[PATCH] x86: net: bpf_jit_comp32: Remove unused 'cnt' variables from most functions

From: kunyu
Date: Wed Jun 12 2024 - 04:59:19 EST

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In these functions, the 'cnt' variable is not used or does not require
value checking, so these 'cnt' variables can be removed.

Signed-off-by: kunyu <kunyu@xxxxxxxxxxxx>
---
arch/x86/net/bpf_jit_comp32.c | 27 ++-------------------------
1 file changed, 2 insertions(+), 25 deletions(-)

diff --git a/arch/x86/net/bpf_jit_comp32.c b/arch/x86/net/bpf_jit_comp32.c
index de0f9e5f9f73..30f9b8a3faed 100644
--- a/arch/x86/net/bpf_jit_comp32.c
+++ b/arch/x86/net/bpf_jit_comp32.c
@@ -207,7 +207,6 @@ static inline void emit_ia32_mov_i(const u8 dst, const u32 val, bool dstk,
u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;

if (dstk) {
if (val == 0) {
@@ -235,7 +234,6 @@ static inline void emit_ia32_mov_r(const u8 dst, const u8 src, bool dstk,
bool sstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 sreg = sstk ? IA32_EAX : src;

if (sstk)
@@ -286,7 +284,6 @@ static inline void emit_ia32_mul_r(const u8 dst, const u8 src, bool dstk,
bool sstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 sreg = sstk ? IA32_ECX : src;

if (sstk)
@@ -319,7 +316,6 @@ static inline void emit_ia32_to_le_r64(const u8 dst[], s32 val,
const struct bpf_prog_aux *aux)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 dreg_lo = dstk ? IA32_EAX : dst_lo;
u8 dreg_hi = dstk ? IA32_EDX : dst_hi;

@@ -367,7 +363,6 @@ static inline void emit_ia32_to_be_r64(const u8 dst[], s32 val,
const struct bpf_prog_aux *aux)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 dreg_lo = dstk ? IA32_EAX : dst_lo;
u8 dreg_hi = dstk ? IA32_EDX : dst_hi;

@@ -436,7 +431,6 @@ static inline void emit_ia32_div_mod_r(const u8 op, const u8 dst, const u8 src,
bool dstk, bool sstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;

if (sstk)
/* mov ecx,dword ptr [ebp+off] */
@@ -483,7 +477,6 @@ static inline void emit_ia32_shift_r(const u8 op, const u8 dst, const u8 src,
bool dstk, bool sstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 dreg = dstk ? IA32_EAX : dst;
u8 b2;

@@ -525,7 +518,6 @@ static inline void emit_ia32_alu_r(const bool is64, const bool hi, const u8 op,
bool sstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 sreg = sstk ? IA32_EAX : src;
u8 dreg = dstk ? IA32_EDX : dst;

@@ -599,7 +591,6 @@ static inline void emit_ia32_alu_i(const bool is64, const bool hi, const u8 op,
u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 dreg = dstk ? IA32_EAX : dst;
u8 sreg = IA32_EDX;

@@ -698,7 +689,6 @@ static inline void emit_ia32_alu_i64(const bool is64, const u8 op,
static inline void emit_ia32_neg64(const u8 dst[], bool dstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 dreg_lo = dstk ? IA32_EAX : dst_lo;
u8 dreg_hi = dstk ? IA32_EDX : dst_hi;

@@ -732,7 +722,6 @@ static inline void emit_ia32_lsh_r64(const u8 dst[], const u8 src[],
bool dstk, bool sstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 dreg_lo = dstk ? IA32_EAX : dst_lo;
u8 dreg_hi = dstk ? IA32_EDX : dst_hi;

@@ -785,7 +774,6 @@ static inline void emit_ia32_arsh_r64(const u8 dst[], const u8 src[],
bool dstk, bool sstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 dreg_lo = dstk ? IA32_EAX : dst_lo;
u8 dreg_hi = dstk ? IA32_EDX : dst_hi;

@@ -838,7 +826,6 @@ static inline void emit_ia32_rsh_r64(const u8 dst[], const u8 src[], bool dstk,
bool sstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 dreg_lo = dstk ? IA32_EAX : dst_lo;
u8 dreg_hi = dstk ? IA32_EDX : dst_hi;

@@ -891,7 +878,6 @@ static inline void emit_ia32_lsh_i64(const u8 dst[], const u32 val,
bool dstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 dreg_lo = dstk ? IA32_EAX : dst_lo;
u8 dreg_hi = dstk ? IA32_EDX : dst_hi;

@@ -939,7 +925,6 @@ static inline void emit_ia32_rsh_i64(const u8 dst[], const u32 val,
bool dstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 dreg_lo = dstk ? IA32_EAX : dst_lo;
u8 dreg_hi = dstk ? IA32_EDX : dst_hi;

@@ -988,7 +973,6 @@ static inline void emit_ia32_arsh_i64(const u8 dst[], const u32 val,
bool dstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;
u8 dreg_lo = dstk ? IA32_EAX : dst_lo;
u8 dreg_hi = dstk ? IA32_EDX : dst_hi;

@@ -1036,7 +1020,6 @@ static inline void emit_ia32_mul_r64(const u8 dst[], const u8 src[], bool dstk,
bool sstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;

if (dstk)
/* mov eax,dword ptr [ebp+off] */
@@ -1113,7 +1096,6 @@ static inline void emit_ia32_mul_i64(const u8 dst[], const u32 val,
bool dstk, u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;
u32 hi;

hi = val & (1<<31) ? (u32)~0 : 0;
@@ -1200,7 +1182,6 @@ struct jit_context {
static void emit_prologue(u8 **pprog, u32 stack_depth)
{
u8 *prog = *pprog;
- int cnt = 0;
const u8 *r1 = bpf2ia32[BPF_REG_1];
const u8 fplo = bpf2ia32[BPF_REG_FP][0];
const u8 fphi = bpf2ia32[BPF_REG_FP][1];
@@ -1237,7 +1218,6 @@ static void emit_prologue(u8 **pprog, u32 stack_depth)
EMIT3(0x89, add_2reg(0x40, IA32_EBP, IA32_EBX), STACK_VAR(tcc[0]));
EMIT3(0x89, add_2reg(0x40, IA32_EBP, IA32_EBX), STACK_VAR(tcc[1]));

- BUILD_BUG_ON(cnt != PROLOGUE_SIZE);
*pprog = prog;
}

@@ -1246,7 +1226,6 @@ static void emit_epilogue(u8 **pprog, u32 stack_depth)
{
u8 *prog = *pprog;
const u8 *r0 = bpf2ia32[BPF_REG_0];
- int cnt = 0;

/* mov eax,dword ptr [ebp+off]*/
EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EAX), STACK_VAR(r0[0]));
@@ -1391,7 +1370,6 @@ static void emit_bpf_tail_call(u8 **pprog, u8 *ip)
static inline void emit_push_r64(const u8 src[], u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;

/* mov ecx,dword ptr [ebp+off] */
EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_ECX), STACK_VAR(src_hi));
@@ -1409,7 +1387,6 @@ static inline void emit_push_r64(const u8 src[], u8 **pprog)
static void emit_push_r32(const u8 src[], u8 **pprog)
{
u8 *prog = *pprog;
- int cnt = 0;

/* mov ecx,dword ptr [ebp+off] */
EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_ECX), STACK_VAR(src_lo));
@@ -1570,7 +1547,7 @@ static int emit_kfunc_call(const struct bpf_prog *bpf_prog, u8 *end_addr,
const struct bpf_insn *insn, u8 **pprog)
{
const u8 arg_regs[] = { IA32_EAX, IA32_EDX, IA32_ECX };
- int i, cnt = 0, first_stack_regno, last_stack_regno;
+ int i, first_stack_regno, last_stack_regno;
int free_arg_regs = ARRAY_SIZE(arg_regs);
const struct btf_func_model *fm;
int bytes_in_stack = 0;
@@ -1663,7 +1640,7 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
int insn_cnt = bpf_prog->len;
bool seen_exit = false;
u8 temp[BPF_MAX_INSN_SIZE + BPF_INSN_SAFETY];
- int i, cnt = 0;
+ int i;
int proglen = 0;
u8 *prog = temp;

--
2.18.2

Next message: Hannes Reinecke: "Re: [PATCH v7 03/11] filemap: allocate mapping_min_order folios in the page cache"
Previous message: Daniel Vetter: "Re: [PATCH] drm/panel: Avoid warnings w/ panel-simple/panel-edp at shutdown"
Next in thread: Alexei Starovoitov: "Re: [PATCH] x86: net: bpf_jit_comp32: Remove unused 'cnt' variables from most functions"
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