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Howlett" , Mike Rapoport , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Ying Huang , Alistair Popple , Hao Li , Christoph Lameter , David Rientjes , Roman Gushchin , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt Cc: "Harry Yoo (Oracle)" , Gregory Price , Johannes Weiner , Alexei Starovoitov , Matthew Wilcox , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, Brendan Jackman , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark , Sean Christopherson , Paolo Bonzini , kvm@vger.kernel.org, Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Robin Holt , Steve Wahl , Arnd Bergmann , Greg Kroah-Hartman , Dimitris Michailidis , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Content-Type: text/plain; charset="utf-8" Some tweaks and cleanups for page allocator entrypoint and flags. This is motivated by preparation for __GFP_UNMAPPED [1] (which will probably become ALLOC_UNMAPPED in its next iteration), but all this is supposed to be an improvement to the codebase in its own right: unifying code paths, reducing API surface, and removing GFP flags. [1] https://lore.kernel.org/all/20260320-page_alloc-unmapped-v2-0-28bf1bd54f41@google.com/ This started with unifying __alloc_frozen_pages[_nolock]_noprof() and expanded from there. Unifying the nolock allocator entrypoint with the normal allocator entrypoint means adding an alloc_flags argument to the later (only exposed within mm/). This presents an opportunity to take advantage of that arg to remove some GFP flags, if we add that alloc_flags arg a bit more broadly to allocator entrypoints. To distinguish between mm-internal and "public" allocator entrypoints, it makes sense to use the __ prefix. There are already some public APIs with that prefix. For *alloc_pages*, just removing those variants seems like a nice cleanup anyway, so do that. For get_free_pages, the "__" variant is the _only_ variant and it's very widely used, so it doesn't seem worthwhile to modify that. Therefore, scope this "__" change specifically to the *alloc_pages* API, which means we leave the *folio_alloc* API untouched too, even though that could probably be cleaned up if so desired. Tested: - KVM, mm, and BPF selftests in a QEMU VM - kunit.py on x86_64 - For the ALLOC_NO_CODETAG bits I just booted a VM and read /proc/allocinfo. I confirmed that if I remove ALLOC_NO_CODETAG, the kernel crashes in early boot, so I was at least booting code that depends on this logic. I used Google's internal version of Antigravity (AI coding harness) to do the repetitive bits, those commits are marked with Assisted-by, the rest is manual. Signed-off-by: Brendan Jackman --- Changes in v2: - Fixed up whitespace in nolock unification patch - Introduced ALLOC_DEFAULT to replace literal 0 for alloc_flags - All other patches are new - Link to v1: https://patch.msgid.link/20260617-alloc-trylock-v1-1-83fd7858832e@google.com --- Brendan Jackman (13): mm/page_alloc: rename ALLOC_TRYLOCK -> ALLOC_NOLOCK mm/page_alloc: some renames to clarify alloc_flags scopes mm/page_alloc: unify __alloc_frozen_pages[_nolock]_noprof() mm/page_alloc: relax GFP WARN in nolock allocs perf/x86/intel: Use higher-level allocator KVM: VMX: Use higher-level allocator x86/virt: Use higher-level allocator sgi-xp: Use higher-level allocator net/funeth: Switch to higher-level allocator mm: Remove __alloc_pages_node() alloc_tag: Move to mm/ mm: Move __alloc_pages() to mm/internal.h mm: remove __GFP_NO_CODETAG Documentation/admin-guide/cgroup-v1/cpusets.rst | 2 +- Documentation/admin-guide/mm/transhuge.rst | 2 +- MAINTAINERS | 2 +- arch/x86/events/intel/ds.c | 6 +- arch/x86/kvm/vmx/vmx.c | 2 +- arch/x86/virt/hw.c | 2 +- drivers/misc/sgi-xp/xpc_uv.c | 2 +- drivers/net/ethernet/fungible/funeth/funeth_rx.c | 2 +- include/linux/gfp.h | 28 +-- lib/Makefile | 1 - mm/Makefile | 1 + {lib => mm}/alloc_tag.c | 18 +- mm/compaction.c | 4 +- mm/hugetlb.c | 3 +- mm/internal.h | 20 +- mm/mempolicy.c | 10 +- mm/page_alloc.c | 254 +++++++++++++---------- mm/page_frag_cache.c | 4 +- mm/slub.c | 6 +- 19 files changed, 193 insertions(+), 176 deletions(-) --- base-commit: cbe5256a15fc26f592efb037e528da54b2139ee5 change-id: 20260617-alloc-trylock-14ad37dab337 Best regards, -- Brendan Jackman