proc/task_mmu: remove special-casing of smap_gather_stats() start parameter

smap_gather_stats() interprets its start parameter to mean vma->vm_start
when it's set to 0.  Eliminate this special interpretation and provide two
separate functions for a partial and complete VMA walk.

Since smap_gather_stats() operates within a single VMA, we can replace
walk_page_vma()/walk_page_range() calls with walk_page_range_vma() which
is simpler and also can be called while holding per-VMA lock.

No functional change intended.

Link: https://lore.kernel.org/20260918153318.758387-5-surenb@google.com
Suggested-by: Lorenzo Stoakes <ljs@kernel.org>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Liam R. Howlett (Oracle) <liam@infradead.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Usama Arif <usama.arif@linux.dev>
Cc: Vlastimil Babka <vbabka@kernel.org>

0 files changed, 0 insertions, 0 deletions