Gerald Schaefer 28093f9f34 numa: fix /proc/<pid>/numa_maps for THP ... In gather_pte_stats() a THP pmd is cast into a pte, which is wrong because the layouts may differ depending on the architecture. On s390 this will lead to inaccurate numa_maps accounting in /proc because of misguided pte_present() and pte_dirty() checks on the fake pte. On other architectures pte_present() and pte_dirty() may work by chance, but there may be an issue with direct-access (dax) mappings w/o underlying struct pages when HAVE_PTE_SPECIAL is set and THP is available. In vm_normal_page() the fake pte will be checked with pte_special() and because there is no "special" bit in a pmd, this will always return false and the VM_PFNMAP | VM_MIXEDMAP checking will be skipped. On dax mappings w/o struct pages, an invalid struct page pointer would then be returned that can crash the kernel. This patch fixes the numa_maps THP handling by introducing new "_pmd" variants of the can_gather_numa_stats() and vm_normal_page() functions. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Jerome Marchand <jmarchan@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com> Cc: <stable@vger.kernel.org> [4.3+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-04-28 19:34:04 -07:00
..
array.c	ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-01-20 17:09:18 -08:00
base.c	proc/base: make prompt shell start from new line after executing "cat /proc/$pid/wchan"	2016-03-17 15:09:34 -07:00
cmdline.c
consoles.c
cpuinfo.c
devices.c
fd.c	proc: add a reschedule point in proc_readfd_common()	2016-01-09 02:56:10 -05:00
fd.h
generic.c	proc: change proc_subdir_lock to a rwlock	2015-09-10 13:29:01 -07:00
inode.c	kmemcg: account certain kmem allocations to memcg	2016-01-14 16:00:49 -08:00
internal.h
interrupts.c
Kconfig	fs, proc: add help for CONFIG_PROC_CHILDREN	2015-07-17 16:39:52 -07:00
kcore.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
kmsg.c
loadavg.c
Makefile
meminfo.c	mm/page_alloc.c: calculate 'available' memory in a separate function	2016-03-17 15:09:34 -07:00
namespaces.c	cgroup: introduce cgroup namespaces	2016-02-16 13:04:58 -05:00
nommu.c
page.c	/proc/kpageflags: return KPF_SLAB for slab tail pages	2016-03-17 15:09:34 -07:00
proc_net.c
proc_sysctl.c	fs: Drop unlikely before IS_ERR(_OR_NULL)	2015-09-29 15:13:58 +02:00
proc_tty.c
root.c	vfs: Commit to never having exectuables on proc and sysfs.	2015-07-10 10:39:25 -05:00
self.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
softirqs.c
stat.c
task_mmu.c	numa: fix /proc/<pid>/numa_maps for THP	2016-04-28 19:34:04 -07:00
task_nommu.c	proc: revert /proc/<pid>/maps [stack:TID] annotation	2016-02-03 08:28:43 -08:00
thread_self.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
uptime.c
version.c
vmcore.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00