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mm/page_vma_mapped: reformat map_pte() with less indentation

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No functional change here, but adjust the format of map_pte() so that the
following commit will be easier to read: separate out the PVMW_SYNC case
first, and remove two levels of indentation from the ZONE_DEVICE case.

Link: https://lkml.kernel.org/r/bf723f59-e3fc-6839-1cc3-c0631ee248bc@google.com
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Song Liu <song@kernel.org>
Cc: Steven Price <steven.price@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Zack Rusin <zackr@vmware.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2023-06-08 18:14:12 -07:00 committed by Andrew Morton
parent 45fe85e981
commit 90f43b0a13
1 changed files with 34 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
mm/page_vma_mapped.c
View File

@ -15,38 +15,41 @@ static inline bool not_found(struct page_vma_mapped_walk *pvmw)
static bool map_pte(struct page_vma_mapped_walk *pvmw)
{
pvmw->pte = pte_offset_map(pvmw->pmd, pvmw->address);
if (!(pvmw->flags & PVMW_SYNC)) {
if (pvmw->flags & PVMW_MIGRATION) {
if (!is_swap_pte(*pvmw->pte))
return false;
} else {
/*
* We get here when we are trying to unmap a private
* device page from the process address space. Such
* page is not CPU accessible and thus is mapped as
* a special swap entry, nonetheless it still does
* count as a valid regular mapping for the page (and
* is accounted as such in page maps count).
*
* So handle this special case as if it was a normal
* page mapping ie lock CPU page table and returns
* true.
*
* For more details on device private memory see HMM
* (include/linux/hmm.h or mm/hmm.c).
*/
if (is_swap_pte(*pvmw->pte)) {
swp_entry_t entry;
if (pvmw->flags & PVMW_SYNC) {
/* Use the stricter lookup */
pvmw->pte = pte_offset_map_lock(pvmw->vma->vm_mm, pvmw->pmd,
pvmw->address, &pvmw->ptl);
return true;
}
/* Handle un-addressable ZONE_DEVICE memory */
entry = pte_to_swp_entry(*pvmw->pte);
if (!is_device_private_entry(entry) &&
!is_device_exclusive_entry(entry))
return false;
} else if (!pte_present(*pvmw->pte))
return false;
}
pvmw->pte = pte_offset_map(pvmw->pmd, pvmw->address);
if (pvmw->flags & PVMW_MIGRATION) {
if (!is_swap_pte(*pvmw->pte))
return false;
} else if (is_swap_pte(*pvmw->pte)) {
swp_entry_t entry;
/*
* Handle un-addressable ZONE_DEVICE memory.
*
* We get here when we are trying to unmap a private
* device page from the process address space. Such
* page is not CPU accessible and thus is mapped as
* a special swap entry, nonetheless it still does
* count as a valid regular mapping for the page
* (and is accounted as such in page maps count).
*
* So handle this special case as if it was a normal
* page mapping ie lock CPU page table and return true.
*
* For more details on device private memory see HMM
* (include/linux/hmm.h or mm/hmm.c).
*/
entry = pte_to_swp_entry(*pvmw->pte);
if (!is_device_private_entry(entry) &&
!is_device_exclusive_entry(entry))
return false;
} else if (!pte_present(*pvmw->pte)) {
return false;
}
pvmw->ptl = pte_lockptr(pvmw->vma->vm_mm, pvmw->pmd);
spin_lock(pvmw->ptl);