Merge branch 'akpm' (patches from Andrew)

Merge updates from Andrew Morton:

 - a few misc things

 - a few Y2038 fixes

 - ntfs fixes

 - arch/sh tweaks

 - ocfs2 updates

 - most of MM

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (111 commits)
  mm/hmm.c: remove unused variables align_start and align_end
  fs/userfaultfd.c: remove redundant pointer uwq
  mm, vmacache: hash addresses based on pmd
  mm/list_lru: introduce list_lru_shrink_walk_irq()
  mm/list_lru.c: pass struct list_lru_node* as an argument to __list_lru_walk_one()
  mm/list_lru.c: move locking from __list_lru_walk_one() to its caller
  mm/list_lru.c: use list_lru_walk_one() in list_lru_walk_node()
  mm, swap: make CONFIG_THP_SWAP depend on CONFIG_SWAP
  mm/sparse: delete old sparse_init and enable new one
  mm/sparse: add new sparse_init_nid() and sparse_init()
  mm/sparse: move buffer init/fini to the common place
  mm/sparse: use the new sparse buffer functions in non-vmemmap
  mm/sparse: abstract sparse buffer allocations
  mm/hugetlb.c: don't zero 1GiB bootmem pages
  mm, page_alloc: double zone's batchsize
  mm/oom_kill.c: document oom_lock
  mm/hugetlb: remove gigantic page support for HIGHMEM
  mm, oom: remove sleep from under oom_lock
  kernel/dma: remove unsupported gfp_mask parameter from dma_alloc_from_contiguous()
  mm/cma: remove unsupported gfp_mask parameter from cma_alloc()
  ...

CREDITS

@@ -2571,6 +2571,11 @@ S: Helstorfer Str. 7
 S: D-30625 Hannover
 S: Germany
 
+N: Ron Minnich
+E: rminnich@sandia.gov
+E: rminnich@gmail.com
+D: 9p filesystem development
+
 N: Corey Minyard
 E: minyard@wf-rch.cirr.com
 E: minyard@mvista.com

Documentation/admin-guide/mm/idle_page_tracking.rst

@@ -65,6 +65,11 @@ workload one should:
     are not reclaimable, he or she can filter them out using
     ``/proc/kpageflags``.
 
+The page-types tool in the tools/vm directory can be used to assist in this.
+If the tool is run initially with the appropriate option, it will mark all the
+queried pages as idle.  Subsequent runs of the tool can then show which pages have
+their idle flag cleared in the interim.
+
 See :ref:`Documentation/admin-guide/mm/pagemap.rst <pagemap>` for more
 information about ``/proc/pid/pagemap``, ``/proc/kpageflags``, and
 ``/proc/kpagecgroup``.

Documentation/admin-guide/mm/pagemap.rst

@@ -44,6 +44,9 @@ There are four components to pagemap:
  * ``/proc/kpagecount``.  This file contains a 64-bit count of the number of
    times each page is mapped, indexed by PFN.
 
+The page-types tool in the tools/vm directory can be used to query the
+number of times a page is mapped.
+
  * ``/proc/kpageflags``.  This file contains a 64-bit set of flags for each
    page, indexed by PFN.
 

Documentation/filesystems/seq_file.txt

@@ -66,23 +66,39 @@ kernel 3.10. Current versions require the following update
 
 The iterator interface
 
-Modules implementing a virtual file with seq_file must implement a simple
-iterator object that allows stepping through the data of interest.
-Iterators must be able to move to a specific position - like the file they
-implement - but the interpretation of that position is up to the iterator
-itself. A seq_file implementation that is formatting firewall rules, for
-example, could interpret position N as the Nth rule in the chain.
-Positioning can thus be done in whatever way makes the most sense for the
-generator of the data, which need not be aware of how a position translates
-to an offset in the virtual file. The one obvious exception is that a
-position of zero should indicate the beginning of the file.
+Modules implementing a virtual file with seq_file must implement an
+iterator object that allows stepping through the data of interest
+during a "session" (roughly one read() system call).  If the iterator
+is able to move to a specific position - like the file they implement,
+though with freedom to map the position number to a sequence location
+in whatever way is convenient - the iterator need only exist
+transiently during a session.  If the iterator cannot easily find a
+numerical position but works well with a first/next interface, the
+iterator can be stored in the private data area and continue from one
+session to the next.
+
+A seq_file implementation that is formatting firewall rules from a
+table, for example, could provide a simple iterator that interprets
+position N as the Nth rule in the chain.  A seq_file implementation
+that presents the content of a, potentially volatile, linked list
+might record a pointer into that list, providing that can be done
+without risk of the current location being removed.
+
+Positioning can thus be done in whatever way makes the most sense for
+the generator of the data, which need not be aware of how a position
+translates to an offset in the virtual file. The one obvious exception
+is that a position of zero should indicate the beginning of the file.
 
 The /proc/sequence iterator just uses the count of the next number it
 will output as its position.
 
-Four functions must be implemented to make the iterator work. The first,
-called start() takes a position as an argument and returns an iterator
-which will start reading at that position. For our simple sequence example,
+Four functions must be implemented to make the iterator work. The
+first, called start(), starts a session and takes a position as an
+argument, returning an iterator which will start reading at that
+position.  The pos passed to start() will always be either zero, or
+the most recent pos used in the previous session.
+
+For our simple sequence example,
 the start() function looks like:
 
 	static void *ct_seq_start(struct seq_file *s, loff_t *pos)
@@ -101,11 +117,12 @@ implementations; in most cases the start() function should check for a
 "past end of file" condition and return NULL if need be.
 
 For more complicated applications, the private field of the seq_file
-structure can be used. There is also a special value which can be returned
-by the start() function called SEQ_START_TOKEN; it can be used if you wish
-to instruct your show() function (described below) to print a header at the
-top of the output. SEQ_START_TOKEN should only be used if the offset is
-zero, however.
+structure can be used to hold state from session to session.  There is
+also a special value which can be returned by the start() function
+called SEQ_START_TOKEN; it can be used if you wish to instruct your
+show() function (described below) to print a header at the top of the
+output. SEQ_START_TOKEN should only be used if the offset is zero,
+however.
 
 The next function to implement is called, amazingly, next(); its job is to
 move the iterator forward to the next position in the sequence.  The
@@ -121,9 +138,13 @@ complete. Here's the example version:
 	        return spos;
 	}
 
-The stop() function is called when iteration is complete; its job, of
-course, is to clean up. If dynamic memory is allocated for the iterator,
-stop() is the place to free it.
+The stop() function closes a session; its job, of course, is to clean
+up. If dynamic memory is allocated for the iterator, stop() is the
+place to free it; if a lock was taken by start(), stop() must release
+that lock.  The value that *pos was set to by the last next() call
+before stop() is remembered, and used for the first start() call of
+the next session unless lseek() has been called on the file; in that
+case next start() will be asked to start at position zero.
 
 	static void ct_seq_stop(struct seq_file *s, void *v)
 	{

MAINTAINERS

@@ -199,12 +199,13 @@ F:	drivers/net/ethernet/8390/
 
 9P FILE SYSTEM
 M:	Eric Van Hensbergen <ericvh@gmail.com>
-M:	Ron Minnich <rminnich@sandia.gov>
 M:	Latchesar Ionkov <lucho@ionkov.net>
+M:	Dominique Martinet <asmadeus@codewreck.org>
 L:	v9fs-developer@lists.sourceforge.net
 W:	http://swik.net/v9fs
 Q:	http://patchwork.kernel.org/project/v9fs-devel/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs.git
+T:	git git://github.com/martinetd/linux.git
 S:	Maintained
 F:	Documentation/filesystems/9p.txt
 F:	fs/9p/

arch/alpha/mm/fault.c

@@ -87,7 +87,8 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
 	struct vm_area_struct * vma;
 	struct mm_struct *mm = current->mm;
 	const struct exception_table_entry *fixup;
-	int fault, si_code = SEGV_MAPERR;
+	int si_code = SEGV_MAPERR;
+	vm_fault_t fault;
 	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 
 	/* As of EV6, a load into $31/$f31 is a prefetch, and never faults

arch/arc/mm/fault.c

@@ -15,6 +15,7 @@
 #include <linux/uaccess.h>
 #include <linux/kdebug.h>
 #include <linux/perf_event.h>
+#include <linux/mm_types.h>
 #include <asm/pgalloc.h>
 #include <asm/mmu.h>
 
@@ -66,7 +67,8 @@ void do_page_fault(unsigned long address, struct pt_regs *regs)
 	struct task_struct *tsk = current;
 	struct mm_struct *mm = tsk->mm;
 	siginfo_t info;
-	int fault, ret;
+	int ret;
+	vm_fault_t fault;
 	int write = regs->ecr_cause & ECR_C_PROTV_STORE;  /* ST/EX */
 	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 

arch/arm/mm/dma-mapping.c

@@ -594,7 +594,7 @@ static void *__alloc_from_contiguous(struct device *dev, size_t size,
 	struct page *page;
 	void *ptr = NULL;
 
-	page = dma_alloc_from_contiguous(dev, count, order, gfp);
+	page = dma_alloc_from_contiguous(dev, count, order, gfp & __GFP_NOWARN);
 	if (!page)
 		return NULL;
 
@@ -1299,7 +1299,8 @@ static struct page **__iommu_alloc_buffer(struct device *dev, size_t size,
 		unsigned long order = get_order(size);
 		struct page *page;
 
-		page = dma_alloc_from_contiguous(dev, count, order, gfp);
+		page = dma_alloc_from_contiguous(dev, count, order,
+						 gfp & __GFP_NOWARN);
 		if (!page)
 			goto error;
 

arch/arm/mm/fault.c

@@ -224,12 +224,12 @@ static inline bool access_error(unsigned int fsr, struct vm_area_struct *vma)
 	return vma->vm_flags & mask ? false : true;
 }
 
-static int __kprobes
+static vm_fault_t __kprobes
 __do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
 		unsigned int flags, struct task_struct *tsk)
 {
 	struct vm_area_struct *vma;
-	int fault;
+	vm_fault_t fault;
 
 	vma = find_vma(mm, addr);
 	fault = VM_FAULT_BADMAP;
@@ -264,7 +264,8 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 {
 	struct task_struct *tsk;
 	struct mm_struct *mm;
-	int fault, sig, code;
+	int sig, code;
+	vm_fault_t fault;
 	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 
 	if (notify_page_fault(regs, fsr))

arch/arm64/mm/dma-mapping.c

@@ -355,7 +355,7 @@ static int __init atomic_pool_init(void)
 
 	if (dev_get_cma_area(NULL))
 		page = dma_alloc_from_contiguous(NULL, nr_pages,
-						 pool_size_order, GFP_KERNEL);
+						 pool_size_order, false);
 	else
 		page = alloc_pages(GFP_DMA32, pool_size_order);
 
@@ -573,7 +573,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size,
 		struct page *page;
 
 		page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
-						 get_order(size), gfp);
+					get_order(size), gfp & __GFP_NOWARN);
 		if (!page)
 			return NULL;
 

arch/arm64/mm/fault.c

@@ -379,12 +379,12 @@ static void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *re
 #define VM_FAULT_BADMAP		0x010000
 #define VM_FAULT_BADACCESS	0x020000
 
-static int __do_page_fault(struct mm_struct *mm, unsigned long addr,
+static vm_fault_t __do_page_fault(struct mm_struct *mm, unsigned long addr,
 			   unsigned int mm_flags, unsigned long vm_flags,
 			   struct task_struct *tsk)
 {
 	struct vm_area_struct *vma;
-	int fault;
+	vm_fault_t fault;
 
 	vma = find_vma(mm, addr);
 	fault = VM_FAULT_BADMAP;
@@ -427,7 +427,7 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
 	struct task_struct *tsk;
 	struct mm_struct *mm;
 	struct siginfo si;
-	int fault, major = 0;
+	vm_fault_t fault, major = 0;
 	unsigned long vm_flags = VM_READ | VM_WRITE;
 	unsigned int mm_flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 

arch/hexagon/mm/vm_fault.c

@@ -52,7 +52,7 @@ void do_page_fault(unsigned long address, long cause, struct pt_regs *regs)
 	struct mm_struct *mm = current->mm;
 	int si_signo;
 	int si_code = SEGV_MAPERR;
-	int fault;
+	vm_fault_t fault;
 	const struct exception_table_entry *fixup;
 	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 

arch/ia64/mm/fault.c

@@ -86,7 +86,7 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
 	struct vm_area_struct *vma, *prev_vma;
 	struct mm_struct *mm = current->mm;
 	unsigned long mask;
-	int fault;
+	vm_fault_t fault;
 	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 
 	mask = ((((isr >> IA64_ISR_X_BIT) & 1UL) << VM_EXEC_BIT)

arch/m68k/mm/fault.c

@@ -70,7 +70,7 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
 {
 	struct mm_struct *mm = current->mm;
 	struct vm_area_struct * vma;
-	int fault;
+	vm_fault_t fault;
 	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 
 	pr_debug("do page fault:\nregs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld, %p\n",
@@ -136,7 +136,7 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
 	 */
 
 	fault = handle_mm_fault(vma, address, flags);
-	pr_debug("handle_mm_fault returns %d\n", fault);
+	pr_debug("handle_mm_fault returns %x\n", fault);
 
 	if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
 		return 0;

arch/microblaze/mm/fault.c

@@ -90,7 +90,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	struct mm_struct *mm = current->mm;
 	int code = SEGV_MAPERR;
 	int is_write = error_code & ESR_S;
-	int fault;
+	vm_fault_t fault;
 	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 
 	regs->ear = address;

arch/mips/mm/fault.c

@@ -43,7 +43,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
 	struct mm_struct *mm = tsk->mm;
 	const int field = sizeof(unsigned long) * 2;
 	int si_code;
-	int fault;
+	vm_fault_t fault;
 	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 
 	static DEFINE_RATELIMIT_STATE(ratelimit_state, 5 * HZ, 10);

arch/nds32/mm/fault.c

@@ -73,7 +73,7 @@ void do_page_fault(unsigned long entry, unsigned long addr,
 	struct mm_struct *mm;
 	struct vm_area_struct *vma;
 	int si_code;
-	int fault;
+	vm_fault_t fault;
 	unsigned int mask = VM_READ | VM_WRITE | VM_EXEC;
 	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 

arch/nios2/mm/fault.c

@@ -47,7 +47,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long cause,
 	struct task_struct *tsk = current;
 	struct mm_struct *mm = tsk->mm;
 	int code = SEGV_MAPERR;
-	int fault;
+	vm_fault_t fault;
 	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 
 	cause >>= 2;

arch/openrisc/mm/fault.c

@@ -53,7 +53,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
 	struct mm_struct *mm;
 	struct vm_area_struct *vma;
 	int si_code;
-	int fault;
+	vm_fault_t fault;
 	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 
 	tsk = current;

arch/parisc/mm/fault.c

@@ -262,7 +262,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
 	struct task_struct *tsk;
 	struct mm_struct *mm;
 	unsigned long acc_type;
-	int fault = 0;
+	vm_fault_t fault = 0;
 	unsigned int flags;
 
 	if (faulthandler_disabled())