tools/testing/selftests/bpf/libarena/src/common.bpf.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/libarena/src/common.bpf.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/libarena/src/common.bpf.c
Extension
.c
Size
945 bytes
Lines
53
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: LGPL-2.1 OR BSD-2-Clause
/* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */
#include <libarena/common.h>
#include <libarena/asan.h>
#include <libarena/buddy.h>

const volatile u32 zero = 0;

struct buddy __arena buddy;

int arena_fls(__u64 word)
{
	if (!word)
		return 0;

	return 64 - __builtin_clzll(word);
}

SEC("syscall")
__weak int arena_get_info(struct arena_get_info_args *args)
{
	args->arena_base = arena_base(&arena);

	return 0;
}

SEC("syscall")
__weak int arena_alloc_reserve(struct arena_alloc_reserve_args *args)
{
	return bpf_arena_reserve_pages(&arena, NULL, args->nr_pages);
}

SEC("syscall")
__weak int arena_buddy_reset(void)
{
	buddy_destroy(&buddy);

	return buddy_init(&buddy);
}

__weak void __arena *arena_malloc(size_t size)
{
	return buddy_alloc(&buddy, size);
}

__weak void arena_free(void __arena *ptr)
{
	buddy_free(&buddy, ptr);
}


char _license[] SEC("license") = "GPL";

Annotation

Implementation Notes