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authorJérôme Glisse <jglisse@redhat.com>2018-04-11 02:28:46 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-11 20:28:30 +0300
commit5504ed29692faad06ea74c4275e96a8ffc83a1e1 (patch)
treefc5b15aa9076aeedd248c339b442ca7ad5c372e7 /include/linux/hmm.h
parent855ce7d2525c97cf706ad82a419f0c2d632b9481 (diff)
downloadlinux-5504ed29692faad06ea74c4275e96a8ffc83a1e1.tar.xz
mm/hmm: do not differentiate between empty entry or missing directory
There is no point in differentiating between a range for which there is not even a directory (and thus entries) and empty entry (pte_none() or pmd_none() returns true). Simply drop the distinction ie remove HMM_PFN_EMPTY flag and merge now duplicate hmm_vma_walk_hole() and hmm_vma_walk_clear() functions. Link: http://lkml.kernel.org/r/20180323005527.758-11-jglisse@redhat.com Signed-off-by: Jérôme Glisse <jglisse@redhat.com> Reviewed-by: John Hubbard <jhubbard@nvidia.com> Cc: Evgeny Baskakov <ebaskakov@nvidia.com> Cc: Ralph Campbell <rcampbell@nvidia.com> Cc: Mark Hairgrove <mhairgrove@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/hmm.h')
-rw-r--r--include/linux/hmm.h8
1 files changed, 3 insertions, 5 deletions
diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index 54d684fe3b90..cf283db22106 100644
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -84,7 +84,6 @@ struct hmm;
* HMM_PFN_VALID: pfn is valid. It has, at least, read permission.
* HMM_PFN_WRITE: CPU page table has write permission set
* HMM_PFN_ERROR: corresponding CPU page table entry points to poisoned memory
- * HMM_PFN_EMPTY: corresponding CPU page table entry is pte_none()
* HMM_PFN_SPECIAL: corresponding CPU page table entry is special; i.e., the
* result of vm_insert_pfn() or vm_insert_page(). Therefore, it should not
* be mirrored by a device, because the entry will never have HMM_PFN_VALID
@@ -94,10 +93,9 @@ struct hmm;
#define HMM_PFN_VALID (1 << 0)
#define HMM_PFN_WRITE (1 << 1)
#define HMM_PFN_ERROR (1 << 2)
-#define HMM_PFN_EMPTY (1 << 3)
-#define HMM_PFN_SPECIAL (1 << 4)
-#define HMM_PFN_DEVICE_UNADDRESSABLE (1 << 5)
-#define HMM_PFN_SHIFT 6
+#define HMM_PFN_SPECIAL (1 << 3)
+#define HMM_PFN_DEVICE_UNADDRESSABLE (1 << 4)
+#define HMM_PFN_SHIFT 5
/*
* hmm_pfn_to_page() - return struct page pointed to by a valid HMM pfn