en Copyright 2015 Java http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/bpf/libarena/src/common.bpf.c#367e6e4a8173d47b4c57181cdd9dcbfc291755f0 selftests/bpf: libarena: Directly return arena pointers from functionsNow that the __arena annotation includes a BTF type tag, and theverifier can identify arena pointers at BTF loading time, returnarena pointers as their true type instead of casting to u64. Remove thepreprocessor typecast wrappers used to hide this from the caller.Acked-by: Eduard Zingerman <eddyz87@gmail.com>Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>Link: https://lore.kernel.org/r/20260602004120.17087-6-emil@etsalapatis.comSigned-off-by: Alexei Starovoitov <ast@kernel.org> List of files: /linux/tools/testing/selftests/bpf/libarena/src/common.bpf.c Tue, 02 Jun 2026 02:41:19 +0200 Emil Tsalapatis <emil@etsalapatis.com> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/bpf/libarena/src/common.bpf.c#b9b23fe1761117f4a0109a25d16d337c900437ad selftests/bpf: Remove __arg_arena from the codebaseNow that BPF __arg_arena has been subsumed by __arena, remove__arg_arena from the codebase. This way the user has one fewerannotation to worry about.To remove __arg_arena we remove the typedefs we were previouslyusing to minimize __arena annotations. This is because __arenanow also includes a BTF type tag, which is ignored for non-pointertypes. As a result, we cannot capture the whole __arena annotationinside a typedef and need to directly annotate the pointer type whendeclaring the variable.The extra verbosity is worth it because the use of the __arena tagis intuitive to the programmer and removes the __arg_arena tag thathas been a consistent source of confusion for users. The typedefscan be reintroduced later (without __arg_arena) once compilers startsupporting BTF type tags for non-pointer types.Acked-by: Eduard Zingerman <eddyz87@gmail.com>Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>Link: https://lore.kernel.org/r/20260602004120.17087-5-emil@etsalapatis.comSigned-off-by: Alexei Starovoitov <ast@kernel.org> List of files: /linux/tools/testing/selftests/bpf/libarena/src/common.bpf.c Tue, 02 Jun 2026 02:41:18 +0200 Emil Tsalapatis <emil@etsalapatis.com> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/bpf/libarena/src/common.bpf.c#9f5b3ffc3f1dac7204e32eeeff84bc5cc55c393e selftests/bpf: Rename libarena malloc/free methodsThe s390 architecture uses the token "free" for an enum, conflictingwith the malloc/free definitions. Rename the calls to arena_malloc andarena_free instead to prevent collisions.Reported-by: Ihor Solodrai <ihor.solodrai@linux.dev>Signed-off-by: Emil Tsalapatis <etsal@meta.com>Fixes: 86426a28c52d ("selftests/bpf: Add buddy allocator for libarena")Acked-by: Ihor Solodrai <ihor.solodrai@linux.dev>Link: https://lore.kernel.org/r/20260428134252.2783519-1-etsal@meta.comSigned-off-by: Alexei Starovoitov <ast@kernel.org> List of files: /linux/tools/testing/selftests/bpf/libarena/src/common.bpf.c Tue, 28 Apr 2026 15:42:52 +0200 Emil Tsalapatis <emil@etsalapatis.com> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/bpf/libarena/src/common.bpf.c#86426a28c52d756a5edbe29885716128b8915991 selftests/bpf: Add buddy allocator for libarenaAdd a byte-oriented buddy allocator for libarena. The buddyallocator provides an alloc/free interface for small arena allocationsranging from 16 bytes to 512 KiB. Lower allocations values are roundedup to 16 bytes. The buddy allocator does not handle larger allocationsthat can instead use the existing bpf_arena_{alloc, free}_pages() kfunc.Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>Link: https://lore.kernel.org/r/20260426190338.4615-7-emil@etsalapatis.comSigned-off-by: Alexei Starovoitov <ast@kernel.org> List of files: /linux/tools/testing/selftests/bpf/libarena/src/common.bpf.c Sun, 26 Apr 2026 21:03:36 +0200 Emil Tsalapatis <emil@etsalapatis.com> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/bpf/libarena/src/common.bpf.c#cfc00618b9dfc75cd507f1a4f0d83b4429627399 selftests/bpf: Add ASAN support for libarena selftestsExpand the arena library selftest infrastructure to supportaddress sanitization. Add the compiler flags necessary tocompile the library under ASAN when supported.Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>Link: https://lore.kernel.org/r/20260426190338.4615-6-emil@etsalapatis.comSigned-off-by: Alexei Starovoitov <ast@kernel.org> List of files: /linux/tools/testing/selftests/bpf/libarena/src/common.bpf.c Sun, 26 Apr 2026 21:03:35 +0200 Emil Tsalapatis <emil@etsalapatis.com> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/bpf/libarena/src/common.bpf.c#d5327480a12a031f283c85c3c9c9201685099036 selftests/bpf: Add basic libarena scaffoldingAdd initial code and a Makefile for an arena-based BPF library. Modulescan be added just by including the source file in the library's src/subdirectory. Future commits will introduce the library code itself.The code includes workarounds that are removed in subsequent patchesthat ensure bisectability.Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>Link: https://lore.kernel.org/r/20260426190338.4615-3-emil@etsalapatis.comSigned-off-by: Alexei Starovoitov <ast@kernel.org> List of files: /linux/tools/testing/selftests/bpf/libarena/src/common.bpf.c Sun, 26 Apr 2026 21:03:32 +0200 Emil Tsalapatis <emil@etsalapatis.com>