diff options
author | Ralph Campbell <rcampbell@nvidia.com> | 2019-07-26 03:56:45 +0300 |
---|---|---|
committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-07-26 17:10:53 +0300 |
commit | d2e8d551165ccb6669a0d0273be01ac99d61deba (patch) | |
tree | f5b494f92143d716b6b0b5943cbefdc31cf6e81f /mm | |
parent | 1f961807925032daa90267d8a23ff730e7ede07a (diff) | |
download | linux-d2e8d551165ccb6669a0d0273be01ac99d61deba.tar.xz |
mm/hmm: a few more C style and comment clean ups
A few more comments and minor programming style clean ups. There should
be no functional changes.
Link: https://lore.kernel.org/r/20190726005650.2566-3-rcampbell@nvidia.com
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/hmm.c | 39 |
1 files changed, 17 insertions, 22 deletions
@@ -32,7 +32,7 @@ static const struct mmu_notifier_ops hmm_mmu_notifier_ops; * hmm_get_or_create - register HMM against an mm (HMM internal) * * @mm: mm struct to attach to - * Returns: returns an HMM object, either by referencing the existing + * Return: an HMM object, either by referencing the existing * (per-process) object, or by creating a new one. * * This is not intended to be used directly by device drivers. If mm already @@ -325,8 +325,8 @@ static int hmm_pfns_bad(unsigned long addr, } /* - * hmm_vma_walk_hole() - handle a range lacking valid pmd or pte(s) - * @start: range virtual start address (inclusive) + * hmm_vma_walk_hole_() - handle a range lacking valid pmd or pte(s) + * @addr: range virtual start address (inclusive) * @end: range virtual end address (exclusive) * @fault: should we fault or not ? * @write_fault: write fault ? @@ -376,9 +376,9 @@ static inline void hmm_pte_need_fault(const struct hmm_vma_walk *hmm_vma_walk, /* * So we not only consider the individual per page request we also * consider the default flags requested for the range. The API can - * be use in 2 fashions. The first one where the HMM user coalesce - * multiple page fault into one request and set flags per pfns for - * of those faults. The second one where the HMM user want to pre- + * be used 2 ways. The first one where the HMM user coalesces + * multiple page faults into one request and sets flags per pfn for + * those faults. The second one where the HMM user wants to pre- * fault a range with specific flags. For the latter one it is a * waste to have the user pre-fill the pfn arrays with a default * flags value. @@ -388,7 +388,7 @@ static inline void hmm_pte_need_fault(const struct hmm_vma_walk *hmm_vma_walk, /* We aren't ask to do anything ... */ if (!(pfns & range->flags[HMM_PFN_VALID])) return; - /* If this is device memory than only fault if explicitly requested */ + /* If this is device memory then only fault if explicitly requested */ if ((cpu_flags & range->flags[HMM_PFN_DEVICE_PRIVATE])) { /* Do we fault on device memory ? */ if (pfns & range->flags[HMM_PFN_DEVICE_PRIVATE]) { @@ -502,7 +502,7 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk, hmm_vma_walk->last = end; return 0; #else - /* If THP is not enabled then we should never reach that code ! */ + /* If THP is not enabled then we should never reach this code ! */ return -EINVAL; #endif } @@ -522,7 +522,6 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr, { struct hmm_vma_walk *hmm_vma_walk = walk->private; struct hmm_range *range = hmm_vma_walk->range; - struct vm_area_struct *vma = walk->vma; bool fault, write_fault; uint64_t cpu_flags; pte_t pte = *ptep; @@ -571,8 +570,7 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr, if (fault || write_fault) { pte_unmap(ptep); hmm_vma_walk->last = addr; - migration_entry_wait(vma->vm_mm, - pmdp, addr); + migration_entry_wait(walk->mm, pmdp, addr); return -EBUSY; } return 0; @@ -620,13 +618,11 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp, { struct hmm_vma_walk *hmm_vma_walk = walk->private; struct hmm_range *range = hmm_vma_walk->range; - struct vm_area_struct *vma = walk->vma; uint64_t *pfns = range->pfns; unsigned long addr = start, i; pte_t *ptep; pmd_t pmd; - again: pmd = READ_ONCE(*pmdp); if (pmd_none(pmd)) @@ -648,7 +644,7 @@ again: 0, &fault, &write_fault); if (fault || write_fault) { hmm_vma_walk->last = addr; - pmd_migration_entry_wait(vma->vm_mm, pmdp); + pmd_migration_entry_wait(walk->mm, pmdp); return -EBUSY; } return 0; @@ -657,11 +653,11 @@ again: if (pmd_devmap(pmd) || pmd_trans_huge(pmd)) { /* - * No need to take pmd_lock here, even if some other threads + * No need to take pmd_lock here, even if some other thread * is splitting the huge pmd we will get that event through * mmu_notifier callback. * - * So just read pmd value and check again its a transparent + * So just read pmd value and check again it's a transparent * huge or device mapping one and compute corresponding pfn * values. */ @@ -675,7 +671,7 @@ again: } /* - * We have handled all the valid case above ie either none, migration, + * We have handled all the valid cases above ie either none, migration, * huge or transparent huge. At this point either it is a valid pmd * entry pointing to pte directory or it is a bad pmd that will not * recover. @@ -795,10 +791,10 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask, pte_t entry; int ret = 0; - size = 1UL << huge_page_shift(h); + size = huge_page_size(h); mask = size - 1; if (range->page_shift != PAGE_SHIFT) { - /* Make sure we are looking at full page. */ + /* Make sure we are looking at a full page. */ if (start & mask) return -EINVAL; if (end < (start + size)) @@ -809,8 +805,7 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask, size = PAGE_SIZE; } - - ptl = huge_pte_lock(hstate_vma(walk->vma), walk->mm, pte); + ptl = huge_pte_lock(hstate_vma(vma), walk->mm, pte); entry = huge_ptep_get(pte); i = (start - range->start) >> range->page_shift; @@ -859,7 +854,7 @@ static void hmm_pfns_clear(struct hmm_range *range, * @start: start virtual address (inclusive) * @end: end virtual address (exclusive) * @page_shift: expect page shift for the range - * Returns 0 on success, -EFAULT if the address space is no longer valid + * Return: 0 on success, -EFAULT if the address space is no longer valid * * Track updates to the CPU page table see include/linux/hmm.h */ |