From: Puranjay Mohan puranjay12@gmail.com
[ Upstream commit d6170e4aaf86424c24ce06e355b4573daa891b17 ]
On some architectures like ARM64, PMD_SIZE can be really large in some configurations. Like with CONFIG_ARM64_64K_PAGES=y the PMD_SIZE is 512MB.
Use 2MB * num_possible_nodes() as the size for allocations done through the prog pack allocator. On most architectures, PMD_SIZE will be equal to 2MB in case of 4KB pages and will be greater than 2MB for bigger page sizes.
Fixes: ea2babac63d4 ("bpf: Simplify bpf_prog_pack_[size|mask]") Reported-by: "kernelci.org bot" bot@kernelci.org Closes: https://lore.kernel.org/all/7e216c88-77ee-47b8-becc-a0f780868d3c@sirena.org.... Reported-by: kernel test robot lkp@intel.com Closes: https://lore.kernel.org/oe-kbuild-all/202403092219.dhgcuz2G-lkp@intel.com/ Suggested-by: Song Liu song@kernel.org Signed-off-by: Puranjay Mohan puranjay12@gmail.com Message-ID: 20240311122722.86232-1-puranjay12@gmail.com Signed-off-by: Alexei Starovoitov ast@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/bpf/core.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index 76bf1de261152..44abf88e1bb0d 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -857,7 +857,12 @@ static LIST_HEAD(pack_list); * CONFIG_MMU=n. Use PAGE_SIZE in these cases. */ #ifdef PMD_SIZE -#define BPF_PROG_PACK_SIZE (PMD_SIZE * num_possible_nodes()) +/* PMD_SIZE is really big for some archs. It doesn't make sense to + * reserve too much memory in one allocation. Hardcode BPF_PROG_PACK_SIZE to + * 2MiB * num_possible_nodes(). On most architectures PMD_SIZE will be + * greater than or equal to 2MB. + */ +#define BPF_PROG_PACK_SIZE (SZ_2M * num_possible_nodes()) #else #define BPF_PROG_PACK_SIZE PAGE_SIZE #endif