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hugetlb: update vma flag check for hugetlb vma lock 

JIRA: https://issues.redhat.com/browse/RHEL-1848

commit 379c2e60e82ff71510a949033bf8431f39f66c75
Author: Mike Kravetz <mike.kravetz@oracle.com>
Date:   Mon Dec 12 15:50:42 2022 -0800

    hugetlb: update vma flag check for hugetlb vma lock

    The check for whether a hugetlb vma lock exists partially depends on the
    vma's flags.  Currently, it checks for either VM_MAYSHARE or VM_SHARED.
    The reason both flags are used is because VM_MAYSHARE was previously
    cleared in hugetlb vmas as they are tore down.  This is no longer the
    case, and only the VM_MAYSHARE check is required.

    Link: https://lkml.kernel.org/r/20221212235042.178355-2-mike.kravetz@oracle.com
    Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
    Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
    Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
    Cc: David Hildenbrand <david@redhat.com>
    Cc: James Houghton <jthoughton@google.com>
    Cc: Mina Almasry <almasrymina@google.com>
    Cc: Muchun Song <songmuchun@bytedance.com>
    Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev>
    Cc: Peter Xu <peterx@redhat.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Signed-off-by: Chris von Recklinghausen <crecklin@redhat.com>
This commit is contained in:
Chris von Recklinghausen 2023-10-20 06:15:43 -04:00
parent 653ae76632
commit 809793f9b9
1 changed files with 1 additions and 2 deletions
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3
mm/hugetlb.c
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@ -260,8 +260,7 @@ static inline struct hugepage_subpool *subpool_vma(struct vm_area_struct *vma)
*/
static bool __vma_shareable_lock(struct vm_area_struct *vma)
{
return vma->vm_flags & (VM_MAYSHARE | VM_SHARED) &&
vma->vm_private_data;
return vma->vm_flags & VM_MAYSHARE && vma->vm_private_data;
}
void hugetlb_vma_lock_read(struct vm_area_struct *vma)