linux-kernel - [PATCH] x86: bpf_jit_comp: Remove inline from static function definitions

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Message-ID: <1417741284.2721.26.camel@perches.com>
Date:	Thu, 04 Dec 2014 17:01:24 -0800
From:	Joe Perches <joe@...ches.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Quentin Lambert <lambert.quentin@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: bpf_jit_comp: Remove inline from static function
 definitions

Let the compiler decide instead.

No change in object size x86-64 -O2 no profiling

Signed-off-by: Joe Perches <joe@...ches.com>
Suggested-by: Eric Dumazet <eric.dumazet@...il.com>
---
On Thu, 2014-12-04 at 16:46 -0800, Eric Dumazet wrote:
> On Thu, 2014-12-04 at 15:31 -0800, Alexei Starovoitov wrote:
> 
> > well, it is a trivial function even from compiler point of view.
> > Dropping inline keyword doesn't help. gcc still inlines them.
> > Changing all 3 functions to _noinline_ doesn't help either.
> > So I think this patch is actually quite helpful to reduce code size.
> 
> Well, again this might depend on CONFIG_CC_OPTIMIZE_FOR_SIZE

-Os has a different size delta, but it's still
smaller using this new function.

> I guess people trying to get very small kernels are using this option.
> 
> My point was : If we care about code size, we should also remove these
> inline keywords at the same time, to increase SNR of netdev/lkml lists.

Because there's no object change here, inline removals
would probably be a good thing for this file.

 arch/x86/net/bpf_jit_comp.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 09e2cea..626e013 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -24,7 +24,7 @@ extern u8 sk_load_byte_positive_offset[];
 extern u8 sk_load_word_negative_offset[], sk_load_half_negative_offset[];
 extern u8 sk_load_byte_negative_offset[];
 
-static inline u8 *emit_code(u8 *ptr, u32 bytes, unsigned int len)
+static u8 *emit_code(u8 *ptr, u32 bytes, unsigned int len)
 {
 	if (len == 1)
 		*ptr = bytes;
@@ -52,12 +52,12 @@ static inline u8 *emit_code(u8 *ptr, u32 bytes, unsigned int len)
 #define EMIT4_off32(b1, b2, b3, b4, off) \
 	do {EMIT4(b1, b2, b3, b4); EMIT(off, 4); } while (0)
 
-static inline bool is_imm8(int value)
+static bool is_imm8(int value)
 {
 	return value <= 127 && value >= -128;
 }
 
-static inline bool is_simm32(s64 value)
+static bool is_simm32(s64 value)
 {
 	return value == (s64) (s32) value;
 }
@@ -94,7 +94,7 @@ static int bpf_size_to_x86_bytes(int bpf_size)
 #define X86_JGE 0x7D
 #define X86_JG  0x7F
 
-static inline void bpf_flush_icache(void *start, void *end)
+static void bpf_flush_icache(void *start, void *end)
 {
 	mm_segment_t old_fs = get_fs();
 
@@ -133,7 +133,7 @@ static const int reg2hex[] = {
  * which need extra byte of encoding.
  * rax,rcx,...,rbp have simpler encoding
  */
-static inline bool is_ereg(u32 reg)
+static bool is_ereg(u32 reg)
 {
 	return (1 << reg) & (BIT(BPF_REG_5) |
 			     BIT(AUX_REG) |
@@ -143,14 +143,14 @@ static inline bool is_ereg(u32 reg)
 }
 
 /* add modifiers if 'reg' maps to x64 registers r8..r15 */
-static inline u8 add_1mod(u8 byte, u32 reg)
+static u8 add_1mod(u8 byte, u32 reg)
 {
 	if (is_ereg(reg))
 		byte |= 1;
 	return byte;
 }
 
-static inline u8 add_2mod(u8 byte, u32 r1, u32 r2)
+static u8 add_2mod(u8 byte, u32 r1, u32 r2)
 {
 	if (is_ereg(r1))
 		byte |= 1;
@@ -160,13 +160,13 @@ static inline u8 add_2mod(u8 byte, u32 r1, u32 r2)
 }
 
 /* encode 'dst_reg' register into x64 opcode 'byte' */
-static inline u8 add_1reg(u8 byte, u32 dst_reg)
+static u8 add_1reg(u8 byte, u32 dst_reg)
 {
 	return byte + reg2hex[dst_reg];
 }
 
 /* encode 'dst_reg' and 'src_reg' registers into x64 opcode 'byte' */
-static inline u8 add_2reg(u8 byte, u32 dst_reg, u32 src_reg)
+static u8 add_2reg(u8 byte, u32 dst_reg, u32 src_reg)
 {
 	return byte + reg2hex[dst_reg] + (reg2hex[src_reg] << 3);
 }


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