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bitops: Define generic___bitrev8/16/32 for reuse

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Define generic___bitrev8/16/32 using the implementation in
<linux/bitrev.h>, so they can be reused in <asm/bitrev.h>,
such as RISCV.

Reviewed-by: Yury Norov <ynorov@nvidia.com>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Signed-off-by: Yury Norov <ynorov@nvidia.com>
This commit is contained in:
Jinjie Ruan 2026-05-06 13:52:04 -04:00 committed by Yury Norov
parent 00751d655e
commit 83aede8131
2 changed files with 27 additions and 16 deletions
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23
include/asm-generic/bitops/__bitrev.h Normal file
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@ -0,0 +1,23 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_GENERIC_BITOPS___BITREV_H_
#define _ASM_GENERIC_BITOPS___BITREV_H_
#include <asm/types.h>
extern u8 const byte_rev_table[256];
static __always_inline __attribute_const__ u8 generic___bitrev8(u8 byte)
{
return byte_rev_table[byte];
}
static __always_inline __attribute_const__ u16 generic___bitrev16(u16 x)
{
return (generic___bitrev8(x & 0xff) << 8) | generic___bitrev8(x >> 8);
}
static __always_inline __attribute_const__ u32 generic___bitrev32(u32 x)
{
return (generic___bitrev16(x & 0xffff) << 16) | generic___bitrev16(x >> 16);
}
#endif /* _ASM_GENERIC_BITOPS___BITREV_H_ */

20
include/linux/bitrev.h
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@ -12,22 +12,10 @@
#define __bitrev8 __arch_bitrev8
#else
extern u8 const byte_rev_table[256];
static inline u8 __bitrev8(u8 byte)
{
return byte_rev_table[byte];
}
static inline u16 __bitrev16(u16 x)
{
return (__bitrev8(x & 0xff) << 8) | __bitrev8(x >> 8);
}
static inline u32 __bitrev32(u32 x)
{
return (__bitrev16(x & 0xffff) << 16) | __bitrev16(x >> 16);
}
#include <asm-generic/bitops/__bitrev.h>
#define __bitrev32 generic___bitrev32
#define __bitrev16 generic___bitrev16
#define __bitrev8 generic___bitrev8
#endif /* CONFIG_HAVE_ARCH_BITREVERSE */
#define __bitrev8x4(x) (__bitrev32(swab32(x)))