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b=X8XKFMuwjEr4wId3sNSvzIMlmB6jWIHHlCuAdoSuTyQ7faKiaUWIVv9wkDoKCvn2l i+p/yJC3VT96PiU4F1h7mS9Yrrj05R3SgmfwqK4h28RW+5boMfKiFf0HV8q7KJML4+ 4cFjQcBw9Iqrbp2WdNGYNDi6TyzspRrUvroNGH6jodxa99h1O5JouDL2VZB6mJaT6y 7AhmoezrI2Ss07m+XtqFePlNk+tXJXgqRceRdUW+NStFczPoN/FzKJv1/hvskf5mIs N1gSiWUbsG2JdifBzUcnX2lGtFuAXkzrv+7uGTDTgpoIsugAocGreRP1Pfoj2aJG6c Q2DlK/UjH9hIg== From: Tejun Heo To: David Vernet , Andrea Righi , Changwoo Min , Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Martin KaFai Lau , Kumar Kartikeya Dwivedi Cc: Peter Zijlstra , Catalin Marinas , Will Deacon , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Andrew Morton , David Hildenbrand , Mike Rapoport , Emil Tsalapatis , sched-ext@lists.linux.dev, bpf@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Tejun Heo Subject: [PATCH 3/8] bpf: Add sleepable variant of bpf_arena_alloc_pages for kernel callers Date: Fri, 22 May 2026 07:22:14 -1000 Message-ID: <20260522172219.1423324-4-tj@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260522172219.1423324-1-tj@kernel.org> References: <20260522172219.1423324-1-tj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 916C2C0007 X-Stat-Signature: m9tkrotftwf3nszi8fejxykrwsq1ashx X-Rspamd-Server: rspam06 X-HE-Tag: 1779470544-332812 X-HE-Meta: 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 qrN6RMbn qcBPD8kx5C965iOVkcaQiHhRAHe2NTDn/sL+RPMNGWpEifLHbjVKyDQ12yYqkSitk7uFn3YwkZGTYkW00xaGW9APOr11lhPv4fZZUm01PxlbACg9IEam5WQAyb7C44oCOf/dAglv66DiSI8Cw0TZAwSTGY49zgaqUJDgNrtlgGDMxDQ+wXCVdZUL35V2yJ58/vq0rUrlCzZwUUFg54E5m7yP4bncoA98QNrhBGzhTpmWsld2iP4Z/wiB+L6MYWd6evxJ7A3hQ6NXzJcslhSbdNBAYYZtR1Uh94f4OJCFztSwjMkwZ33xcTYhGhzfMZSPGrhG8Nbjw7HdWq1NAHCwd8Jv7GeU17xUsRIYRtnzMFLKCUUlz0LKMEaKj/A== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The existing kernel-side export of bpf_arena_alloc_pages is _non_sleepable only - it's used by the verifier to inline the kfunc when the call site is non-sleepable. There is no sleepable equivalent for kernel callers. The kfunc bpf_arena_alloc_pages itself is BPF-only. sched_ext needs sleepable kernel-side allocs for its arena pool init/grow paths. Add bpf_arena_alloc_pages_sleepable() mirroring the _non_sleepable wrapper but passing sleepable=true to arena_alloc_pages(). Signed-off-by: Tejun Heo Reviewed-by: Emil Tsalapatis --- include/linux/bpf.h | 8 ++++++++ kernel/bpf/arena.c | 13 +++++++++++++ 2 files changed, 21 insertions(+) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 831996c411cf..64968ca6db51 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -679,6 +679,8 @@ int bpf_dynptr_from_file_sleepable(struct file *file, u32 flags, void *bpf_arena_alloc_pages_non_sleepable(void *p__map, void *addr__ign, u32 page_cnt, int node_id, u64 flags); void bpf_arena_free_pages_non_sleepable(void *p__map, void *ptr__ign, u32 page_cnt); +void *bpf_arena_alloc_pages_sleepable(void *p__map, void *addr__ign, u32 page_cnt, int node_id, + u64 flags); #else static inline void *bpf_arena_alloc_pages_non_sleepable(void *p__map, void *addr__ign, u32 page_cnt, int node_id, u64 flags) @@ -689,6 +691,12 @@ static inline void *bpf_arena_alloc_pages_non_sleepable(void *p__map, void *addr static inline void bpf_arena_free_pages_non_sleepable(void *p__map, void *ptr__ign, u32 page_cnt) { } + +static inline void *bpf_arena_alloc_pages_sleepable(void *p__map, void *addr__ign, u32 page_cnt, + int node_id, u64 flags) +{ + return NULL; +} #endif extern const struct bpf_map_ops bpf_map_offload_ops; diff --git a/kernel/bpf/arena.c b/kernel/bpf/arena.c index 1c0b87ecc817..a811cf6170fa 100644 --- a/kernel/bpf/arena.c +++ b/kernel/bpf/arena.c @@ -934,6 +934,19 @@ void *bpf_arena_alloc_pages_non_sleepable(void *p__map, void *addr__ign, u32 pag return (void *)arena_alloc_pages(arena, (long)addr__ign, page_cnt, node_id, false); } + +void *bpf_arena_alloc_pages_sleepable(void *p__map, void *addr__ign, u32 page_cnt, + int node_id, u64 flags) +{ + struct bpf_map *map = p__map; + struct bpf_arena *arena = container_of(map, struct bpf_arena, map); + + if (map->map_type != BPF_MAP_TYPE_ARENA || flags || !page_cnt) + return NULL; + + return (void *)arena_alloc_pages(arena, (long)addr__ign, page_cnt, node_id, true); +} + __bpf_kfunc void bpf_arena_free_pages(void *p__map, void *ptr__ign, u32 page_cnt) { struct bpf_map *map = p__map; -- 2.54.0