linux-kernel - Re: [PATCH v5 5/7] selftest/mm: Extract sz2ord function into vm

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Message-ID: <2aaa9982-48c7-4461-8be8-1427d9ed3f3d@redhat.com>
Date: Sat, 16 Aug 2025 08:24:07 +0200
From: David Hildenbrand <david@...hat.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
 Usama Arif <usamaarif642@...il.com>
Cc: linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, corbet@....net,
 rppt@...nel.org, surenb@...gle.com, mhocko@...e.com, hannes@...xchg.org,
 baohua@...nel.org, shakeel.butt@...ux.dev, riel@...riel.com, ziy@...dia.com,
 laoar.shao@...il.com, dev.jain@....com, baolin.wang@...ux.alibaba.com,
 npache@...hat.com, lorenzo.stoakes@...cle.com, Liam.Howlett@...cle.com,
 ryan.roberts@....com, vbabka@...e.cz, jannh@...gle.com,
 Arnd Bergmann <arnd@...db.de>, sj@...nel.org, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH v5 5/7] selftest/mm: Extract sz2ord function into
 vm_util.h

On 16.08.25 08:15, Andrew Morton wrote:
> On Fri, 15 Aug 2025 14:54:57 +0100 Usama Arif <usamaarif642@...il.com> wrote:
> 
>> The function already has 2 uses and will have a 3rd one
>> in prctl selftests. The pagesize argument is added into
>> the function, as it's not a global variable anymore.
>> No functional change intended with this patch.
>>
> 
> https://lkml.kernel.org/r/20250816040113.760010-5-aboorvad@linux.ibm.com
> jut did this, but didn't add the extra arg.
> tools/testing/selftests/mm/split_huge_page_test.c needed updating.
> 
> --- a/tools/testing/selftests/mm/cow.c~selftest-mm-extract-sz2ord-function-into-vm_utilh
> +++ a/tools/testing/selftests/mm/cow.c
> @@ -52,7 +52,7 @@ static int detect_thp_sizes(size_t sizes
>   	if (!pmdsize)
>   		return 0;
>   
> -	orders = 1UL << sz2ord(pmdsize);
> +	orders = 1UL << sz2ord(pmdsize, pagesize);
>   	orders |= thp_supported_orders();
>   
>   	for (i = 0; orders && count < max; i++) {
> @@ -1211,8 +1211,8 @@ static void run_anon_test_case(struct te
>   		size_t size = thpsizes[i];
>   		struct thp_settings settings = *thp_current_settings();
>   
> -		settings.hugepages[sz2ord(pmdsize)].enabled = THP_NEVER;
> -		settings.hugepages[sz2ord(size)].enabled = THP_ALWAYS;
> +		settings.hugepages[sz2ord(pmdsize, pagesize)].enabled = THP_NEVER;
> +		settings.hugepages[sz2ord(size, pagesize)].enabled = THP_ALWAYS;
>   		thp_push_settings(&settings);
>   
>   		if (size == pmdsize) {
> @@ -1863,7 +1863,7 @@ int main(void)
>   	if (pmdsize) {
>   		/* Only if THP is supported. */
>   		thp_read_settings(&default_settings);
> -		default_settings.hugepages[sz2ord(pmdsize)].enabled = THP_INHERIT;
> +		default_settings.hugepages[sz2ord(pmdsize, pagesize)].enabled = THP_INHERIT;
>   		thp_save_settings();
>   		thp_push_settings(&default_settings);
>   
> --- a/tools/testing/selftests/mm/uffd-wp-mremap.c~selftest-mm-extract-sz2ord-function-into-vm_utilh
> +++ a/tools/testing/selftests/mm/uffd-wp-mremap.c
> @@ -82,9 +82,9 @@ static void *alloc_one_folio(size_t size
>   		struct thp_settings settings = *thp_current_settings();
>   
>   		if (private)
> -			settings.hugepages[sz2ord(size)].enabled = THP_ALWAYS;
> +			settings.hugepages[sz2ord(size, pagesize)].enabled = THP_ALWAYS;
>   		else
> -			settings.shmem_hugepages[sz2ord(size)].enabled = SHMEM_ALWAYS;
> +			settings.shmem_hugepages[sz2ord(size, pagesize)].enabled = SHMEM_ALWAYS;
>   
>   		thp_push_settings(&settings);
>   
> --- a/tools/testing/selftests/mm/vm_util.h~selftest-mm-extract-sz2ord-function-into-vm_utilh
> +++ a/tools/testing/selftests/mm/vm_util.h
> @@ -127,9 +127,9 @@ static inline void log_test_result(int r
>   	ksft_test_result_report(result, "%s\n", test_name);
>   }
>   
> -static inline int sz2ord(size_t size)
> +static inline int sz2ord(size_t size, size_t pagesize)
>   {
> -	return __builtin_ctzll(size / getpagesize());
> +	return __builtin_ctzll(size / pagesize);
>   }
>   
>   void *sys_mremap(void *old_address, unsigned long old_size,
> --- a/tools/testing/selftests/mm/split_huge_page_test.c~selftest-mm-extract-sz2ord-function-into-vm_utilh
> +++ a/tools/testing/selftests/mm/split_huge_page_test.c
> @@ -544,7 +544,7 @@ int main(int argc, char **argv)
>   		ksft_exit_fail_msg("Reading PMD pagesize failed\n");
>   
>   	nr_pages = pmd_pagesize / pagesize;
> -	max_order =  sz2ord(pmd_pagesize);
> +	max_order =  sz2ord(pmd_pagesize, pagesize);
>   	tests = 2 + (max_order - 1) + (2 * max_order) + (max_order - 1) * 4 + 2;
>   	ksft_set_plan(tests);
>   
> _
> 


LGTM.

-- 
Cheers

David / dhildenb