include/uapi/linux/byteorder, swab: force inlining of some byteswap operations

Sometimes gcc mysteriously doesn't inline very small functions we expect to be inlined. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66122 With this .config: http://busybox.net/~vda/kernel_config_OPTIMIZE_INLINING_and_Os, the following functions get deinlined many times. Examples of disassembly: <get_unaligned_be16> (12 copies, 51 calls): 66 8b 07 mov (%rdi),%ax 55 push %rbp 48 89 e5 mov %rsp,%rbp 86 e0 xchg %ah,%al 5d pop %rbp c3 retq <get_unaligned_be32> (12 copies, 135 calls): 8b 07 mov (%rdi),%eax 55 push %rbp 48 89 e5 mov %rsp,%rbp 0f c8 bswap %eax 5d pop %rbp c3 retq <get_unaligned_be64> (2 copies, 20 calls): 48 8b 07 mov (%rdi),%rax 55 push %rbp 48 89 e5 mov %rsp,%rbp 48 0f c8 bswap %rax 5d pop %rbp c3 retq <__swab16p> (16 copies, 146 calls): 55 push %rbp 89 f8 mov %edi,%eax 86 e0 xchg %ah,%al 48 89 e5 mov %rsp,%rbp 5d pop %rbp c3 retq <__swab32p> (43 copies, ~560 calls): 55 push %rbp 89 f8 mov %edi,%eax 0f c8 bswap %eax 48 89 e5 mov %rsp,%rbp 5d pop %rbp c3 retq <__swab64p> (21 copies, 119 calls): 55 push %rbp 48 89 f8 mov %rdi,%rax 48 0f c8 bswap %rax 48 89 e5 mov %rsp,%rbp 5d pop %rbp c3 retq <__swab32s> (6 copies, 47 calls): 8b 07 mov (%rdi),%eax 55 push %rbp 48 89 e5 mov %rsp,%rbp 0f c8 bswap %eax 89 07 mov %eax,(%rdi) 5d pop %rbp c3 retq This patch fixes this via s/inline/__always_inline/. Code size decrease after the patch is ~4.5k: text data bss dec hex filename 92202377 20826112 36417536 149446025 8e85d89 vmlinux 92197848 20826112 36417536 149441496 8e84bd8 vmlinux5_swap_after Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> Acked-by: Ingo Molnar <mingo@kernel.org> Cc: Thomas Graf <tgraf@suug.ch> Cc: Peter Zijlstra <peterz@infradead.org> Cc: David Rientjes <rientjes@google.com> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-03-17 14:22:44 -07:00 · 2016-03-17 14:22:44 -07:00 · bc27fb68aa
commit bc27fb68aa
parent a644fdf029
3 changed files with 29 additions and 29 deletions
--- a/include/uapi/linux/byteorder/big_endian.h
+++ b/include/uapi/linux/byteorder/big_endian.h
@ -40,51 +40,51 @@
 #define __cpu_to_be16(x) ((__force __be16)(__u16)(x))
 #define __be16_to_cpu(x) ((__force __u16)(__be16)(x))

-static inline __le64 __cpu_to_le64p(const __u64 *p)
+static __always_inline __le64 __cpu_to_le64p(const __u64 *p)
 {
 	return (__force __le64)__swab64p(p);
 }
-static inline __u64 __le64_to_cpup(const __le64 *p)
+static __always_inline __u64 __le64_to_cpup(const __le64 *p)
 {
 	return __swab64p((__u64 *)p);
 }
-static inline __le32 __cpu_to_le32p(const __u32 *p)
+static __always_inline __le32 __cpu_to_le32p(const __u32 *p)
 {
 	return (__force __le32)__swab32p(p);
 }
-static inline __u32 __le32_to_cpup(const __le32 *p)
+static __always_inline __u32 __le32_to_cpup(const __le32 *p)
 {
 	return __swab32p((__u32 *)p);
 }
-static inline __le16 __cpu_to_le16p(const __u16 *p)
+static __always_inline __le16 __cpu_to_le16p(const __u16 *p)
 {
 	return (__force __le16)__swab16p(p);
 }
-static inline __u16 __le16_to_cpup(const __le16 *p)
+static __always_inline __u16 __le16_to_cpup(const __le16 *p)
 {
 	return __swab16p((__u16 *)p);
 }
-static inline __be64 __cpu_to_be64p(const __u64 *p)
+static __always_inline __be64 __cpu_to_be64p(const __u64 *p)
 {
 	return (__force __be64)*p;
 }
-static inline __u64 __be64_to_cpup(const __be64 *p)
+static __always_inline __u64 __be64_to_cpup(const __be64 *p)
 {
 	return (__force __u64)*p;
 }
-static inline __be32 __cpu_to_be32p(const __u32 *p)
+static __always_inline __be32 __cpu_to_be32p(const __u32 *p)
 {
 	return (__force __be32)*p;
 }
-static inline __u32 __be32_to_cpup(const __be32 *p)
+static __always_inline __u32 __be32_to_cpup(const __be32 *p)
 {
 	return (__force __u32)*p;
 }
-static inline __be16 __cpu_to_be16p(const __u16 *p)
+static __always_inline __be16 __cpu_to_be16p(const __u16 *p)
 {
 	return (__force __be16)*p;
 }
-static inline __u16 __be16_to_cpup(const __be16 *p)
+static __always_inline __u16 __be16_to_cpup(const __be16 *p)
 {
 	return (__force __u16)*p;
 }
--- a/include/uapi/linux/byteorder/little_endian.h
+++ b/include/uapi/linux/byteorder/little_endian.h
@ -40,51 +40,51 @@
 #define __cpu_to_be16(x) ((__force __be16)__swab16((x)))
 #define __be16_to_cpu(x) __swab16((__force __u16)(__be16)(x))

-static inline __le64 __cpu_to_le64p(const __u64 *p)
+static __always_inline __le64 __cpu_to_le64p(const __u64 *p)
 {
 	return (__force __le64)*p;
 }
-static inline __u64 __le64_to_cpup(const __le64 *p)
+static __always_inline __u64 __le64_to_cpup(const __le64 *p)
 {
 	return (__force __u64)*p;
 }
-static inline __le32 __cpu_to_le32p(const __u32 *p)
+static __always_inline __le32 __cpu_to_le32p(const __u32 *p)
 {
 	return (__force __le32)*p;
 }
-static inline __u32 __le32_to_cpup(const __le32 *p)
+static __always_inline __u32 __le32_to_cpup(const __le32 *p)
 {
 	return (__force __u32)*p;
 }
-static inline __le16 __cpu_to_le16p(const __u16 *p)
+static __always_inline __le16 __cpu_to_le16p(const __u16 *p)
 {
 	return (__force __le16)*p;
 }
-static inline __u16 __le16_to_cpup(const __le16 *p)
+static __always_inline __u16 __le16_to_cpup(const __le16 *p)
 {
 	return (__force __u16)*p;
 }
-static inline __be64 __cpu_to_be64p(const __u64 *p)
+static __always_inline __be64 __cpu_to_be64p(const __u64 *p)
 {
 	return (__force __be64)__swab64p(p);
 }
-static inline __u64 __be64_to_cpup(const __be64 *p)
+static __always_inline __u64 __be64_to_cpup(const __be64 *p)
 {
 	return __swab64p((__u64 *)p);
 }
-static inline __be32 __cpu_to_be32p(const __u32 *p)
+static __always_inline __be32 __cpu_to_be32p(const __u32 *p)
 {
 	return (__force __be32)__swab32p(p);
 }
-static inline __u32 __be32_to_cpup(const __be32 *p)
+static __always_inline __u32 __be32_to_cpup(const __be32 *p)
 {
 	return __swab32p((__u32 *)p);
 }
-static inline __be16 __cpu_to_be16p(const __u16 *p)
+static __always_inline __be16 __cpu_to_be16p(const __u16 *p)
 {
 	return (__force __be16)__swab16p(p);
 }
-static inline __u16 __be16_to_cpup(const __be16 *p)
+static __always_inline __u16 __be16_to_cpup(const __be16 *p)
 {
 	return __swab16p((__u16 *)p);
 }
--- a/include/uapi/linux/swab.h
+++ b/include/uapi/linux/swab.h
@ -151,7 +151,7 @@ static inline __attribute_const__ __u32 __fswahb32(__u32 val)
 * __swab16p - return a byteswapped 16-bit value from a pointer
 * @p: pointer to a naturally-aligned 16-bit value
 */
-static inline __u16 __swab16p(const __u16 *p)
+static __always_inline __u16 __swab16p(const __u16 *p)
 {
 #ifdef __arch_swab16p
 	return __arch_swab16p(p);
@ -164,7 +164,7 @@ static inline __u16 __swab16p(const __u16 *p)
 * __swab32p - return a byteswapped 32-bit value from a pointer
 * @p: pointer to a naturally-aligned 32-bit value
 */
-static inline __u32 __swab32p(const __u32 *p)
+static __always_inline __u32 __swab32p(const __u32 *p)
 {
 #ifdef __arch_swab32p
 	return __arch_swab32p(p);
@ -177,7 +177,7 @@ static inline __u32 __swab32p(const __u32 *p)
 * __swab64p - return a byteswapped 64-bit value from a pointer
 * @p: pointer to a naturally-aligned 64-bit value
 */
-static inline __u64 __swab64p(const __u64 *p)
+static __always_inline __u64 __swab64p(const __u64 *p)
 {
 #ifdef __arch_swab64p
 	return __arch_swab64p(p);
@ -232,7 +232,7 @@ static inline void __swab16s(__u16 *p)
 * __swab32s - byteswap a 32-bit value in-place
 * @p: pointer to a naturally-aligned 32-bit value
 */
-static inline void __swab32s(__u32 *p)
+static __always_inline void __swab32s(__u32 *p)
 {
 #ifdef __arch_swab32s
 	__arch_swab32s(p);
@ -245,7 +245,7 @@ static inline void __swab32s(__u32 *p)
 * __swab64s - byteswap a 64-bit value in-place
 * @p: pointer to a naturally-aligned 64-bit value
 */
-static inline void __swab64s(__u64 *p)
+static __always_inline void __swab64s(__u64 *p)
 {
 #ifdef __arch_swab64s
 	__arch_swab64s(p);