From: Matthew Wilcox <willy@infradead.org>
To: Ralph Campbell <rcampbell@nvidia.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Jerome Glisse <jglisse@redhat.com>,
John Hubbard <jhubbard@nvidia.com>,
Christoph Hellwig <hch@lst.de>,
Jason Gunthorpe <jgg@mellanox.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] mm/hmm: remove redundant check non_swap_entry()
Date: Fri, 12 Jun 2020 12:35:24 -0700 [thread overview]
Message-ID: <20200612193524.GL8681@bombadil.infradead.org> (raw)
In-Reply-To: <20200612192618.32579-1-rcampbell@nvidia.com>
On Fri, Jun 12, 2020 at 12:26:18PM -0700, Ralph Campbell wrote:
> In zap_pte_range(), the check for non_swap_entry() and
> is_device_private_entry() is redundant since the latter is a subset of the
> former. Remove the redundant check to simplify the code and for clarity.
That is highly configuration dependent.
#else /* CONFIG_DEVICE_PRIVATE */
...
static inline bool is_device_private_entry(swp_entry_t entry)
{
return false;
}
...
#if defined(CONFIG_MEMORY_FAILURE) || defined(CONFIG_MIGRATION) || \
defined(CONFIG_DEVICE_PRIVATE)
static inline int non_swap_entry(swp_entry_t entry)
{
return swp_type(entry) >= MAX_SWAPFILES;
}
#else
static inline int non_swap_entry(swp_entry_t entry)
{
return 0;
}
#endif
next prev parent reply other threads:[~2020-06-12 19:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-12 19:26 Ralph Campbell
2020-06-12 19:33 ` Jason Gunthorpe
2020-06-12 19:48 ` Ralph Campbell
2020-06-12 19:35 ` Matthew Wilcox [this message]
2020-06-12 19:42 ` Jason Gunthorpe
2020-06-12 19:53 ` Ralph Campbell
2020-06-12 19:55 ` Jason Gunthorpe
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