linux-kernel - Re: [PATCH 2/4] mm/memblock: introduce memblock_search_pfn

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 21 Mar 2018 20:04:22 +0800
From:   Jia He <hejianet@...il.com>
To:     Daniel Vacek <neelx@...hat.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Mel Gorman <mgorman@...e.de>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        Gioh Kim <gi-oh.kim@...fitbricks.com>,
        Steven Sistare <steven.sistare@...cle.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        open list <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        James Morse <james.morse@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Steve Capper <steve.capper@....com>, x86@...nel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Kemi Wang <kemi.wang@...el.com>,
        Petr Tesarik <ptesarik@...e.com>,
        YASUAKI ISHIMATSU <yasu.isimatu@...il.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Nikolay Borisov <nborisov@...e.com>,
        Jia He <jia.he@...-semitech.com>
Subject: Re: [PATCH 2/4] mm/memblock: introduce memblock_search_pfn_regions()

Hi Daniel

Thanks for the review


On 3/21/2018 6:14 PM, Daniel Vacek Wrote:
> On Wed, Mar 21, 2018 at 9:09 AM, Jia He <hejianet@...il.com> wrote:
>> This api is the preparation for further optimizing early_pfn_valid
>>
>> Signed-off-by: Jia He <jia.he@...-semitech.com>
>> ---
>>   include/linux/memblock.h |  2 ++
>>   mm/memblock.c            | 12 ++++++++++++
>>   2 files changed, 14 insertions(+)
>>
>> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
>> index 9471db4..5f46956 100644
>> --- a/include/linux/memblock.h
>> +++ b/include/linux/memblock.h
>> @@ -203,6 +203,8 @@ void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
>>               i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
>>   #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
>>
>> +int memblock_search_pfn_regions(unsigned long pfn);
>> +
>>   unsigned long memblock_next_valid_pfn(unsigned long pfn, int *last_idx);
>>   /**
>>    * for_each_free_mem_range - iterate through free memblock areas
>> diff --git a/mm/memblock.c b/mm/memblock.c
>> index a9e8da4..f50fe5b 100644
>> --- a/mm/memblock.c
>> +++ b/mm/memblock.c
>> @@ -1659,6 +1659,18 @@ static int __init_memblock memblock_search(struct memblock_type *type, phys_addr
>>          return -1;
>>   }
>>
>> +/* search memblock with the input pfn, return the region idx */
>> +int __init_memblock memblock_search_pfn_regions(unsigned long pfn)
>> +{
>> +       struct memblock_type *type = &memblock.memory;
>> +       int mid = memblock_search(type, PFN_PHYS(pfn));
>> +
>> +       if (mid == -1)
>> +               return -1;
> Why this?
Yes, it is redudant and can be removed.
Thanks

Cheers,
Jia