From: Dave Hansen <dave.hansen@linux.intel.com>
To: "Huang, Ying" <ying.huang@intel.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Michal Hocko <mhocko@suse.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Shaohua Li <shli@kernel.org>, Hugh Dickins <hughd@google.com>,
Minchan Kim <minchan@kernel.org>, Rik van Riel <riel@redhat.com>,
Daniel Jordan <daniel.m.jordan@oracle.com>,
Dan Williams <dan.j.williams@intel.com>
Subject: Re: [PATCH v2 2/7] mm/swapfile.c: Replace some #ifdef with IS_ENABLED()
Date: Tue, 17 Jul 2018 11:32:48 -0700 [thread overview]
Message-ID: <10878744-8db0-1d2c-e899-7c132d78e153@linux.intel.com> (raw)
In-Reply-To: <20180717005556.29758-3-ying.huang@intel.com>
> @@ -878,6 +877,11 @@ static int swap_alloc_cluster(struct swap_info_struct *si, swp_entry_t *slot)
> unsigned long offset, i;
> unsigned char *map;
>
> + if (!IS_ENABLED(CONFIG_THP_SWAP)) {
> + VM_WARN_ON_ONCE(1);
> + return 0;
> + }
I see you seized the opportunity to keep this code gloriously
unencumbered by pesky comments. This seems like a time when you might
have slipped up and been temped to add a comment or two. Guess not. :)
Seriously, though, does it hurt us to add a comment or two to say
something like:
/*
* Should not even be attempting cluster allocations when
* huge page swap is disabled. Warn and fail the allocation.
*/
if (!IS_ENABLED(CONFIG_THP_SWAP)) {
VM_WARN_ON_ONCE(1);
return 0;
}
next prev parent reply other threads:[~2018-07-17 18:32 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-17 0:55 [PATCH v2 0/7] swap: THP optimizing refactoring Huang, Ying
2018-07-17 0:55 ` [PATCH v2 1/7] swap: Add comments to lock_cluster_or_swap_info() Huang, Ying
2018-07-17 18:27 ` Dave Hansen
2018-07-18 3:09 ` Huang, Ying
2018-07-17 0:55 ` [PATCH v2 2/7] mm/swapfile.c: Replace some #ifdef with IS_ENABLED() Huang, Ying
2018-07-17 18:32 ` Dave Hansen [this message]
2018-07-18 3:25 ` Huang, Ying
2018-07-18 15:15 ` Dave Hansen
2018-07-19 4:42 ` Huang, Ying
2018-07-17 0:55 ` [PATCH v2 3/7] swap: Use swap_count() in swap_page_trans_huge_swapped() Huang, Ying
2018-07-17 0:55 ` [PATCH v2 4/7] swap: Unify normal/huge code path " Huang, Ying
2018-07-17 0:55 ` [PATCH v2 5/7] swap: Unify normal/huge code path in put_swap_page() Huang, Ying
2018-07-17 0:55 ` [PATCH v2 6/7] swap: Add __swap_entry_free_locked() Huang, Ying
2018-07-17 0:55 ` [PATCH v2 7/7] swap, put_swap_page: Share more between huge/normal code path Huang, Ying
2018-07-17 18:36 ` Dave Hansen
2018-07-18 2:56 ` Huang, Ying
2018-07-18 15:13 ` Dave Hansen
2018-07-17 15:17 ` [PATCH v2 0/7] swap: THP optimizing refactoring Daniel Jordan
2018-07-18 2:56 ` Huang, Ying
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