From cdc66553c4130735f0a2db943a5259e54ff1597a Mon Sep 17 00:00:00 2001 From: Dawei Li Date: Tue, 16 Apr 2024 16:54:48 +0800 Subject: cpumask: Introduce cpumask_first_and_and() Introduce cpumask_first_and_and() to get intersection between 3 cpumasks, free of any intermediate cpumask variable. Instead, cpumask_first_and_and() works in-place with all inputs and produces desired output directly. Signed-off-by: Dawei Li Signed-off-by: Thomas Gleixner Acked-by: Yury Norov Link: https://lore.kernel.org/r/20240416085454.3547175-2-dawei.li@shingroup.cn --- lib/find_bit.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'lib/find_bit.c') diff --git a/lib/find_bit.c b/lib/find_bit.c index 32f99e9a670e..dacadd904250 100644 --- a/lib/find_bit.c +++ b/lib/find_bit.c @@ -116,6 +116,18 @@ unsigned long _find_first_and_bit(const unsigned long *addr1, EXPORT_SYMBOL(_find_first_and_bit); #endif +/* + * Find the first set bit in three memory regions. + */ +unsigned long _find_first_and_and_bit(const unsigned long *addr1, + const unsigned long *addr2, + const unsigned long *addr3, + unsigned long size) +{ + return FIND_FIRST_BIT(addr1[idx] & addr2[idx] & addr3[idx], /* nop */, size); +} +EXPORT_SYMBOL(_find_first_and_and_bit); + #ifndef find_first_zero_bit /* * Find the first cleared bit in a memory region. -- cgit