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As raised by Andrew [1], a folio/compound page never spans a negative number of pages. Consequently, let's use "unsigned long" instead of "long" consistently for folio_nr_pages(), folio_large_nr_pages() and compound_nr(). Using "unsigned long" as return value is fine, because even "(long)-folio_nr_pages()" will keep on working as expected. Using "unsigned int" instead would actually break these use cases. This patch takes the first step changing these to return unsigned long (and making drm_gem_get_pages() use the new types instead of replacing min()). In the future, we might want to make more callers of these functions to consistently use "unsigned long". Link: https://lore.kernel.org/linux-mm/20250503182858.5a02729fcffd6d4723afcfc2@linux-foundation.org/ Link: https://lkml.kernel.org/r/20250826153721.GA23292@cathedrallabs.org Link: https://lore.kernel.org/linux-mm/20250503182858.5a02729fcffd6d4723afcfc2@linux-foundation.org/ [1] Signed-off-by: Aristeu Rozanski <aris@ruivo.org> Suggested-by: Andrew Morton <akpm@linux-foundation.org> Suggested-by: David Hildenbrand <david@redhat.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: David Airlie <airlied@gmail.com> Cc: Simona Vetter <simona@ffwll.ch> Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>