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memcg: slub: fix SUnreclaim for post charged objects
Large kmalloc directly allocates from the page allocator and then use lruvec_stat_mod_folio() to increment the unreclaimable slab stats for global and memcg. However when post memcg charging of slab objects was added in commit 9028cde ("memcg: add charging of already allocated slab objects"), it missed to correctly handle the unreclaimable slab stats for memcg. One user visisble effect of that bug is that the node level unreclaimable slab stat will work correctly but the memcg level stat can underflow as kernel correctly handles the free path but the charge path missed to increment the memcg level unreclaimable slab stat. Let's fix by correctly handle in the post charge code path. Fixes: 9028cde ("memcg: add charging of already allocated slab objects") Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev> Cc: <stable@vger.kernel.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
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