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fs/pipe: express 'pipe_empty()' in terms of 'pipe_occupancy()'

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That's what 'pipe_full()' does, so it's more consistent. But more
importantly it gets the type limits right when the pipe head and tail
are no longer necessarily 'unsigned int'.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2025-03-06 07:30:42 -10:00
parent 848e076317
commit 74d42bdb3a
1 changed files with 10 additions and 10 deletions
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20
include/linux/pipe_fs_i.h
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@ -176,16 +176,6 @@ static inline bool pipe_has_watch_queue(const struct pipe_inode_info *pipe)
#endif
}
/**
* pipe_empty - Return true if the pipe is empty
* @head: The pipe ring head pointer
* @tail: The pipe ring tail pointer
*/
static inline bool pipe_empty(unsigned int head, unsigned int tail)
{
return head == tail;
}
/**
* pipe_occupancy - Return number of slots used in the pipe
* @head: The pipe ring head pointer
@ -196,6 +186,16 @@ static inline unsigned int pipe_occupancy(unsigned int head, unsigned int tail)
return (pipe_index_t)(head - tail);
}
/**
* pipe_empty - Return true if the pipe is empty
* @head: The pipe ring head pointer
* @tail: The pipe ring tail pointer
*/
static inline bool pipe_empty(unsigned int head, unsigned int tail)
{
return !pipe_occupancy(head, tail);
}
/**
* pipe_full - Return true if the pipe is full
* @head: The pipe ring head pointer