linux-kernel - Re: [PATCH] mm: add pmd_t initializer _

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Message-Id: <20170810.150458.937727046893542981.davem@davemloft.net>
Date:   Thu, 10 Aug 2017 15:04:58 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     zi.yan@...t.com
Cc:     sam@...nborg.org, linux-kernel@...r.kernel.org,
        sparclinux@...r.kernel.org, zi.yan@...rutgers.edu
Subject: Re: [PATCH] mm: add pmd_t initializer __pmd() to work around a GCC
 bug.

From: Zi Yan <zi.yan@...t.com>
Date: Thu,  3 Aug 2017 09:17:21 -0400

> From: Zi Yan <zi.yan@...rutgers.edu>
> 
> THP migration is added but only supports x86_64 at the moment. For all
> other architectures, swp_entry_to_pmd() only returns a zero pmd_t.
> 
> Due to a GCC zero initializer bug #53119, the standard (pmd_t){0}
> initializer is not accepted by all GCC versions. __pmd() is a feasible
> workaround. In addition, sparc32's pmd_t is an array instead of a single
> value, so we need (pmd_t){ {0}, } instead of (pmd_t){0}. Thus,
> a different __pmd() definition is needed in sparc32.
> 
> Signed-off-by: Zi Yan <zi.yan@...rutgers.edu>

Applied.