On Wed, Mar 13, 2019 at 2:58 AM Jan Kara <jack(a)suse.cz> wrote:
On Wed 13-03-19 10:17:17, Aneesh Kumar K.V wrote:
> Hi Dan/Andrew/Jan,
> "Aneesh Kumar K.V" <aneesh.kumar(a)linux.ibm.com> writes:
> > Architectures like ppc64 use the deposited page table to store hardware
> > page table slot information. Make sure we deposit a page table when
> > using zero page at the pmd level for hash.
> > Without this we hit
> > Unable to handle kernel paging request for data at address 0x00000000
> > Faulting instruction address: 0xc000000000082a74
> > Oops: Kernel access of bad area, sig: 11 [#1]
> > ....
> > NIP [c000000000082a74] __hash_page_thp+0x224/0x5b0
> > LR [c0000000000829a4] __hash_page_thp+0x154/0x5b0
> > Call Trace:
> > hash_page_mm+0x43c/0x740
> > do_hash_page+0x2c/0x3c
> > copy_from_iter_flushcache+0xa4/0x4a0
> > pmem_copy_from_iter+0x2c/0x50 [nd_pmem]
> > dax_copy_from_iter+0x40/0x70
> > dax_iomap_actor+0x134/0x360
> > iomap_apply+0xfc/0x1b0
> > dax_iomap_rw+0xac/0x130
> > ext4_file_write_iter+0x254/0x460 [ext4]
> > __vfs_write+0x120/0x1e0
> > vfs_write+0xd8/0x220
> > SyS_write+0x6c/0x110
> > system_call+0x3c/0x130
> > Fixes: b5beae5e224f ("powerpc/pseries: Add driver for PAPR SCM
> > Reviewed-by: Jan Kara <jack(a)suse.cz>
> > Signed-off-by: Aneesh Kumar K.V <aneesh.kumar(a)linux.ibm.com>
> Any suggestion on which tree this patch should got to? Also since this
> fix a kernel crash, we may want to get this to 5.1?
I think this should go through Dan's tree...
I'll merge this and let it soak in -next for a week and then submit for 5.1-rc2.