netdev - [PATCH bpf-next 2/4] riscv, bpf: Using kvcalloc to allocate cache buffer

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Message-Id: <20230919035711.3297256-3-pulehui@huaweicloud.com>
Date: Tue, 19 Sep 2023 11:57:09 +0800
From: Pu Lehui <pulehui@...weicloud.com>
To: bpf@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	netdev@...r.kernel.org
Cc: Björn Töpel <bjorn@...nel.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...gle.com>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Conor Dooley <conor@...nel.org>,
	Luke Nelson <luke.r.nels@...il.com>,
	Pu Lehui <pulehui@...wei.com>,
	Pu Lehui <pulehui@...weicloud.com>
Subject: [PATCH bpf-next 2/4] riscv, bpf: Using kvcalloc to allocate cache buffer

From: Pu Lehui <pulehui@...wei.com>

It is unnecessary to allocate continuous physical memory for cache
buffer, and when ebpf program is too large, it may cause memory
allocation failure.

Signed-off-by: Pu Lehui <pulehui@...wei.com>
---
 arch/riscv/net/bpf_jit_comp64.c | 4 ++--
 arch/riscv/net/bpf_jit_core.c   | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index 8423f4ddf..57535cfe1 100644
--- a/arch/riscv/net/bpf_jit_comp64.c
+++ b/arch/riscv/net/bpf_jit_comp64.c
@@ -906,7 +906,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 	}
 
 	if (fmod_ret->nr_links) {
-		branches_off = kcalloc(fmod_ret->nr_links, sizeof(int), GFP_KERNEL);
+		branches_off = kvcalloc(fmod_ret->nr_links, sizeof(int), GFP_KERNEL);
 		if (!branches_off)
 			return -ENOMEM;
 
@@ -993,7 +993,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 
 	ret = ctx->ninsns;
 out:
-	kfree(branches_off);
+	kvfree(branches_off);
 	return ret;
 }
 
diff --git a/arch/riscv/net/bpf_jit_core.c b/arch/riscv/net/bpf_jit_core.c
index dd00103a2..d9c82537d 100644
--- a/arch/riscv/net/bpf_jit_core.c
+++ b/arch/riscv/net/bpf_jit_core.c
@@ -78,7 +78,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
 	}
 
 	ctx->prog = prog;
-	ctx->offset = kcalloc(prog->len, sizeof(int), GFP_KERNEL);
+	ctx->offset = kvcalloc(prog->len, sizeof(int), GFP_KERNEL);
 	if (!ctx->offset) {
 		prog = orig_prog;
 		goto out_offset;
@@ -170,7 +170,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
 			ctx->offset[i] = ninsns_rvoff(ctx->offset[i]);
 		bpf_prog_fill_jited_linfo(prog, ctx->offset);
 out_offset:
-		kfree(ctx->offset);
+		kvfree(ctx->offset);
 		kfree(jit_data);
 		prog->aux->jit_data = NULL;
 	}
-- 
2.25.1