From: Wei Yang <richardw.yang@linux.intel.com>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Wei Yang <richardw.yang@linux.intel.com>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, rientjes@google.com
Subject: Re: [Patch v2 2/4] mm/page_alloc.c: bad_[reason|flags] is not necessary when PageHWPoison
Date: Mon, 20 Jan 2020 20:13:15 +0800 [thread overview]
Message-ID: <20200120121315.GC18028@richard> (raw)
In-Reply-To: <3e7b4045-cd22-552a-c28d-1605a97bbdf7@arm.com>
On Mon, Jan 20, 2020 at 11:58:04AM +0530, Anshuman Khandual wrote:
>
>
>On 01/20/2020 08:34 AM, Wei Yang wrote:
>> Since function returns directly, bad_[reason|flags] is not used any
>> where.
>>
>> This is a following cleanup for commit e570f56cccd21 ("mm:
>> check_new_page_bad() directly returns in __PG_HWPOISON case")
>>
>> Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
>> Acked-by: David Rientjes <rientjes@google.com>
>> ---
>> mm/page_alloc.c | 2 --
>> 1 file changed, 2 deletions(-)
>>
>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>> index 0cf6218aaba7..a43b9d2482f2 100644
>> --- a/mm/page_alloc.c
>> +++ b/mm/page_alloc.c
>> @@ -2051,8 +2051,6 @@ static void check_new_page_bad(struct page *page)
>> if (unlikely(page_ref_count(page) != 0))
>> bad_reason = "nonzero _refcount";
>> if (unlikely(page->flags & __PG_HWPOISON)) {
>> - bad_reason = "HWPoisoned (hardware-corrupted)";
>> - bad_flags = __PG_HWPOISON;
>> /* Don't complain about hwpoisoned pages */
>> page_mapcount_reset(page); /* remove PageBuddy */
>> return;
>
>This bail out condition should be the first in the function
>check_new_page_bad() before evaluating bad_[reason|flags]
>as they will never be used.
>
This is reasonable.
>>
--
Wei Yang
Help you, Help me
next prev parent reply other threads:[~2020-01-20 12:13 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-20 3:04 [Patch v2 0/4] mm/page_alloc.c: cleanup on check page Wei Yang
2020-01-20 3:04 ` [Patch v2 1/4] mm: enable dump several reasons for __dump_page() Wei Yang
2020-01-20 6:12 ` Anshuman Khandual
2020-01-20 8:55 ` Wei Yang
2020-01-21 5:20 ` Anshuman Khandual
2020-01-22 0:58 ` Wei Yang
2020-01-26 2:44 ` Wei Yang
2020-01-20 3:04 ` [Patch v2 2/4] mm/page_alloc.c: bad_[reason|flags] is not necessary when PageHWPoison Wei Yang
2020-01-20 6:28 ` Anshuman Khandual
2020-01-20 12:13 ` Wei Yang [this message]
2020-01-20 10:17 ` Michal Hocko
2020-01-20 12:20 ` David Hildenbrand
2020-01-20 3:04 ` [Patch v2 3/4] mm/page_alloc.c: pass all bad reasons to bad_page() Wei Yang
2020-01-20 6:33 ` Anshuman Khandual
2020-01-20 12:33 ` Wei Yang
2020-01-20 10:22 ` Michal Hocko
2020-01-20 12:19 ` David Hildenbrand
2020-01-21 1:49 ` Wei Yang
2020-01-21 6:08 ` Anshuman Khandual
2020-01-21 8:47 ` Michal Hocko
2020-01-20 3:04 ` [Patch v2 4/4] mm/page_alloc.c: extract commom part to check page Wei Yang
2020-01-20 6:43 ` Anshuman Khandual
2020-01-20 12:36 ` Wei Yang
2020-01-21 4:49 ` Anshuman Khandual
2020-01-22 1:00 ` Wei Yang
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