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| author | Dan Williams <dan.j.williams@intel.com> | 2017-10-23 16:20:00 +0200 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2018-01-20 01:50:53 +0100 |
| commit | 785a3fab4adbf91b2189c928a59ae219c54ba95e (patch) | |
| tree | 7a3f3342c336eb99cbc7ddbe09741af78d7e99b2 /arch/powerpc | |
| parent | mm: Fix devm_memremap_pages() collision handling (diff) | |
| download | linux-785a3fab4adbf91b2189c928a59ae219c54ba95e.tar.xz linux-785a3fab4adbf91b2189c928a59ae219c54ba95e.zip | |
mm, dax: introduce pfn_t_special()
In support of removing the VM_MIXEDMAP indication from DAX VMAs,
introduce pfn_t_special() for drivers to indicate that _PAGE_SPECIAL
should be used for DAX ptes. This also helps identify drivers like
dccssblk that only want to use DAX in a read-only fashion without
get_user_pages() support.
Ideally we could delete axonram and dcssblk DAX support, but if we need
to keep it better make it explicit that axonram and dcssblk only support
a sub-set of DAX due to missing _PAGE_DEVMAP support.
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/sysdev/axonram.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c index 1b307c80b401..cdbb0e59b3d3 100644 --- a/arch/powerpc/sysdev/axonram.c +++ b/arch/powerpc/sysdev/axonram.c @@ -151,7 +151,7 @@ __axon_ram_direct_access(struct axon_ram_bank *bank, pgoff_t pgoff, long nr_page resource_size_t offset = pgoff * PAGE_SIZE; *kaddr = (void *) bank->io_addr + offset; - *pfn = phys_to_pfn_t(bank->ph_addr + offset, PFN_DEV); + *pfn = phys_to_pfn_t(bank->ph_addr + offset, PFN_DEV|PFN_SPECIAL); return (bank->size - offset) / PAGE_SIZE; } |