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authorDan Williams <dan.j.williams@intel.com>2018-12-28 00:39:46 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-28 12:11:52 -0800
commit063a7d1d3623db31ca5d2309cab6030ebf93b72f (patch)
treedb21d6e0f9a623faa40bc2d9ac2dc1f43f5ba9a5 /kernel/memremap.c
parentc86aa7bbfd5568ba8a82d3635d8f7b8a8e06fe54 (diff)
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.c6
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 */