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tracing: Cleanup upper_empty() in pid_list

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Instead of find_first_bit() use the dedicated bitmap_empty(),
and make upper_empty() a nice one-liner.

While there, fix opencoded BITS_PER_TYPE().

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250429195119.620204-1-yury.norov@gmail.com
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Yury Norov 2025-04-29 15:51:18 -04:00 • committed by Steven Rostedt (Google)
parent 7b382efd5e
commit 45c28cdce7
1 changed files with 2 additions and 6 deletions
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8
kernel/trace/pid_list.c
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@ -81,13 +81,9 @@ static inline bool upper_empty(union upper_chunk *chunk)
{
/*
* If chunk->data has no lower chunks, it will be the same
* as a zeroed bitmask. Use find_first_bit() to test it
* and if it doesn't find any bits set, then the array
* is empty.
* as a zeroed bitmask.
*/
int bit = find_first_bit((unsigned long *)chunk->data,
sizeof(chunk->data) * 8);
return bit >= sizeof(chunk->data) * 8;
return bitmap_empty((unsigned long *)chunk->data, BITS_PER_TYPE(chunk->data));
}
static inline int pid_split(unsigned int pid, unsigned int *upper1,