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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 , Hao Ge , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, derkling@google.com, reijiw@google.com, Brendan Jackman , Yosry Ahmed , JP Kobryn , 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" This is based on mm-new, it depends on moving alloc_tag to mm/ [0]. [0] https://lore.kernel.org/all/aj5QBtJcphPElczI@lucifer/ 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 v4: - Fixed some (harmless) missing applications of ac->alloc_flags (local Sashiko) - Fixed various build issues. - Note that Sashiko pointed out a KMSAN build issue [0], I have fixed it but KMSAN builds are currently broken by objtool [1]. At least mm/kmsan/init.c compiles. [2] https://lore.kernel.org/all/20260629141642.628271F00A3D@smtp.kernel.org/ [3] https://lore.kernel.org/all/20260630104434.GC751831@noisy.programming.kicks-ass.net/t/#u - Avoided setting ALLOC_NOFRAGMENT under ALLOC_NOLOCK (Sashiko, Harry) - Added patch to tweak alloc_flags_cma() interface (Vlastimil) - More commit messages fixups (various) - Added patch to create can_spin_trylock() (Harry) - Link to v3: https://patch.msgid.link/20260629-alloc-trylock-v3-0-57bef0eadbc2@google.com Changes in v3: - Created mm/page_alloc.h - Fixed EXPORT_SYMBOL() issues - Reworded commit messages per Sashiko's pointers - Dropped rename of alloc_flags arg in prepare_alloc_pages() (Suren) - Renamed gfp_to_alloc_flags_nonblocking() too after rebasing onto: https://lore.kernel.org/all/20260623004600.113347-1-jp.kobryn@linux.dev/ - Link to v2: https://patch.msgid.link/20260622-alloc-trylock-v2-0-31f31367d420@google.com 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 (17): mm/page_alloc: rename ALLOC_TRYLOCK -> ALLOC_NOLOCK mm/page_alloc: some renames to clarify alloc_flags scopes mm: name some args in a function declaration mm: Split out internal page_alloc.h mm/page_alloc: unify __alloc_frozen_pages[_nolock]_noprof() mm/page_alloc: relax GFP WARN in nolock allocs mm: move some stuff to mm/page_alloc.h perf/x86/intel: Use higher-level allocator API KVM: VMX: Use higher-level allocator API x86/virt: Use higher-level allocator API sgi-xp: Use higher-level allocator API net/funeth: Switch to higher-level allocator API mm: Remove __alloc_pages_node() mm: Move __alloc_pages() to mm/page_alloc.h mm: replace __GFP_NO_CODETAG with ALLOC_NO_CODETAG mm/page_alloc: drop alloc_flags arg from alloc_flags_cma() mm: factor out can_spin_trylock() Vlastimil Babka (SUSE) (1): mm: remove the __GFP_NO_OBJ_EXT flag Documentation/admin-guide/cgroup-v1/cpusets.rst | 2 +- Documentation/admin-guide/mm/transhuge.rst | 2 +- MAINTAINERS | 1 + 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 | 5 +- drivers/net/ethernet/fungible/funeth/funeth_rx.c | 2 +- include/linux/alloc_tag.h | 4 +- include/linux/gfp.h | 54 +--- include/linux/gfp_types.h | 7 - include/linux/skbuff.h | 2 +- include/trace/events/mmflags.h | 10 +- mm/alloc_tag.c | 23 +- mm/compaction.c | 5 +- mm/hugetlb.c | 4 +- mm/internal.h | 276 ++------------------ mm/khugepaged.c | 1 + mm/kmsan/init.c | 2 +- mm/memory-failure.c | 1 + mm/memory_hotplug.c | 1 + mm/mempolicy.c | 11 +- mm/migrate.c | 1 + mm/mm_init.c | 1 + mm/page_alloc.c | 269 ++++++++++--------- mm/page_alloc.h | 313 +++++++++++++++++++++++ mm/page_frag_cache.c | 6 +- mm/page_isolation.c | 1 + mm/page_owner.c | 2 +- mm/page_reporting.c | 1 + mm/show_mem.c | 1 + mm/shuffle.c | 1 + mm/slub.c | 17 +- mm/swap.c | 1 + mm/vmscan.c | 1 + mm/vmstat.c | 1 + tools/include/linux/gfp_types.h | 7 - 37 files changed, 537 insertions(+), 509 deletions(-) --- base-commit: 581a9d8f214b3f9d8777e66795ca86dbd9ca44a8 change-id: 20260617-alloc-trylock-14ad37dab337 Best regards, -- Brendan Jackman