linux-kernel - Re: [PATCH v2 2/8] riscv: mm: Change attribute from __init to _

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Message-ID: <87r0e3k502.fsf@all.your.base.are.belong.to.us>
Date: Wed, 15 May 2024 07:39:57 +0200
From: Björn Töpel <bjorn@...nel.org>
To: Oscar Salvador <osalvador@...e.de>
Cc: Alexandre Ghiti <alexghiti@...osinc.com>, Albert Ou
 <aou@...s.berkeley.edu>, David Hildenbrand <david@...hat.com>, Palmer
 Dabbelt <palmer@...belt.com>, Paul Walmsley <paul.walmsley@...ive.com>,
 linux-riscv@...ts.infradead.org, Björn Töpel
 <bjorn@...osinc.com>, Andrew
 Bresticker <abrestic@...osinc.com>, Chethan Seshadri
 <Chethan.Seshadri@...alinasystems.io>, Lorenzo Stoakes
 <lstoakes@...il.com>, Santosh Mamila <santosh.mamila@...alinasystems.io>,
 Sivakumar Munnangi <siva.munnangi@...alinasystems.io>, Sunil V L
 <sunilvl@...tanamicro.com>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 2/8] riscv: mm: Change attribute from __init to
 __meminit for page functions

Oscar Salvador <osalvador@...e.de> writes:

> On Tue, May 14, 2024 at 04:04:40PM +0200, Björn Töpel wrote:
>> From: Björn Töpel <bjorn@...osinc.com>
>> 
>> Prepare for memory hotplugging support by changing from __init to
>> __meminit for the page table functions that are used by the upcoming
>> architecture specific callbacks.
>> 
>> Changing the __init attribute to __meminit, avoids that the functions
>> are removed after init. The __meminit attribute makes sure the
>> functions are kept in the kernel text post init, but only if memory
>> hotplugging is enabled for the build.
>> 
>> Also, make sure that the altmap parameter is properly passed on to
>> vmemmap_populate_hugepages().
>> 
>> Signed-off-by: Björn Töpel <bjorn@...osinc.com>
>
> Reviewed-by: Oscar Salvador <osalvador@...e.de>
>
>> +static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t end,
>> +						  uintptr_t fixed_map_size)
>>  {
>>  	phys_addr_t pa;
>>  	uintptr_t va, map_size;
>> @@ -1435,7 +1429,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
>>  	 * memory hotplug, we are not able to update all the page tables with
>>  	 * the new PMDs.
>>  	 */
>> -	return vmemmap_populate_hugepages(start, end, node, NULL);
>> +	return vmemmap_populate_hugepages(start, end, node, altmap);
>
> I would have put this into a separate patch.

Thanks for the review, Oscar!

I'll split this up (also suggested by Alex!).


Cheers,
Björn