hugetlb: fix copy_hugetlb_page_range() to handle migration/hwpoisoned entry

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commit 4a705fef98 upstream.

There's a race between fork() and hugepage migration, as a result we try
to "dereference" a swap entry as a normal pte, causing kernel panic.
The cause of the problem is that copy_hugetlb_page_range() can't handle
"swap entry" family (migration entry and hwpoisoned entry) so let's fix
it.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Naoya Horiguchi 2014-06-23 13:22:03 -07:00 • committed by Greg Kroah-Hartman

parent e50eba3c09

commit fafacf16ff

1 changed files with 43 additions and 28 deletions

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mm/hugetlb.c

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