linux-kernel - Re: [PATCH] mm/cma: get nid from physical address

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Message-ID: <e41ea9022c217bb6aed5a8a4b8375a62878c9c8b@linux.dev>
Date: Thu, 16 May 2024 11:16:05 +0000
From: "Yajun Deng" <yajun.deng@...ux.dev>
To: "Kefeng Wang" <wangkefeng.wang@...wei.com>, akpm@...ux-foundation.org
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/cma: get nid from physical address

May 16, 2024 at 6:03 PM, "Kefeng Wang" <wangkefeng.wang@...wei.com> wrote:



> 
> On 2024/5/16 17:17, Yajun Deng wrote:
> 
> > 
> > The nid passed to cma_declare_contiguous_nid() may be NUMA_NO_NODE,
> > 
> >  which is not the actual nid. To get the correct nid, we can get the nid
> > 
> >  from physical address.
> > 
> 
> Please check
> 
> https://lore.kernel.org/linux-riscv/47437c2b-5946-41c6-ad1b-cc03329eb230@huawei.com/
> 

Okay, thanks!
> > 
> > Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
> > 
> >  ---
> > 
> >  mm/cma.c | 1 +
> > 
> >  1 file changed, 1 insertion(+)
> > 
> >  diff --git a/mm/cma.c b/mm/cma.c
> > 
> >  index 3e9724716bad..be6cdde32944 100644
> > 
> >  --- a/mm/cma.c
> > 
> >  +++ b/mm/cma.c
> > 
> >  @@ -361,6 +361,7 @@ int __init cma_declare_contiguous_nid(phys_addr_t base,
> > 
> >  kmemleak_ignore_phys(addr);
> > 
> >  base = addr;
> > 
> >  }
> > 
> >  + nid = early_pfn_to_nid(PHYS_PFN(base));
> > 
> >  > ret = cma_init_reserved_mem(base, size, order_per_bit, name, res_cma);
> > 
> >  if (ret)
> >
>