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Now that alloc_pages has an entrypoint that allows passing alloc_flags, we can take advantage of this to start removing GFP flags that are only used for mm-internal stuff. This requires also plumbing the alloc_flags into some more of the allocator code, in particular __alloc_pages[_noprof]() gets an alloc_flags arg to go along with its callees, and we now need to pass those flags deeper into the allocator so they can reach the alloc_tag code. While moving the flag definition into page_alloc.h, also update the comment per Hao's suggestion. No functional change intended. Link: https://lore.kernel.org/all/b4916118-3537-4e19-8bc8-1d103dd0d225@linux.dev/ Link: https://lore.kernel.org/20260703-alloc-trylock-v5-15-c87b714e19d3@google.com Signed-off-by: Brendan Jackman <jackmanb@google.com> Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org> Tested-by: Hao Ge <hao.ge@linux.dev> Acked-by: Hao Ge <hao.ge@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>