Re: [PATCH -next v1 3/3] kernel/events/uprobes: uprobe_write_opcode() rewrite

[David Hildenbrand]

On 05.03.25 20:30, Matthew Wilcox wrote:
> On Tue, Mar 04, 2025 at 04:48:46PM +0100, David Hildenbrand wrote:
> > +static bool orig_page_is_identical(struct vm_area_struct *vma,
> > +		unsigned long vaddr, struct page *page, bool *pmd_mappable)
> > +{
> > +	const pgoff_t index = vaddr_to_offset(vma, vaddr) >> PAGE_SHIFT;
> > +	struct page *orig_page = find_get_page(vma->vm_file->f_inode->i_mapping,
> > +					       index);
> > +	struct folio *orig_folio;
> > +	bool identical;
> > +
> > +	if (!orig_page)
> > +		return false;
> > +	orig_folio = page_folio(orig_page);
>
> I'd rather write this as:
>
> 	struct folio *orig_folio = filemap_get_folio(vma->vm_file->f_mapping,
> 			index);
> 	struct page *orig_page;
>
> 	if (IS_ERR(orig_folio))
> 		return false;
> 	orig_page = folio_file_page(folio, index);

Willy, you read my mind. I was staring at that code and thought "there 
must be an easier way using pages", and folio_file_page() was the 
missing piece.

Thanks!

--
Cheers,

David / dhildenb