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userfaultfd: remove unnecessary WARN_ON() in __mcopy_atomic_hugetlb()

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These warning here is to make sure address(dst_addr) and length(len -
copied) are huge page size aligned.

While this is ensured by:

    dst_start and len is huge page size aligned
    dst_addr equals to dst_start and increase huge page size each time
    copied increase huge page size each time

This means these warnings will never be triggered.

Link: http://lkml.kernel.org/r/20190927070032.2129-2-richardw.yang@linux.intel.com
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wei Yang 2019-11-30 17:57:52 -08:00 committed by Linus Torvalds
parent 4fb07ee651
commit 53eaa14b62
1 changed files with 0 additions and 5 deletions
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5
mm/userfaultfd.c
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@ -242,10 +242,6 @@ retry:
vm_shared = dst_vma->vm_flags & VM_SHARED;
}
if (WARN_ON(dst_addr & (vma_hpagesize - 1) ||
(len - copied) & (vma_hpagesize - 1)))
goto out_unlock;
/*
* If not shared, ensure the dst_vma has a anon_vma.
*/
@ -259,7 +255,6 @@ retry:
pte_t dst_pteval;
BUG_ON(dst_addr >= dst_start + len);
VM_BUG_ON(dst_addr & (vma_hpagesize - 1));
/*
* Serialize via hugetlb_fault_mutex