mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2024-11-21 19:46:16 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

bitops: Change function return types from long to int

Browse Source 
Change the return types of bitops functions (ffs, fls, and fns) from
long to int. The expected return values are in the range [0, 64], for
which int is sufficient.

Additionally, int aligns well with the return types of the corresponding
__builtin_* functions, potentially reducing overall type conversions.

Many of the existing bitops functions already return an int and don't
need to be changed. The bitops functions in arch/ should be considered
separately.

Adjust some return variables to match the function return types.

With GCC 13 and defconfig, these changes reduced the size of a test
kernel image by 5,432 bytes on arm64 and by 248 bytes on riscv; there
were no changes in size on x86_64, powerpc, or m68k.

Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Thorsten Blum 2024-04-21 00:38:37 +02:00 committed by Arnd Bergmann
parent e67572cd22
commit 9c313ccdfc
No known key found for this signature in database
GPG Key ID: 60AB47FFC9095227
8 changed files with 14 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/asm-generic/bitops/__ffs.h
View File

@ -10,9 +10,9 @@
*
* Undefined if no bit exists, so code should check against 0 first.
*/
static __always_inline unsigned long generic___ffs(unsigned long word)
static __always_inline unsigned int generic___ffs(unsigned long word)
{
int num = 0;
unsigned int num = 0;
#if BITS_PER_LONG == 64
if ((word & 0xffffffff) == 0) {

4
include/asm-generic/bitops/__fls.h
View File

@ -10,9 +10,9 @@
*
* Undefined if no set bit exists, so code should check against 0 first.
*/
static __always_inline unsigned long generic___fls(unsigned long word)
static __always_inline unsigned int generic___fls(unsigned long word)
{
int num = BITS_PER_LONG - 1;
unsigned int num = BITS_PER_LONG - 1;
#if BITS_PER_LONG == 64
if (!(word & (~0ul << 32))) {

2
include/asm-generic/bitops/builtin-__ffs.h
View File

@ -8,7 +8,7 @@
*
* Undefined if no bit exists, so code should check against 0 first.
*/
static __always_inline unsigned long __ffs(unsigned long word)
static __always_inline unsigned int __ffs(unsigned long word)
{
return __builtin_ctzl(word);
}

2
include/asm-generic/bitops/builtin-__fls.h
View File

@ -8,7 +8,7 @@
*
* Undefined if no set bit exists, so code should check against 0 first.
*/
static __always_inline unsigned long __fls(unsigned long word)
static __always_inline unsigned int __fls(unsigned long word)
{
return (sizeof(word) * 8) - 1 - __builtin_clzl(word);
}

6
include/linux/bitops.h
View File

@ -200,7 +200,7 @@ static __always_inline __s64 sign_extend64(__u64 value, int index)
return (__s64)(value << shift) >> shift;
}
static inline unsigned fls_long(unsigned long l)
static inline unsigned int fls_long(unsigned long l)
{
if (sizeof(l) == 4)
return fls(l);
@ -236,7 +236,7 @@ static inline int get_count_order_long(unsigned long l)
* The result is not defined if no bits are set, so check that @word
* is non-zero before calling this.
*/
static inline unsigned long __ffs64(u64 word)
static inline unsigned int __ffs64(u64 word)
{
#if BITS_PER_LONG == 32
if (((u32)word) == 0UL)
@ -252,7 +252,7 @@ static inline unsigned long __ffs64(u64 word)
* @word: The word to search
* @n: Bit to find
*/
static inline unsigned long fns(unsigned long word, unsigned int n)
static inline unsigned int fns(unsigned long word, unsigned int n)
{
unsigned int bit;

4
tools/include/asm-generic/bitops/__ffs.h
View File

@ -11,9 +11,9 @@
*
* Undefined if no bit exists, so code should check against 0 first.
*/
static __always_inline unsigned long __ffs(unsigned long word)
static __always_inline unsigned int __ffs(unsigned long word)
{
int num = 0;
unsigned int num = 0;
#if __BITS_PER_LONG == 64
if ((word & 0xffffffff) == 0) {

4
tools/include/asm-generic/bitops/__fls.h
View File

@ -10,9 +10,9 @@
*
* Undefined if no set bit exists, so code should check against 0 first.
*/
static __always_inline unsigned long generic___fls(unsigned long word)
static __always_inline unsigned int generic___fls(unsigned long word)
{
int num = BITS_PER_LONG - 1;
unsigned int num = BITS_PER_LONG - 1;
#if BITS_PER_LONG == 64
if (!(word & (~0ul << 32))) {

2
tools/include/linux/bitops.h
View File

@ -70,7 +70,7 @@ static inline unsigned long hweight_long(unsigned long w)
return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
}
static inline unsigned fls_long(unsigned long l)
static inline unsigned int fls_long(unsigned long l)
{
if (sizeof(l) == 4)
return fls(l);