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| author | Dan Williams <dan.j.williams@intel.com> | 2018-12-28 00:39:46 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-28 12:11:52 -0800 |
| commit | 063a7d1d3623db31ca5d2309cab6030ebf93b72f (patch) | |
| tree | db21d6e0f9a623faa40bc2d9ac2dc1f43f5ba9a5 /kernel/memremap.c | |
| parent | c86aa7bbfd5568ba8a82d3635d8f7b8a8e06fe54 (diff) | |
| download | lwn-063a7d1d3623db31ca5d2309cab6030ebf93b72f.tar.gz lwn-063a7d1d3623db31ca5d2309cab6030ebf93b72f.zip | |
mm/hmm: fix memremap.h, move dev_page_fault_t callback to hmm
The kbuild robot reported the following on a development branch that used
memremap.h in a new path:
In file included from arch/m68k/include/asm/pgtable_mm.h:148:0,
from arch/m68k/include/asm/pgtable.h:5,
from include/linux/memremap.h:7,
from drivers//dax/bus.c:3:
arch/m68k/include/asm/motorola_pgtable.h: In function 'pgd_offset':
>> arch/m68k/include/asm/motorola_pgtable.h:199:11: error: dereferencing pointer to incomplete type 'const struct mm_struct'
return mm->pgd + pgd_index(address);
^~
The ->page_fault() callback is specific to HMM. Move it to 'struct
hmm_devmem' where the unusual asm/pgtable.h dependency can be contained in
include/linux/hmm.h. Longer term refactoring this dependency out of HMM
is recommended, but in the meantime memremap.h remains generic.
Link: http://lkml.kernel.org/r/154534090899.3120190.6652620807617715272.stgit@dwillia2-desk3.amr.corp.intel.com
Fixes: 5042db43cc26 ("mm/ZONE_DEVICE: new type of ZONE_DEVICE memory...")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/memremap.c')
| -rw-r--r-- | kernel/memremap.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/memremap.c b/kernel/memremap.c index 0d5603d76c37..a856cb5ff192 100644 --- a/kernel/memremap.c +++ b/kernel/memremap.c @@ -11,6 +11,7 @@ #include <linux/types.h> #include <linux/wait_bit.h> #include <linux/xarray.h> +#include <linux/hmm.h> static DEFINE_XARRAY(pgmap_array); #define SECTION_MASK ~((1UL << PA_SECTION_SHIFT) - 1) @@ -24,6 +25,9 @@ vm_fault_t device_private_entry_fault(struct vm_area_struct *vma, pmd_t *pmdp) { struct page *page = device_private_entry_to_page(entry); + struct hmm_devmem *devmem; + + devmem = container_of(page->pgmap, typeof(*devmem), pagemap); /* * The page_fault() callback must migrate page back to system memory @@ -39,7 +43,7 @@ vm_fault_t device_private_entry_fault(struct vm_area_struct *vma, * There is a more in-depth description of what that callback can and * cannot do, in include/linux/memremap.h */ - return page->pgmap->page_fault(vma, addr, page, flags, pmdp); + return devmem->page_fault(vma, addr, page, flags, pmdp); } EXPORT_SYMBOL(device_private_entry_fault); #endif /* CONFIG_DEVICE_PRIVATE */ |