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mm/hmm: do not differentiate between empty entry or missing directory

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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>
This commit is contained in:
Jérôme Glisse
2018-04-10 16:28:46 -07:00
committed by Linus Torvalds
parent 855ce7d252
commit 5504ed2969
2 changed files with 18 additions and 35 deletions
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8
include/linux/hmm.h
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@@ -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