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Merge branch 'hughd-fixes' (patches from Hugh Dickins)

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Merge VM fixes from High Dickins:
 "I get the impression that Andrew is away or busy at the moment, so I'm
  going to send you three independent uncontroversial little mm fixes
  directly - though none is strictly a 4.8 regression fix.

   - shmem: fix tmpfs to handle the huge= option properly from Toshi
     Kani is a one-liner to fix a major embarrassment in 4.8's hugepages
     on tmpfs feature: although Hillf pointed it out in June, somehow
     both Kirill and I repeatedly dropped the ball on this one.  You
     might wonder if the feature got tested at all with that bug in:
     yes, it did, but for wider testing coverage, Kirill and I had each
     relied too much on an override which bypasses that condition.

   - huge tmpfs: fix Committed_AS leak just a run-of-the-mill accounting
     fix in the same feature.

   - mm: delete unnecessary and unsafe init_tlb_ubc() is an unrelated
     fix to 4.3's TLB flush batching in reclaim: the bug would be rare,
     and none of us will be shamed if this one misses 4.8; but it got
     such a quick ack from Mel today that I'm inclined to offer it along
     with the first two"

* emailed patches from Hugh Dickins <hughd@google.com>:
  mm: delete unnecessary and unsafe init_tlb_ubc()
  huge tmpfs: fix Committed_AS leak
  shmem: fix tmpfs to handle the huge= option properly
This commit is contained in:
Linus Torvalds 2016-09-24 11:31:45 -07:00
commit 0f26574178
2 changed files with 3 additions and 21 deletions
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5
mm/shmem.c
View file

@ -270,7 +270,7 @@ bool shmem_charge(struct inode *inode, long pages)
info->alloced -= pages;
shmem_recalc_inode(inode);
spin_unlock_irqrestore(&info->lock, flags);
shmem_unacct_blocks(info->flags, pages);
return false;
}
percpu_counter_add(&sbinfo->used_blocks, pages);
@ -291,6 +291,7 @@ void shmem_uncharge(struct inode *inode, long pages)
if (sbinfo->max_blocks)
percpu_counter_sub(&sbinfo->used_blocks, pages);
shmem_unacct_blocks(info->flags, pages);
}
/*
@ -1980,7 +1981,7 @@ unsigned long shmem_get_unmapped_area(struct file *file,
return addr;
sb = shm_mnt->mnt_sb;
}
if (SHMEM_SB(sb)->huge != SHMEM_HUGE_NEVER)
if (SHMEM_SB(sb)->huge == SHMEM_HUGE_NEVER)
return addr;
}

19
mm/vmscan.c
View file

@ -2303,23 +2303,6 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
}
}
#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
static void init_tlb_ubc(void)
{
/*
* This deliberately does not clear the cpumask as it's expensive
* and unnecessary. If there happens to be data in there then the
* first SWAP_CLUSTER_MAX pages will send an unnecessary IPI and
* then will be cleared.
*/
current->tlb_ubc.flush_required = false;
}
#else
static inline void init_tlb_ubc(void)
{
}
#endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
/*
* This is a basic per-node page freer. Used by both kswapd and direct reclaim.
*/
@ -2355,8 +2338,6 @@ static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memc
scan_adjusted = (global_reclaim(sc) && !current_is_kswapd() &&
sc->priority == DEF_PRIORITY);
init_tlb_ubc();
blk_start_plug(&plug);
while (nr[LRU_INACTIVE_ANON] || nr[LRU_ACTIVE_FILE] ||
nr[LRU_INACTIVE_FILE]) {