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scatterlist: inline sg_next()

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sg_next() is a short function called frequently in I/O paths. Define it
in the header file so it can be inlined into its callers.

Link: https://lkml.kernel.org/r/20250416160615.3571958-1-csander@purestorage.com
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Cc: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Caleb Sander Mateos 2025-04-16 10:06:13 -06:00 • committed by Andrew Morton
parent 7d9b05277a
commit 8d1d4b538b
2 changed files with 22 additions and 24 deletions
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23
include/linux/scatterlist.h
View file

@ -94,6 +94,28 @@ static inline bool sg_is_last(struct scatterlist *sg)
return __sg_flags(sg) & SG_END;
}
/**
* sg_next - return the next scatterlist entry in a list
* @sg: The current sg entry
*
* Description:
* Usually the next entry will be @sg@ + 1, but if this sg element is part
* of a chained scatterlist, it could jump to the start of a new
* scatterlist array.
*
**/
static inline struct scatterlist *sg_next(struct scatterlist *sg)
{
if (sg_is_last(sg))
return NULL;
sg++;
if (unlikely(sg_is_chain(sg)))
sg = sg_chain_ptr(sg);
return sg;
}
/**
* sg_assign_page - Assign a given page to an SG entry
* @sg: SG entry
@ -418,7 +440,6 @@ static inline void sg_init_marker(struct scatterlist *sgl,
int sg_nents(struct scatterlist *sg);
int sg_nents_for_len(struct scatterlist *sg, u64 len);
struct scatterlist *sg_next(struct scatterlist *);
struct scatterlist *sg_last(struct scatterlist *s, unsigned int);
void sg_init_table(struct scatterlist *, unsigned int);
void sg_init_one(struct scatterlist *, const void *, unsigned int);

23
lib/scatterlist.c
View file

@ -13,29 +13,6 @@
#include <linux/uio.h>
#include <linux/folio_queue.h>
/**
* sg_next - return the next scatterlist entry in a list
* @sg: The current sg entry
*
* Description:
* Usually the next entry will be @sg@ + 1, but if this sg element is part
* of a chained scatterlist, it could jump to the start of a new
* scatterlist array.
*
**/
struct scatterlist *sg_next(struct scatterlist *sg)
{
if (sg_is_last(sg))
return NULL;
sg++;
if (unlikely(sg_is_chain(sg)))
sg = sg_chain_ptr(sg);
return sg;
}
EXPORT_SYMBOL(sg_next);
/**
* sg_nents - return total count of entries in scatterlist
* @sg: The scatterlist