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Subject: Re: [RESEND PATCH v10 3/6] mm: page_alloc: reduce unnecessary binary
 search in memblock_next_valid_pfn()
To:     Pasha Tatashin <Pavel.Tatashin@microsoft.com>,
        Russell King <linux@armlinux.org.uk>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@suse.com>
Cc:     Wei Yang <richard.weiyang@gmail.com>,
        Kees Cook <keescook@chromium.org>,
        Laura Abbott <labbott@redhat.com>,
        Vladimir Murzin <vladimir.murzin@arm.com>,
        Philip Derrin <philip@cog.systems>,
        AKASHI Takahiro <takahiro.akashi@linaro.org>,
        James Morse <james.morse@arm.com>,
        Steve Capper <steve.capper@arm.com>,
        Pavel Tatashin <pasha.tatashin@oracle.com>,
        Gioh Kim <gi-oh.kim@profitbricks.com>,
        Vlastimil Babka <vbabka@suse.cz>, Mel Gorman <mgorman@suse.de>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Kemi Wang <kemi.wang@intel.com>,
        Petr Tesarik <ptesarik@suse.com>,
        YASUAKI ISHIMATSU <yasu.isimatu@gmail.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Nikolay Borisov <nborisov@suse.com>,
        Daniel Jordan <daniel.m.jordan@oracle.com>,
        Daniel Vacek <neelx@redhat.com>,
        Eugeniu Rosca <erosca@de.adit-jv.com>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        Jia He <jia.he@hxt-semitech.com>
References: <1530867675-9018-1-git-send-email-hejianet@gmail.com>
 <1530867675-9018-4-git-send-email-hejianet@gmail.com>
 <61ca29b9-a985-cce0-03e9-d216791c802c@microsoft.com>
From:   Jia He <hejianet@gmail.com>
Message-ID: <334337ca-811e-4a2e-09ff-65ebe37ef6df@gmail.com>
Date:   Tue, 21 Aug 2018 14:14:30 +0800
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Hi Pasha

On 8/17/2018 9:08 AM, Pasha Tatashin Wrote:
> 
>> Signed-off-by: Jia He <jia.he@hxt-semitech.com>
>> ---
>>  mm/memblock.c | 37 +++++++++++++++++++++++++++++--------
>>  1 file changed, 29 insertions(+), 8 deletions(-)
>>
>> diff --git a/mm/memblock.c b/mm/memblock.c
>> index ccad225..84f7fa7 100644
>> --- a/mm/memblock.c
>> +++ b/mm/memblock.c
>> @@ -1140,31 +1140,52 @@ int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size,
>>  #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
>>  
>>  #ifdef CONFIG_HAVE_MEMBLOCK_PFN_VALID
>> +static int early_region_idx __init_memblock = -1;
> 
> One comment:
> 
> This should be __initdata, but even better bring it inside the function
> as local static variable.
> 
Seems it should be __initdata_memblock instead of __initdata?

-- 
Cheers,
Jia
>>  ulong __init_memblock memblock_next_valid_pfn(ulong pfn)
>>  {
> 
> Otherwise looks good:
> 
> Reviewed-by: Pavel Tatashin <pavel.tatashin@microsoft.com>
>