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author | David S. Miller <davem@davemloft.net> | 2015-05-23 01:22:35 -0400 |
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committer | David S. Miller <davem@davemloft.net> | 2015-05-23 01:22:35 -0400 |
commit | 36583eb54d46c36a447afd6c379839f292397429 (patch) | |
tree | 70f5399529dc2135a986947b37c655194da60e9d /arch/powerpc/mm/pgtable_64.c | |
parent | Merge branch 'pktgen-new-scripts' (diff) | |
parent | Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux (diff) | |
download | linux-dev-36583eb54d46c36a447afd6c379839f292397429.tar.xz linux-dev-36583eb54d46c36a447afd6c379839f292397429.zip |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflicts:
drivers/net/ethernet/cadence/macb.c
drivers/net/phy/phy.c
include/linux/skbuff.h
net/ipv4/tcp.c
net/switchdev/switchdev.c
Switchdev was a case of RTNH_H_{EXTERNAL --> OFFLOAD}
renaming overlapping with net-next changes of various
sorts.
phy.c was a case of two changes, one adding a local
variable to a function whilst the second was removing
one.
tcp.c overlapped a deadlock fix with the addition of new tcp_info
statistic values.
macb.c involved the addition of two zyncq device entries.
skbuff.h involved adding back ipv4_daddr to nf_bridge_info
whilst net-next changes put two other existing members of
that struct into a union.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/powerpc/mm/pgtable_64.c')
-rw-r--r-- | arch/powerpc/mm/pgtable_64.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index 59daa5eeec25..6bfadf1aa5cb 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -839,6 +839,17 @@ pmd_t pmdp_get_and_clear(struct mm_struct *mm, * hash fault look at them. */ memset(pgtable, 0, PTE_FRAG_SIZE); + /* + * Serialize against find_linux_pte_or_hugepte which does lock-less + * lookup in page tables with local interrupts disabled. For huge pages + * it casts pmd_t to pte_t. Since format of pte_t is different from + * pmd_t we want to prevent transit from pmd pointing to page table + * to pmd pointing to huge page (and back) while interrupts are disabled. + * We clear pmd to possibly replace it with page table pointer in + * different code paths. So make sure we wait for the parallel + * find_linux_pte_or_hugepage to finish. + */ + kick_all_cpus_sync(); return old_pmd; } |