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[bpf-next,v11,3/7] bpf, x86: Avoid repeated usage of bpf_prog->aux->stack_depth

Message ID 20241109025327.149832-1-yonghong.song@linux.dev (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf: Support private stack for bpf progs | expand

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netdev/cc_maintainers warning 16 maintainers not CCed: mingo@redhat.com x86@kernel.org hpa@zytor.com eddyz87@gmail.com bp@alien8.de dsahern@kernel.org netdev@vger.kernel.org john.fastabend@gmail.com haoluo@google.com dave.hansen@linux.intel.com kpsingh@kernel.org martin.lau@linux.dev tglx@linutronix.de sdf@fomichev.me song@kernel.org jolsa@kernel.org
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Commit Message

Yonghong Song Nov. 9, 2024, 2:53 a.m. UTC 
Refactor the code to avoid repeated usage of bpf_prog->aux->stack_depth
in do_jit() func. If the private stack is used, the stack_depth will be
0 for that prog. Refactoring make it easy to adjust stack_depth.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
---
 arch/x86/net/bpf_jit_comp.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 06b080b61aa5..3ff638c37999 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -1425,14 +1425,17 @@  static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image, u8 *rw_image
 	int i, excnt = 0;
 	int ilen, proglen = 0;
 	u8 *prog = temp;
+	u32 stack_depth;
 	int err;
 
+	stack_depth = bpf_prog->aux->stack_depth;
+
 	arena_vm_start = bpf_arena_get_kern_vm_start(bpf_prog->aux->arena);
 	user_vm_start = bpf_arena_get_user_vm_start(bpf_prog->aux->arena);
 
 	detect_reg_usage(insn, insn_cnt, callee_regs_used);
 
-	emit_prologue(&prog, bpf_prog->aux->stack_depth,
+	emit_prologue(&prog, stack_depth,
 		      bpf_prog_was_classic(bpf_prog), tail_call_reachable,
 		      bpf_is_subprog(bpf_prog), bpf_prog->aux->exception_cb);
 	/* Exception callback will clobber callee regs for its own use, and
@@ -2128,7 +2131,7 @@  st:			if (is_imm8(insn->off))
 
 			func = (u8 *) __bpf_call_base + imm32;
 			if (tail_call_reachable) {
-				LOAD_TAIL_CALL_CNT_PTR(bpf_prog->aux->stack_depth);
+				LOAD_TAIL_CALL_CNT_PTR(stack_depth);
 				ip += 7;
 			}
 			if (!imm32)
@@ -2145,13 +2148,13 @@  st:			if (is_imm8(insn->off))
 							  &bpf_prog->aux->poke_tab[imm32 - 1],
 							  &prog, image + addrs[i - 1],
 							  callee_regs_used,
-							  bpf_prog->aux->stack_depth,
+							  stack_depth,
 							  ctx);
 			else
 				emit_bpf_tail_call_indirect(bpf_prog,
 							    &prog,
 							    callee_regs_used,
-							    bpf_prog->aux->stack_depth,
+							    stack_depth,
 							    image + addrs[i - 1],
 							    ctx);
 			break;