linux.git/mm/mlock.c, branch v4.1

mm: move mm_populate()-related code to mm/gup.c

2015-04-14T23:49:00+00:00

It's odd that we have populate_vma_page_range() and __mm_populate() in
mm/mlock.c.  It's implementation of generic memory population and mlocking
is one of possible side effect, if VM_LOCKED is set.

__get_user_pages() is core of the implementation.  Let's move the code
into mm/gup.c.

Signed-off-by: Kirill A. Shutemov 
Acked-by: Linus Torvalds 
Acked-by: David Rientjes 
Cc: Michel Lespinasse 
Cc: Rik van Riel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: move gup() -> posix mlock() error conversion out of __mm_populate

2015-04-14T23:49:00+00:00

This is praparation to moving mm_populate()-related code out of
mm/mlock.c.

Signed-off-by: Kirill A. Shutemov 
Acked-by: Linus Torvalds 
Acked-by: David Rientjes 
Cc: Michel Lespinasse 
Cc: Rik van Riel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: rename __mlock_vma_pages_range() to populate_vma_page_range()

2015-04-14T23:49:00+00:00

__mlock_vma_pages_range() doesn't necessarily mlock pages.  It depends on
vma flags.  The same codepath is used for MAP_POPULATE.

Let's rename __mlock_vma_pages_range() to populate_vma_page_range().

This patch also drops mlock_vma_pages_range() references from
documentation.  It has gone in cea10a19b797 ("mm: directly use
__mlock_vma_pages_range() in find_extend_vma()").

Signed-off-by: Kirill A. Shutemov 
Acked-by: Linus Torvalds 
Acked-by: David Rientjes 
Cc: Michel Lespinasse 
Cc: Rik van Riel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: rename FOLL_MLOCK to FOLL_POPULATE

2015-04-14T23:48:59+00:00

After commit a1fde08c74e9 ("VM: skip the stack guard page lookup in
get_user_pages only for mlock") FOLL_MLOCK has lost its original
meaning: we don't necessarily mlock the page if the flags is set -- we
also take VM_LOCKED into consideration.

Since we use the same codepath for __mm_populate(), let's rename
FOLL_MLOCK to FOLL_POPULATE.

Signed-off-by: Kirill A. Shutemov 
Acked-by: Linus Torvalds 
Acked-by: David Rientjes 
Cc: Michel Lespinasse 
Cc: Rik van Riel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: reorder can_do_mlock to fix audit denial

2015-03-13T01:46:08+00:00

A userspace call to mmap(MAP_LOCKED) may result in the successful locking
of memory while also producing a confusing audit log denial.  can_do_mlock
checks capable and rlimit.  If either of these return positive
can_do_mlock returns true.  The capable check leads to an LSM hook used by
apparmour and selinux which produce the audit denial.  Reordering so
rlimit is checked first eliminates the denial on success, only recording a
denial when the lock is unsuccessful as a result of the denial.

Signed-off-by: Jeff Vander Stoep 
Acked-by: Nick Kralevich 
Cc: Jeff Vander Stoep 
Cc: Sasha Levin 
Cc: "Paul E. McKenney" 
Cc: Rik van Riel 
Cc: Vlastimil Babka 
Cc: Paul Cassella 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-10-13T13:44:12+00:00

Pull RCU updates from Ingo Molnar:
 "The main changes in this cycle were:

   - changes related to No-CBs CPUs and NO_HZ_FULL

   - RCU-tasks implementation

   - torture-test updates

   - miscellaneous fixes

   - locktorture updates

   - RCU documentation updates"

* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (81 commits)
  workqueue: Use cond_resched_rcu_qs macro
  workqueue: Add quiescent state between work items
  locktorture: Cleanup header usage
  locktorture: Cannot hold read and write lock
  locktorture: Fix __acquire annotation for spinlock irq
  locktorture: Support rwlocks
  rcu: Eliminate deadlock between CPU hotplug and expedited grace periods
  locktorture: Document boot/module parameters
  rcutorture: Rename rcutorture_runnable parameter
  locktorture: Add test scenario for rwsem_lock
  locktorture: Add test scenario for mutex_lock
  locktorture: Make torture scripting account for new _runnable name
  locktorture: Introduce torture context
  locktorture: Support rwsems
  locktorture: Add infrastructure for torturing read locks
  torture: Address race in module cleanup
  locktorture: Make statistics generic
  locktorture: Teach about lock debugging
  locktorture: Support mutexes
  locktorture: Add documentation
  ...

mm: use VM_BUG_ON_MM where possible

2014-10-10T02:25:58+00:00

Dump the contents of the relevant struct_mm when we hit the bug condition.

Signed-off-by: Sasha Levin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: convert a few VM_BUG_ON callers to VM_BUG_ON_VMA

2014-10-10T02:25:57+00:00

Trivially convert a few VM_BUG_ON calls to VM_BUG_ON_VMA to extract
more information when they trigger.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Sasha Levin 
Reviewed-by: Naoya Horiguchi 
Cc: Kirill A. Shutemov 
Cc: Konstantin Khlebnikov 
Cc: Rik van Riel 
Cc: Mel Gorman 
Cc: Michal Hocko 
Cc: Hugh Dickins 
Cc: Vlastimil Babka 
Cc: Michel Lespinasse 
Cc: Minchan Kim 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

rcu: Provide cond_resched_rcu_qs() to force quiescent states in long loops

2014-09-07T23:27:20+00:00

RCU-tasks requires the occasional voluntary context switch
from CPU-bound in-kernel tasks.  In some cases, this requires
instrumenting cond_resched().  However, there is some reluctance
to countenance unconditionally instrumenting cond_resched() (see
http://lwn.net/Articles/603252/), so this commit creates a separate
cond_resched_rcu_qs() that may be used in place of cond_resched() in
locations prone to long-duration in-kernel looping.

This commit currently instruments only RCU-tasks.  Future possibilities
include also instrumenting RCU, RCU-bh, and RCU-sched in order to reduce
IPI usage.

Signed-off-by: Paul E. McKenney

mm: describe mmap_sem rules for __lock_page_or_retry() and callers

2014-08-07T01:01:20+00:00

Add a comment describing the circumstances in which
__lock_page_or_retry() will or will not release the mmap_sem when
returning 0.

Add comments to lock_page_or_retry()'s callers (filemap_fault(),
do_swap_page()) noting the impact on VM_FAULT_RETRY returns.

Add comments on up the call tree, particularly replacing the false "We
return with mmap_sem still held" comments.

Signed-off-by: Paul Cassella 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds