Blame nptl/stack-aliasing.h

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/* Define macros for stack address aliasing issues for NPTL.  Stub version.
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   Copyright (C) 2014-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, see
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   <http://www.gnu.org/licenses/>.  */
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/* This is a number of bytes that is an alignment that should be avoided
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   when choosing the exact size of a new thread's stack.  If the size
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   chosen is aligned to this, an extra page will be added to render the
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   size off-aligned.  */
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#define MULTI_PAGE_ALIASING     0