[RFC PATCH bpf-next 3/7] bpf: x86: Rename stack_size to regs_off in {save,restore}_regs()

[Yonghong Song <yhs@fb.com>]

Rename argument 'stack_size' to 'regs_off' in save_regs() and
restore_regs() since in reality 'stack_size' represents a particular
stack offset and 'regs_off' is the one in the caller argument.
Leter, another stack offset will be added to these two functions
for saving and restoring struct argument values.

Signed-off-by: Yonghong Song <yhs@fb.com>
---
 arch/x86/net/bpf_jit_comp.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index c1f6c1c51d99..2657b58001cf 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -1749,7 +1749,7 @@ st:			if (is_imm8(insn->off))
 }
 
 static void save_regs(const struct btf_func_model *m, u8 **prog, int nr_args,
-		      int stack_size)
+		      int regs_off)
 {
 	int i;
 	/* Store function arguments to stack.
@@ -1761,11 +1761,11 @@ static void save_regs(const struct btf_func_model *m, u8 **prog, int nr_args,
 		emit_stx(prog, bytes_to_bpf_size(m->arg_size[i]),
 			 BPF_REG_FP,
 			 i == 5 ? X86_REG_R9 : BPF_REG_1 + i,
-			 -(stack_size - i * 8));
+			 -(regs_off - i * 8));
 }
 
 static void restore_regs(const struct btf_func_model *m, u8 **prog, int nr_args,
-			 int stack_size)
+			 int regs_off)
 {
 	int i;
 
@@ -1778,7 +1778,7 @@ static void restore_regs(const struct btf_func_model *m, u8 **prog, int nr_args,
 		emit_ldx(prog, bytes_to_bpf_size(m->arg_size[i]),
 			 i == 5 ? X86_REG_R9 : BPF_REG_1 + i,
 			 BPF_REG_FP,
-			 -(stack_size - i * 8));
+			 -(regs_off - i * 8));
 }
 
 static int invoke_bpf_prog(const struct btf_func_model *m, u8 **pprog,
-- 
2.30.2