xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mm/hmm: Use hmm_mirror not mm as an argument for hmm_range_register

Browse Source 
Ralph observes that hmm_range_register() can only be called by a driver
while a mirror is registered. Make this clear in the API by passing in the
mirror structure as a parameter.

This also simplifies understanding the lifetime model for struct hmm, as
the hmm pointer must be valid as part of a registered mirror so all we
need in hmm_register_range() is a simple kref_get.

Suggested-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Philip Yang <Philip.Yang@amd.com>
This commit is contained in:
Jason Gunthorpe
2019-05-23 09:41:19 -03:00
parent 6d7c3cde93
commit e36acfe6c8
3 changed files with 9 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/hmm.h
View File

@@ -496,7 +496,7 @@ static inline bool hmm_mirror_mm_is_alive(struct hmm_mirror *mirror)
* Please see Documentation/vm/hmm.rst for how to use the range API.
*/
int hmm_range_register(struct hmm_range *range,
struct mm_struct *mm,
struct hmm_mirror *mirror,
unsigned long start,
unsigned long end,
unsigned page_shift);
@@ -532,7 +532,8 @@ static inline bool hmm_vma_range_done(struct hmm_range *range)
}
/* This is a temporary helper to avoid merge conflict between trees. */
static inline int hmm_vma_fault(struct hmm_range *range, bool block)
static inline int hmm_vma_fault(struct hmm_mirror *mirror,
struct hmm_range *range, bool block)
{
long ret;
@@ -545,7 +546,7 @@ static inline int hmm_vma_fault(struct hmm_range *range, bool block)
range->default_flags = 0;
range->pfn_flags_mask = -1UL;
ret = hmm_range_register(range, range->vma->vm_mm,
ret = hmm_range_register(range, mirror,
range->start, range->end,
PAGE_SHIFT);
if (ret)