linux-kernel - Re: [PATCH 1/4] mm: ioremap: Setup phys_addr of struct vm

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Date:   Thu, 28 Apr 2022 09:40:37 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH 1/4] mm: ioremap: Setup phys_addr of struct vm_struct


On 2022/4/28 1:10, Andrew Morton wrote:
> On Wed, 27 Apr 2022 20:14:10 +0800 Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
>
>> Show physical address in /proc/vmallocinfo.
>>
>> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
>> ---
>>   mm/ioremap.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/mm/ioremap.c b/mm/ioremap.c
>> index 5fe598ecd9b7..522ef899c35f 100644
>> --- a/mm/ioremap.c
>> +++ b/mm/ioremap.c
>> @@ -32,6 +32,7 @@ void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
>>   	if (!area)
>>   		return NULL;
>>   	vaddr = (unsigned long)area->addr;
>> +	area->phys_addr = addr;
>>   
>>   	if (ioremap_page_range(vaddr, vaddr + size, addr, __pgprot(prot))) {
>>   		free_vm_area(area);
> Acked-by: Andrew Morton <akpm@...ux-foundation.org>
>
> I checked a bunch of arch-specific implementations of ioremap_prot()
> and they're already doing this.  As far as I can tell, only csky and
> riscv actually use this file (CONFIG_GENERIC_IOREMAP=y).  But you're
> ARM(?) so I'm wondering how come you're patching it?

Hi Andrew,

I found this via reading code when debug some other issue, meanwhile,  there

are some code duplication of ioremap between arm64 and generic ioremap, so

1) bugfix: fix the above issue and test on riscv

2) cleanup: convert arm64 to use GENERIC_IOREMAP,

3) feature: after that, enable HAVE_IOREMAP_PROT on arm64

>
> Someone should do s/addr/phys_addr/ in this function, like the rest of
> the world (sensibly) does.
I will make it in next version.
>
>
> .