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Merge branch 'akpm' (incoming from Andrew) 

Merge misc fixes from Andrew Morton:
 "13 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  agp: info leak in agpioc_info_wrap()
  fs/affs/super.c: bugfix / double free
  fanotify: fix -EOVERFLOW with large files on 64-bit
  slub: use sysfs'es release mechanism for kmem_cache
  revert "mm: vmscan: do not swap anon pages just because free+file is low"
  autofs: fix lockref lookup
  mm: filemap: update find_get_pages_tag() to deal with shadow entries
  mm/compaction: make isolate_freepages start at pageblock boundary
  MAINTAINERS: zswap/zbud: change maintainer email address
  mm/page-writeback.c: fix divide by zero in pos_ratio_polynom
  hugetlb: ensure hugepage access is denied if hugepages are not supported
  slub: fix memcg_propagate_slab_attrs
  drivers/rtc/rtc-pcf8523.c: fix month definition
This commit is contained in:
Linus Torvalds 2014-05-06 13:07:41 -07:00
parent 8169d3005e 3ca9e5d36a
commit 38583f095c
19 changed files with 147 additions and 91 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
MAINTAINERS
View File

@ -9960,7 +9960,7 @@ F: drivers/net/hamradio/*scc.c
F: drivers/net/hamradio/z8530.h
ZBUD COMPRESSED PAGE ALLOCATOR
M: Seth Jennings <sjenning@linux.vnet.ibm.com>
M: Seth Jennings <sjennings@variantweb.net>
L: linux-mm@kvack.org
S: Maintained
F: mm/zbud.c
@ -10005,7 +10005,7 @@ F: mm/zsmalloc.c
F: include/linux/zsmalloc.h
ZSWAP COMPRESSED SWAP CACHING
M: Seth Jennings <sjenning@linux.vnet.ibm.com>
M: Seth Jennings <sjennings@variantweb.net>
L: linux-mm@kvack.org
S: Maintained
F: mm/zswap.c

1
drivers/char/agp/frontend.c
View File

@ -730,6 +730,7 @@ static int agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
agp_copy_info(agp_bridge, &kerninfo);
memset(&userinfo, 0, sizeof(userinfo));
userinfo.version.major = kerninfo.version.major;
userinfo.version.minor = kerninfo.version.minor;
userinfo.bridge_id = kerninfo.device->vendor |

4
drivers/rtc/rtc-pcf8523.c
View File

@ -206,7 +206,7 @@ static int pcf8523_rtc_read_time(struct device *dev, struct rtc_time *tm)
tm->tm_hour = bcd2bin(regs[2] & 0x3f);
tm->tm_mday = bcd2bin(regs[3] & 0x3f);
tm->tm_wday = regs[4] & 0x7;
tm->tm_mon = bcd2bin(regs[5] & 0x1f);
tm->tm_mon = bcd2bin(regs[5] & 0x1f) - 1;
tm->tm_year = bcd2bin(regs[6]) + 100;
return rtc_valid_tm(tm);
@ -229,7 +229,7 @@ static int pcf8523_rtc_set_time(struct device *dev, struct rtc_time *tm)
regs[3] = bin2bcd(tm->tm_hour);
regs[4] = bin2bcd(tm->tm_mday);
regs[5] = tm->tm_wday;
regs[6] = bin2bcd(tm->tm_mon);
regs[6] = bin2bcd(tm->tm_mon + 1);
regs[7] = bin2bcd(tm->tm_year - 100);
msg.addr = client->addr;

2
fs/affs/super.c
View File

@ -340,8 +340,6 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
&blocksize,&sbi->s_prefix,
sbi->s_volume, &mount_flags)) {
printk(KERN_ERR "AFFS: Error parsing options\n");
kfree(sbi->s_prefix);
kfree(sbi);
return -EINVAL;
}
/* N.B. after this point s_prefix must be released */

4
fs/autofs4/root.c
View File

@ -179,7 +179,7 @@ static struct dentry *autofs4_lookup_active(struct dentry *dentry)
spin_lock(&active->d_lock);
/* Already gone? */
if (!d_count(active))
if ((int) d_count(active) <= 0)
goto next;
qstr = &active->d_name;
@ -230,7 +230,7 @@ static struct dentry *autofs4_lookup_expiring(struct dentry *dentry)
spin_lock(&expiring->d_lock);
/* Bad luck, we've already been dentry_iput */
/* We've already been dentry_iput or unlinked */
if (!expiring->d_inode)
goto next;

5
fs/hugetlbfs/inode.c
View File

@ -1030,6 +1030,11 @@ static int __init init_hugetlbfs_fs(void)
int error;
int i;
if (!hugepages_supported()) {
pr_info("hugetlbfs: disabling because there are no supported hugepage sizes\n");
return -ENOTSUPP;
}
error = bdi_init(&hugetlbfs_backing_dev_info);
if (error)
return error;

2
fs/notify/fanotify/fanotify_user.c
View File

@ -698,6 +698,8 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
}
group->overflow_event = &oevent->fse;
if (force_o_largefile())
event_f_flags |= O_LARGEFILE;
group->fanotify_data.f_flags = event_f_flags;
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
spin_lock_init(&group->fanotify_data.access_lock);

10
include/linux/hugetlb.h
View File

@ -412,6 +412,16 @@ static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
return &mm->page_table_lock;
}
static inline bool hugepages_supported(void)
{
/*
* Some platform decide whether they support huge pages at boot
* time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
* there is no such support
*/
return HPAGE_SHIFT != 0;
}
#else /* CONFIG_HUGETLB_PAGE */
struct hstate {};
#define alloc_huge_page_node(h, nid) NULL

9
include/linux/slub_def.h
View File

@ -101,4 +101,13 @@ struct kmem_cache {
struct kmem_cache_node *node[MAX_NUMNODES];
};
#ifdef CONFIG_SYSFS
#define SLAB_SUPPORTS_SYSFS
void sysfs_slab_remove(struct kmem_cache *);
#else
static inline void sysfs_slab_remove(struct kmem_cache *s)
{
}
#endif
#endif /* _LINUX_SLUB_DEF_H */

22
mm/compaction.c
View File

@ -671,16 +671,20 @@ static void isolate_freepages(struct zone *zone,
struct compact_control *cc)
{
struct page *page;
unsigned long high_pfn, low_pfn, pfn, z_end_pfn, end_pfn;
unsigned long high_pfn, low_pfn, pfn, z_end_pfn;
int nr_freepages = cc->nr_freepages;
struct list_head *freelist = &cc->freepages;
/*
* Initialise the free scanner. The starting point is where we last
* scanned from (or the end of the zone if starting). The low point
* is the end of the pageblock the migration scanner is using.
* successfully isolated from, zone-cached value, or the end of the
* zone when isolating for the first time. We need this aligned to
* the pageblock boundary, because we do pfn -= pageblock_nr_pages
* in the for loop.
* The low boundary is the end of the pageblock the migration scanner
* is using.
*/
pfn = cc->free_pfn;
pfn = cc->free_pfn & ~(pageblock_nr_pages-1);
low_pfn = ALIGN(cc->migrate_pfn + 1, pageblock_nr_pages);
/*
@ -700,6 +704,7 @@ static void isolate_freepages(struct zone *zone,
for (; pfn >= low_pfn && cc->nr_migratepages > nr_freepages;
pfn -= pageblock_nr_pages) {
unsigned long isolated;
unsigned long end_pfn;
/*
* This can iterate a massively long zone without finding any
@ -734,13 +739,10 @@ static void isolate_freepages(struct zone *zone,
isolated = 0;
/*
* As pfn may not start aligned, pfn+pageblock_nr_page
* may cross a MAX_ORDER_NR_PAGES boundary and miss
* a pfn_valid check. Ensure isolate_freepages_block()
* only scans within a pageblock
* Take care when isolating in last pageblock of a zone which
* ends in the middle of a pageblock.
*/
end_pfn = ALIGN(pfn + 1, pageblock_nr_pages);
end_pfn = min(end_pfn, z_end_pfn);
end_pfn = min(pfn + pageblock_nr_pages, z_end_pfn);
isolated = isolate_freepages_block(cc, pfn, end_pfn,
freelist, false);
nr_freepages += isolated;

49
mm/filemap.c
View File

@ -906,8 +906,8 @@ EXPORT_SYMBOL(page_cache_prev_hole);
* Looks up the page cache slot at @mapping & @offset. If there is a
* page cache page, it is returned with an increased refcount.
*
* If the slot holds a shadow entry of a previously evicted page, it
* is returned.
* If the slot holds a shadow entry of a previously evicted page, or a
* swap entry from shmem/tmpfs, it is returned.
*
* Otherwise, %NULL is returned.
*/
@ -928,9 +928,9 @@ struct page *find_get_entry(struct address_space *mapping, pgoff_t offset)
if (radix_tree_deref_retry(page))
goto repeat;
/*
* Otherwise, shmem/tmpfs must be storing a swap entry
* here as an exceptional entry: so return it without
* attempting to raise page count.
* A shadow entry of a recently evicted page,
* or a swap entry from shmem/tmpfs. Return
* it without attempting to raise page count.
*/
goto out;
}
@ -983,8 +983,8 @@ EXPORT_SYMBOL(find_get_page);
* page cache page, it is returned locked and with an increased
* refcount.
*
* If the slot holds a shadow entry of a previously evicted page, it
* is returned.
* If the slot holds a shadow entry of a previously evicted page, or a
* swap entry from shmem/tmpfs, it is returned.
*
* Otherwise, %NULL is returned.
*
@ -1099,8 +1099,8 @@ EXPORT_SYMBOL(find_or_create_page);
* with ascending indexes. There may be holes in the indices due to
* not-present pages.
*
* Any shadow entries of evicted pages are included in the returned
* array.
* Any shadow entries of evicted pages, or swap entries from
* shmem/tmpfs, are included in the returned array.
*
* find_get_entries() returns the number of pages and shadow entries
* which were found.
@ -1128,9 +1128,9 @@ unsigned find_get_entries(struct address_space *mapping,
if (radix_tree_deref_retry(page))
goto restart;
/*
* Otherwise, we must be storing a swap entry
* here as an exceptional entry: so return it
* without attempting to raise page count.
* A shadow entry of a recently evicted page,
* or a swap entry from shmem/tmpfs. Return
* it without attempting to raise page count.
*/
goto export;
}
@ -1198,9 +1198,9 @@ unsigned find_get_pages(struct address_space *mapping, pgoff_t start,
goto restart;
}
/*
* Otherwise, shmem/tmpfs must be storing a swap entry
* here as an exceptional entry: so skip over it -
* we only reach this from invalidate_mapping_pages().
* A shadow entry of a recently evicted page,
* or a swap entry from shmem/tmpfs. Skip
* over it.
*/
continue;
}
@ -1265,9 +1265,9 @@ unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t index,
goto restart;
}
/*
* Otherwise, shmem/tmpfs must be storing a swap entry
* here as an exceptional entry: so stop looking for
* contiguous pages.
* A shadow entry of a recently evicted page,
* or a swap entry from shmem/tmpfs. Stop
* looking for contiguous pages.
*/
break;
}
@ -1341,10 +1341,17 @@ unsigned find_get_pages_tag(struct address_space *mapping, pgoff_t *index,
goto restart;
}
/*
* This function is never used on a shmem/tmpfs
* mapping, so a swap entry won't be found here.
* A shadow entry of a recently evicted page.
*
* Those entries should never be tagged, but
* this tree walk is lockless and the tags are
* looked up in bulk, one radix tree node at a
* time, so there is a sizable window for page
* reclaim to evict a page we saw tagged.
*
* Skip over it.
*/
BUG();
continue;
}
if (!page_cache_get_speculative(page))

19
mm/hugetlb.c
View File

@ -1981,11 +1981,7 @@ static int __init hugetlb_init(void)
{
int i;
/* Some platform decide whether they support huge pages at boot
* time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
* there is no such support
*/
if (HPAGE_SHIFT == 0)
if (!hugepages_supported())
return 0;
if (!size_to_hstate(default_hstate_size)) {
@ -2112,6 +2108,9 @@ static int hugetlb_sysctl_handler_common(bool obey_mempolicy,
unsigned long tmp;
int ret;
if (!hugepages_supported())
return -ENOTSUPP;
tmp = h->max_huge_pages;
if (write && h->order >= MAX_ORDER)
@ -2165,6 +2164,9 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write,
unsigned long tmp;
int ret;
if (!hugepages_supported())
return -ENOTSUPP;
tmp = h->nr_overcommit_huge_pages;
if (write && h->order >= MAX_ORDER)
@ -2190,6 +2192,8 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write,
void hugetlb_report_meminfo(struct seq_file *m)
{
struct hstate *h = &default_hstate;
if (!hugepages_supported())
return;
seq_printf(m,
"HugePages_Total: %5lu\n"
"HugePages_Free: %5lu\n"
@ -2206,6 +2210,8 @@ void hugetlb_report_meminfo(struct seq_file *m)
int hugetlb_report_node_meminfo(int nid, char *buf)
{
struct hstate *h = &default_hstate;
if (!hugepages_supported())
return 0;
return sprintf(buf,
"Node %d HugePages_Total: %5u\n"
"Node %d HugePages_Free: %5u\n"
@ -2220,6 +2226,9 @@ void hugetlb_show_meminfo(void)
struct hstate *h;
int nid;
if (!hugepages_supported())
return;
for_each_node_state(nid, N_MEMORY)
for_each_hstate(h)
pr_info("Node %d hugepages_total=%u hugepages_free=%u hugepages_surp=%u hugepages_size=%lukB\n",

20
mm/memcontrol.c
View File

@ -6686,16 +6686,20 @@ static struct page *mc_handle_file_pte(struct vm_area_struct *vma,
pgoff = pte_to_pgoff(ptent);
/* page is moved even if it's not RSS of this task(page-faulted). */
page = find_get_page(mapping, pgoff);
#ifdef CONFIG_SWAP
/* shmem/tmpfs may report page out on swap: account for that too. */
if (radix_tree_exceptional_entry(page)) {
swp_entry_t swap = radix_to_swp_entry(page);
if (do_swap_account)
*entry = swap;
page = find_get_page(swap_address_space(swap), swap.val);
}
if (shmem_mapping(mapping)) {
page = find_get_entry(mapping, pgoff);
if (radix_tree_exceptional_entry(page)) {
swp_entry_t swp = radix_to_swp_entry(page);
if (do_swap_account)
*entry = swp;
page = find_get_page(swap_address_space(swp), swp.val);
}
} else
page = find_get_page(mapping, pgoff);
#else
page = find_get_page(mapping, pgoff);
#endif
return page;
}

6
mm/page-writeback.c
View File

@ -593,14 +593,14 @@ unsigned long bdi_dirty_limit(struct backing_dev_info *bdi, unsigned long dirty)
* (5) the closer to setpoint, the smaller |df/dx| (and the reverse)
* => fast response on large errors; small oscillation near setpoint
*/
static inline long long pos_ratio_polynom(unsigned long setpoint,
static long long pos_ratio_polynom(unsigned long setpoint,
unsigned long dirty,
unsigned long limit)
{
long long pos_ratio;
long x;
x = div_s64(((s64)setpoint - (s64)dirty) << RATELIMIT_CALC_SHIFT,
x = div64_s64(((s64)setpoint - (s64)dirty) << RATELIMIT_CALC_SHIFT,
limit - setpoint + 1);
pos_ratio = x;
pos_ratio = pos_ratio * x >> RATELIMIT_CALC_SHIFT;
@ -842,7 +842,7 @@ static unsigned long bdi_position_ratio(struct backing_dev_info *bdi,
x_intercept = bdi_setpoint + span;
if (bdi_dirty < x_intercept - span / 4) {
pos_ratio = div_u64(pos_ratio * (x_intercept - bdi_dirty),
pos_ratio = div64_u64(pos_ratio * (x_intercept - bdi_dirty),
x_intercept - bdi_setpoint + 1);
} else
pos_ratio /= 4;

1
mm/slab.h
View File

@ -91,6 +91,7 @@ __kmem_cache_alias(const char *name, size_t size, size_t align,
#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
int __kmem_cache_shutdown(struct kmem_cache *);
void slab_kmem_cache_release(struct kmem_cache *);
struct seq_file;
struct file;

13
mm/slab_common.c
View File

@ -323,6 +323,12 @@ static int kmem_cache_destroy_memcg_children(struct kmem_cache *s)
}
#endif /* CONFIG_MEMCG_KMEM */
void slab_kmem_cache_release(struct kmem_cache *s)
{
kfree(s->name);
kmem_cache_free(kmem_cache, s);
}
void kmem_cache_destroy(struct kmem_cache *s)
{
get_online_cpus();
@ -352,8 +358,11 @@ void kmem_cache_destroy(struct kmem_cache *s)
rcu_barrier();
memcg_free_cache_params(s);
kfree(s->name);
kmem_cache_free(kmem_cache, s);
#ifdef SLAB_SUPPORTS_SYSFS
sysfs_slab_remove(s);
#else
slab_kmem_cache_release(s);
#endif
goto out_put_cpus;
out_unlock:

41
mm/slub.c
View File

@ -210,14 +210,11 @@ enum track_item { TRACK_ALLOC, TRACK_FREE };
#ifdef CONFIG_SYSFS
static int sysfs_slab_add(struct kmem_cache *);
static int sysfs_slab_alias(struct kmem_cache *, const char *);
static void sysfs_slab_remove(struct kmem_cache *);
static void memcg_propagate_slab_attrs(struct kmem_cache *s);
#else
static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; }
static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p)
{ return 0; }
static inline void sysfs_slab_remove(struct kmem_cache *s) { }
static inline void memcg_propagate_slab_attrs(struct kmem_cache *s) { }
#endif
@ -3238,24 +3235,7 @@ static inline int kmem_cache_close(struct kmem_cache *s)
int __kmem_cache_shutdown(struct kmem_cache *s)
{
int rc = kmem_cache_close(s);
if (!rc) {
/*
* Since slab_attr_store may take the slab_mutex, we should
* release the lock while removing the sysfs entry in order to
* avoid a deadlock. Because this is pretty much the last
* operation we do and the lock will be released shortly after
* that in slab_common.c, we could just move sysfs_slab_remove
* to a later point in common code. We should do that when we
* have a common sysfs framework for all allocators.
*/
mutex_unlock(&slab_mutex);
sysfs_slab_remove(s);
mutex_lock(&slab_mutex);
}
return rc;
return kmem_cache_close(s);
}
/********************************************************************
@ -5071,15 +5051,18 @@ static void memcg_propagate_slab_attrs(struct kmem_cache *s)
#ifdef CONFIG_MEMCG_KMEM
int i;
char *buffer = NULL;
struct kmem_cache *root_cache;
if (!is_root_cache(s))
if (is_root_cache(s))
return;
root_cache = s->memcg_params->root_cache;
/*
* This mean this cache had no attribute written. Therefore, no point
* in copying default values around
*/
if (!s->max_attr_size)
if (!root_cache->max_attr_size)
return;
for (i = 0; i < ARRAY_SIZE(slab_attrs); i++) {
@ -5101,7 +5084,7 @@ static void memcg_propagate_slab_attrs(struct kmem_cache *s)
*/
if (buffer)
buf = buffer;
else if (s->max_attr_size < ARRAY_SIZE(mbuf))
else if (root_cache->max_attr_size < ARRAY_SIZE(mbuf))
buf = mbuf;
else {
buffer = (char *) get_zeroed_page(GFP_KERNEL);
@ -5110,7 +5093,7 @@ static void memcg_propagate_slab_attrs(struct kmem_cache *s)
buf = buffer;
}
attr->show(s->memcg_params->root_cache, buf);
attr->show(root_cache, buf);
attr->store(s, buf, strlen(buf));
}
@ -5119,6 +5102,11 @@ static void memcg_propagate_slab_attrs(struct kmem_cache *s)
#endif
}
static void kmem_cache_release(struct kobject *k)
{
slab_kmem_cache_release(to_slab(k));
}
static const struct sysfs_ops slab_sysfs_ops = {
.show = slab_attr_show,
.store = slab_attr_store,
@ -5126,6 +5114,7 @@ static const struct sysfs_ops slab_sysfs_ops = {
static struct kobj_type slab_ktype = {
.sysfs_ops = &slab_sysfs_ops,
.release = kmem_cache_release,
};
static int uevent_filter(struct kset *kset, struct kobject *kobj)
@ -5252,7 +5241,7 @@ static int sysfs_slab_add(struct kmem_cache *s)
goto out;
}
static void sysfs_slab_remove(struct kmem_cache *s)
void sysfs_slab_remove(struct kmem_cache *s)
{
if (slab_state < FULL)
/*

8
mm/truncate.c
View File

@ -484,14 +484,6 @@ unsigned long invalidate_mapping_pages(struct address_space *mapping,
unsigned long count = 0;
int i;
/*
* Note: this function may get called on a shmem/tmpfs mapping:
* pagevec_lookup() might then return 0 prematurely (because it
* got a gangful of swap entries); but it's hardly worth worrying
* about - it can rarely have anything to free from such a mapping
* (most pages are dirty), and already skips over any difficulties.
*/
pagevec_init(&pvec, 0);
while (index <= end && pagevec_lookup_entries(&pvec, mapping, index,
min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1,

18
mm/vmscan.c
View File

@ -1915,6 +1915,24 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
file = get_lru_size(lruvec, LRU_ACTIVE_FILE) +
get_lru_size(lruvec, LRU_INACTIVE_FILE);
/*
* Prevent the reclaimer from falling into the cache trap: as
* cache pages start out inactive, every cache fault will tip
* the scan balance towards the file LRU. And as the file LRU
* shrinks, so does the window for rotation from references.
* This means we have a runaway feedback loop where a tiny
* thrashing file LRU becomes infinitely more attractive than
* anon pages. Try to detect this based on file LRU size.
*/
if (global_reclaim(sc)) {
unsigned long free = zone_page_state(zone, NR_FREE_PAGES);
if (unlikely(file + free <= high_wmark_pages(zone))) {
scan_balance = SCAN_ANON;
goto out;
}
}
/*
* There is enough inactive page cache, do not reclaim
* anything from the anonymous working set right now.