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thank you Ying, it's a n= ew record, i get a reviewed-by in 5 minutes


From: Huang, Ying <ying.= huang@linux.alibaba.com>
Sent: Tuesday, June 10, 2025 2:33:10 PM
To: Li, Zhijian/=C0=EE =D6=C7=BC=E1 <lizhijian@fujitsu.com> Cc: linux-mm@kvack.org <linux-mm@kvack.org>; akpm@linux-founda= tion.org <akpm@linux-foundation.org>; linux-kernel@vger.kernel.org &l= t;linux-kernel@vger.kernel.org>; Ying Huang <huang.ying.caritas@gmail= .com>
Subject: Re: [PATCH] mm/memory-tier: Fix abstract distance calculati= on overflow
 
Li Zhijian <lizhijian@fujitsu.com> writes:
> In mt_perf_to_adistance(), the calculation of abstract distance (adist= )
> involves multiplying several int values including MEMTIER_ADISTANCE_DR= AM.
> ```
> *adist =3D MEMTIER_ADISTANCE_DRAM *
>            = ;    (perf->read_latency + perf->write_latency) /
>            = ;    (default_dram_perf.read_latency + default_dram_perf.wri= te_latency) *
>            = ;    (default_dram_perf.read_bandwidth + default_dram_perf.w= rite_bandwidth) /
>            = ;    (perf->read_bandwidth + perf->write_bandwidth); > ```
> Since these values can be large, the multiplication may exceed the max= imum
> value of an int (INT_MAX) and overflow (Our platform did), leading to = an
> incorrect adist.
>
> Change MEMTIER_ADISTANCE_DRAM to be a long constant by writing it with= the
> 'L' suffix. This prevents the overflow because the multiplication will= then
> be done in the long type which has a larger range.
>
> Fixes: 3718c02dbd4c ("acpi, hmat: calculate abstract distance wit= h HMAT")
> Cc: Ying Huang <huang.ying.caritas@gmail.com>
> Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>

Good catch!  Feel free to add

Reviewed-by: Huang Ying <ying.huang@linux.alibaba.com>

in the future version.

---
Best Regards,
Huang, Ying

[snip]
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