From a4864671ca0bf51c8e78242951741df52c06766f Mon Sep 17 00:00:00 2001 From: Kairui Song Date: Tue, 16 Apr 2024 01:18:55 +0800 Subject: lib/xarray: introduce a new helper xas_get_order It can be used after xas_load to check the order of loaded entries. Compared to xa_get_order, it saves an XA_STATE and avoid a rewalk. Added new test for xas_get_order, to make the test work, we have to export xas_get_order with EXPORT_SYMBOL_GPL. Also fix a sparse warning by checking the slot value with xa_entry instead of accessing it directly, as suggested by Matthew Wilcox. [kasong@tencent.com: simplify comment, sparse warning fix, per Matthew Wilcox] Link: https://lkml.kernel.org/r/20240416071722.45997-4-ryncsn@gmail.com Link: https://lkml.kernel.org/r/20240415171857.19244-4-ryncsn@gmail.com Signed-off-by: Kairui Song Cc: Matthew Wilcox (Oracle) Signed-off-by: Andrew Morton --- include/linux/xarray.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/linux/xarray.h') diff --git a/include/linux/xarray.h b/include/linux/xarray.h index cb571dfcf4b1..d9d479334c9e 100644 --- a/include/linux/xarray.h +++ b/include/linux/xarray.h @@ -1548,6 +1548,7 @@ void xas_create_range(struct xa_state *); #ifdef CONFIG_XARRAY_MULTI int xa_get_order(struct xarray *, unsigned long index); +int xas_get_order(struct xa_state *xas); void xas_split(struct xa_state *, void *entry, unsigned int order); void xas_split_alloc(struct xa_state *, void *entry, unsigned int order, gfp_t); #else @@ -1556,6 +1557,11 @@ static inline int xa_get_order(struct xarray *xa, unsigned long index) return 0; } +static inline int xas_get_order(struct xa_state *xas) +{ + return 0; +} + static inline void xas_split(struct xa_state *xas, void *entry, unsigned int order) { -- cgit v1.2.3-73-gaa49b