Re: [PATCH v6 1/2] mm: Abstract THP allocation

[David Hildenbrand <david@redhat.com>]

On 30.09.24 07:28, Dev Jain wrote:
> In preparation for the second patch, abstract away the THP allocation
> logic present in the create_huge_pmd() path, which corresponds to the
> faulting case when no page is present.
> 
> There should be no functional change as a result of applying this patch,
> except that, as David notes at [1], a PMD-aligned address should
> be passed to update_mmu_cache_pmd().
> 
> [1]: https://lore.kernel.org/all/ddd3fcd2-48b3-4170-bcaa-2fe66e093f43@redhat.com/
> 
> Acked-by: David Hildenbrand <david@redhat.com>
> Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
> Signed-off-by: Dev Jain <dev.jain@arm.com>
> ---
>   mm/huge_memory.c | 98 ++++++++++++++++++++++++++++--------------------
>   1 file changed, 57 insertions(+), 41 deletions(-)
> 
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 4e34b7f89daf..e3bcdbc9baa2 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -1148,47 +1148,81 @@ unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
>   }
>   EXPORT_SYMBOL_GPL(thp_get_unmapped_area);
>   
> -static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
> -			struct page *page, gfp_t gfp)
> +static struct folio *vma_alloc_anon_folio_pmd(struct vm_area_struct *vma,
> +					      unsigned long addr)

Just a nit as I am skimming over this once more:

We try to make any new code / code we touch to use a 2-tab
indentation for the second parameter line.

E.g.,

static struct folio *vma_alloc_anon_folio_pmd(struct vm_area_struct *vma,
		unsigned long addr)
{


-- 
Cheers,

David / dhildenb