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XArray/IDR update for 6.0

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- Add appropriate might_alloc() annotations to the XArray APIs
 
  - Document that the IDR is deprecated
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Merge tag 'xarray-6.0' of git://git.infradead.org/users/willy/xarray

Pull XArray/IDR updates from Matthew Wilcox:

 - Add appropriate might_alloc() annotations to the XArray APIs

 - Document that the IDR is deprecated

* tag 'xarray-6.0' of git://git.infradead.org/users/willy/xarray:
  IDR: Note that the IDR API is deprecated
  XArray: Add calls to might_alloc()
This commit is contained in:
Linus Torvalds 2022-08-03 10:02:28 -07:00
commit e087437a6f
3 changed files with 20 additions and 0 deletions
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3
Documentation/core-api/idr.rst
View File

@ -17,6 +17,9 @@ solution to the problem to avoid everybody inventing their own. The IDR
provides the ability to map an ID to a pointer, while the IDA provides
only ID allocation, and as a result is much more memory-efficient.
The IDR interface is deprecated; please use the :doc:`XArray <xarray>`
instead.
IDR usage
=========

15
include/linux/xarray.h
View File

@ -16,6 +16,7 @@
#include <linux/kconfig.h>
#include <linux/kernel.h>
#include <linux/rcupdate.h>
#include <linux/sched/mm.h>
#include <linux/spinlock.h>
#include <linux/types.h>
@ -586,6 +587,7 @@ static inline void *xa_store_bh(struct xarray *xa, unsigned long index,
{
void *curr;
might_alloc(gfp);
xa_lock_bh(xa);
curr = __xa_store(xa, index, entry, gfp);
xa_unlock_bh(xa);
@ -612,6 +614,7 @@ static inline void *xa_store_irq(struct xarray *xa, unsigned long index,
{
void *curr;
might_alloc(gfp);
xa_lock_irq(xa);
curr = __xa_store(xa, index, entry, gfp);
xa_unlock_irq(xa);
@ -687,6 +690,7 @@ static inline void *xa_cmpxchg(struct xarray *xa, unsigned long index,
{
void *curr;
might_alloc(gfp);
xa_lock(xa);
curr = __xa_cmpxchg(xa, index, old, entry, gfp);
xa_unlock(xa);
@ -714,6 +718,7 @@ static inline void *xa_cmpxchg_bh(struct xarray *xa, unsigned long index,
{
void *curr;
might_alloc(gfp);
xa_lock_bh(xa);
curr = __xa_cmpxchg(xa, index, old, entry, gfp);
xa_unlock_bh(xa);
@ -741,6 +746,7 @@ static inline void *xa_cmpxchg_irq(struct xarray *xa, unsigned long index,
{
void *curr;
might_alloc(gfp);
xa_lock_irq(xa);
curr = __xa_cmpxchg(xa, index, old, entry, gfp);
xa_unlock_irq(xa);
@ -770,6 +776,7 @@ static inline int __must_check xa_insert(struct xarray *xa,
{
int err;
might_alloc(gfp);
xa_lock(xa);
err = __xa_insert(xa, index, entry, gfp);
xa_unlock(xa);
@ -799,6 +806,7 @@ static inline int __must_check xa_insert_bh(struct xarray *xa,
{
int err;
might_alloc(gfp);
xa_lock_bh(xa);
err = __xa_insert(xa, index, entry, gfp);
xa_unlock_bh(xa);
@ -828,6 +836,7 @@ static inline int __must_check xa_insert_irq(struct xarray *xa,
{
int err;
might_alloc(gfp);
xa_lock_irq(xa);
err = __xa_insert(xa, index, entry, gfp);
xa_unlock_irq(xa);
@ -857,6 +866,7 @@ static inline __must_check int xa_alloc(struct xarray *xa, u32 *id,
{
int err;
might_alloc(gfp);
xa_lock(xa);
err = __xa_alloc(xa, id, entry, limit, gfp);
xa_unlock(xa);
@ -886,6 +896,7 @@ static inline int __must_check xa_alloc_bh(struct xarray *xa, u32 *id,
{
int err;
might_alloc(gfp);
xa_lock_bh(xa);
err = __xa_alloc(xa, id, entry, limit, gfp);
xa_unlock_bh(xa);
@ -915,6 +926,7 @@ static inline int __must_check xa_alloc_irq(struct xarray *xa, u32 *id,
{
int err;
might_alloc(gfp);
xa_lock_irq(xa);
err = __xa_alloc(xa, id, entry, limit, gfp);
xa_unlock_irq(xa);
@ -948,6 +960,7 @@ static inline int xa_alloc_cyclic(struct xarray *xa, u32 *id, void *entry,
{
int err;
might_alloc(gfp);
xa_lock(xa);
err = __xa_alloc_cyclic(xa, id, entry, limit, next, gfp);
xa_unlock(xa);
@ -981,6 +994,7 @@ static inline int xa_alloc_cyclic_bh(struct xarray *xa, u32 *id, void *entry,
{
int err;
might_alloc(gfp);
xa_lock_bh(xa);
err = __xa_alloc_cyclic(xa, id, entry, limit, next, gfp);
xa_unlock_bh(xa);
@ -1014,6 +1028,7 @@ static inline int xa_alloc_cyclic_irq(struct xarray *xa, u32 *id, void *entry,
{
int err;
might_alloc(gfp);
xa_lock_irq(xa);
err = __xa_alloc_cyclic(xa, id, entry, limit, next, gfp);
xa_unlock_irq(xa);

2
tools/include/linux/sched/mm.h
View File

@ -1,4 +1,6 @@
#ifndef _TOOLS_PERF_LINUX_SCHED_MM_H
#define _TOOLS_PERF_LINUX_SCHED_MM_H
#define might_alloc(gfp) do { } while (0)
#endif /* _TOOLS_PERF_LINUX_SCHED_MM_H */