mm/mprotect.c: avoid repeated assignment in do_mprotect_pkey()
After adjustment, the repeated assignment of "prev" is avoided, and the readability of the code is improved. Link: https://lkml.kernel.org/r/20211012152444.4127-1-fishland@aliyun.com Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Liu Song <liu.song11@zte.com.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -563,7 +563,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
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error = -ENOMEM;
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error = -ENOMEM;
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if (!vma)
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if (!vma)
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goto out;
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goto out;
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prev = vma->vm_prev;
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if (unlikely(grows & PROT_GROWSDOWN)) {
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if (unlikely(grows & PROT_GROWSDOWN)) {
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if (vma->vm_start >= end)
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if (vma->vm_start >= end)
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goto out;
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goto out;
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@ -581,8 +581,11 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
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goto out;
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goto out;
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}
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}
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}
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}
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if (start > vma->vm_start)
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if (start > vma->vm_start)
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prev = vma;
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prev = vma;
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else
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prev = vma->vm_prev;
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for (nstart = start ; ; ) {
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for (nstart = start ; ; ) {
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unsigned long mask_off_old_flags;
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unsigned long mask_off_old_flags;
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