_from_fork+0x22/0x40

And the issue still silently occurs.

Until freeing the pages of page table allocated from bootmem allocator,
the page->freelist is never used.  So the patch sets magic number to
page->freelist instead of page->lru.next.

[isimatu.yasuaki@jp.fujitsu.com: fix merge issue]
  Link: http://lkml.kernel.org/r/722b1cc4-93ac-dd8b-2be2-7a7e313b3b0b@gmail.com
Link: http://lkml.kernel.org/r/2c29bd9f-5b67-02d0-18a3-8828e78bbb6f@gmail.com
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Xishi Qiu <qiuxishi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-02-22 16:41:29 -08:00
..
kmemcheck
amdtopology.c
debug_pagetables.c
dump_pagetables.c x86/mm/ptdump: Add address marker for KASAN shadow region 2017-02-16 19:53:25 +01:00
extable.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
fault.c x86/mm: Drop unused argument 'removed' from sync_global_pgds() 2016-12-15 12:46:07 +01:00
gup.c mm: replace get_user_pages_unlocked() write/force parameters with gup_flags 2016-10-18 14:13:37 -07:00
highmem_32.c
hugetlbpage.c
ident_map.c
init_32.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
init_64.c mm/memory_hotplug: set magic number to page->freelist instead of page->lru.next 2017-02-22 16:41:29 -08:00
init.c x86/e820: Use much less memory for e820/e820_saved, save up to 120k 2016-09-21 15:02:12 +02:00
iomap_32.c
ioremap.c
kasan_init_64.c
kaslr.c kconfig.h: remove config_enabled() macro 2016-10-27 18:43:43 -07:00
kmmio.c
Makefile
mm_internal.h
mmap.c
mmio-mod.c
mpx.c x86/mpx: Use compatible types in comparison to fix sparse error 2017-01-14 09:32:06 +01:00
numa_32.c
numa_64.c
numa_emulation.c
numa_internal.h
numa.c ACPI/NUMA: Do not map pxm to node when NUMA is turned off 2016-12-15 11:32:32 +01:00
pageattr-test.c
pageattr.c x86/mm/cpa: Avoid wbinvd() for PREEMPT 2017-01-30 15:33:52 +01:00
pat_internal.h
pat_rbtree.c x86/mm/pat: Use rb_entry() 2017-02-04 17:18:00 +01:00
pat.c x86/pat, mm: Make track_pfn_insert() return void 2016-11-09 21:36:07 +01:00
pf_in.c
pf_in.h
pgtable_32.c
pgtable.c
physaddr.c
physaddr.h
pkeys.c x86/fpu: Finish excising 'eagerfpu' 2016-10-18 09:56:03 +02:00
setup_nx.c
srat.c
testmmiotrace.c
tlb.c