netdev - [Patch bpf-next] bpf: remove unused parameter from ___bpf_prog

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Date:   Wed, 31 Mar 2021 07:51:35 +0000
From:   He Fengqing <hefengqing@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
        <netdev@...r.kernel.org>
CC:     <kpsingh@...nel.org>, <john.fastabend@...il.com>, <yhs@...com>,
        <songliubraving@...com>, <kafai@...com>, <andrii@...nel.org>,
        <daniel@...earbox.net>, <ast@...nel.org>
Subject: [Patch bpf-next] bpf: remove unused parameter from ___bpf_prog_run

'stack' parameter is not used in ___bpf_prog_run,
the base address have been set to FP reg. So consequently remove it.

Signed-off-by: He Fengqing <hefengqing@...wei.com>
---
 kernel/bpf/core.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index f5423251c118..5e31ee9f7512 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -1363,11 +1363,10 @@ u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
  *	__bpf_prog_run - run eBPF program on a given context
  *	@regs: is the array of MAX_BPF_EXT_REG eBPF pseudo-registers
  *	@insn: is the array of eBPF instructions
- *	@stack: is the eBPF storage stack
  *
  * Decode and execute eBPF instructions.
  */
-static u64 ___bpf_prog_run(u64 *regs, const struct bpf_insn *insn, u64 *stack)
+static u64 ___bpf_prog_run(u64 *regs, const struct bpf_insn *insn)
 {
 #define BPF_INSN_2_LBL(x, y)    [BPF_##x | BPF_##y] = &&x##_##y
 #define BPF_INSN_3_LBL(x, y, z) [BPF_##x | BPF_##y | BPF_##z] = &&x##_##y##_##z
@@ -1701,7 +1700,7 @@ static unsigned int PROG_NAME(stack_size)(const void *ctx, const struct bpf_insn
 \
 	FP = (u64) (unsigned long) &stack[ARRAY_SIZE(stack)]; \
 	ARG1 = (u64) (unsigned long) ctx; \
-	return ___bpf_prog_run(regs, insn, stack); \
+	return ___bpf_prog_run(regs, insn); \
 }
 
 #define PROG_NAME_ARGS(stack_size) __bpf_prog_run_args##stack_size
@@ -1718,7 +1717,7 @@ static u64 PROG_NAME_ARGS(stack_size)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5, \
 	BPF_R3 = r3; \
 	BPF_R4 = r4; \
 	BPF_R5 = r5; \
-	return ___bpf_prog_run(regs, insn, stack); \
+	return ___bpf_prog_run(regs, insn); \
 }
 
 #define EVAL1(FN, X) FN(X)
-- 
2.25.1