wordpart.h: Add REPEAT_BYTE_U32()
In some cases it's necessary to replicate a byte across a u32 value, for which REPEAT_BYTE() would be helpful. Currently this requires explicit masking of the result to avoid sparse warnings, as e.g. (u32)REPEAT_BYTE(0xa0)) ... will result in a warning: cast truncates bits from constant value (a0a0a0a0a0a0a0a0 becomes a0a0a0a0) Add a new REPEAT_BYTE_U32() which does the necessary masking internally, so that we don't need to duplicate this for every usage. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Alexandru Elisei <alexandru.elisei@arm.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20240617111841.2529370-2-mark.rutland@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
parent
83a7eefedc
commit
118d777c4c
1 changed files with 8 additions and 0 deletions
|
@ -39,6 +39,14 @@
|
|||
*/
|
||||
#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x))
|
||||
|
||||
/**
|
||||
* REPEAT_BYTE_U32 - repeat the value @x multiple times as a u32 value
|
||||
* @x: value to repeat
|
||||
*
|
||||
* NOTE: @x is not checked for > 0xff; larger values produce odd results.
|
||||
*/
|
||||
#define REPEAT_BYTE_U32(x) lower_32_bits(REPEAT_BYTE(x))
|
||||
|
||||
/* Set bits in the first 'n' bytes when loaded from memory */
|
||||
#ifdef __LITTLE_ENDIAN
|
||||
# define aligned_byte_mask(n) ((1UL << 8*(n))-1)
|
||||
|
|
Loading…
Reference in a new issue