On Tue, 3 Jan 2017 17:13:49 -0700 Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> wrote: > On Thu, Dec 22, 2016 at 02:18:52PM -0700, Ross Zwisler wrote: > > Currently dax_mapping_entry_mkclean() fails to clean and write protect the > > pmd_t of a DAX PMD entry during an *sync operation. This can result in > > data loss, as detailed in patch 4. > > > > You can find a working tree here: > > > > https://git.kernel.org/cgit/linux/kernel/git/zwisler/linux.git/log/?h=dax_pmd_clean_v2 > > > > This series applies cleanly to mmotm-2016-12-19-16-31. > > > > Changes since v1: > > - Included Dan's patch to kill DAX support for UML. > > - Instead of wrapping the DAX PMD code in dax_mapping_entry_mkclean() in > > an #ifdef, we now create a stub for pmdp_huge_clear_flush() for the case > > when CONFIG_TRANSPARENT_HUGEPAGE isn't defined. (Dan & Jan) > > > > Dan Williams (1): > > dax: kill uml support > > > > Ross Zwisler (3): > > dax: add stub for pmdp_huge_clear_flush() > > mm: add follow_pte_pmd() > > dax: wrprotect pmd_t in dax_mapping_entry_mkclean > > > > fs/Kconfig | 2 +- > > fs/dax.c | 49 ++++++++++++++++++++++++++++++------------- > > include/asm-generic/pgtable.h | 10 +++++++++ > > include/linux/mm.h | 4 ++-- > > mm/memory.c | 41 ++++++++++++++++++++++++++++-------- > > 5 files changed, 79 insertions(+), 27 deletions(-) > > Well, 0-day found another architecture that doesn't define pmd_pfn() et al., > so we'll need some more fixes. (Thank you, 0-day, for the coverage!) > > I have to apologize, I didn't understand that Dan intended his "dax: kill uml > support" patch to land in v4.11. I thought he intended it as a cleanup to my > series, which really needs to land in v4.10. That's why I folded them > together into this v2, along with the wrapper suggested by Jan. > > Andrew, does it work for you to just keep v1 of this series, and eventually > send that to Linus for v4.10? > > https://lkml.org/lkml/2016/12/20/649 > > You've already pulled that one into -mm, and it does correctly solve the data > loss issue. > > That would let us deal with getting rid of the #ifdef, blacklisting > architectures and introducing the pmdp_huge_clear_flush() strub in a follow-on > series for v4.11. I have mm-add-follow_pte_pmd.patch and dax-wrprotect-pmd_t-in-dax_mapping_entry_mkclean.patch queued for 4.10. Please (re)send any additional patches, indicating for each one whether you believe it should also go into 4.10? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>