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| author | Matthew Wilcox <willy@infradead.org> | 2018-11-26 22:08:43 +0100 |
|---|---|---|
| committer | Matthew Wilcox <willy@infradead.org> | 2018-12-06 14:26:17 +0100 |
| commit | 55f3f7eab75c10d9b33d122670b5935ab64db50f (patch) | |
| tree | 6a601ac3c08993730dfade808fe6806e1bfbf98c /Documentation/core-api | |
| parent | radix tree: Don't return retry entries from lookup (diff) | |
| download | linux-55f3f7eab75c10d9b33d122670b5935ab64db50f.tar.xz linux-55f3f7eab75c10d9b33d122670b5935ab64db50f.zip | |
XArray: Add xa_cmpxchg_irq and xa_cmpxchg_bh
These convenience wrappers match the other _irq and _bh wrappers we
already have. It turns out I'd already open-coded xa_cmpxchg_irq()
in the shmem code, so convert that.
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'Documentation/core-api')
| -rw-r--r-- | Documentation/core-api/xarray.rst | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/core-api/xarray.rst b/Documentation/core-api/xarray.rst index dbe96cb5558e..6a6d67acaf69 100644 --- a/Documentation/core-api/xarray.rst +++ b/Documentation/core-api/xarray.rst @@ -187,6 +187,8 @@ Takes xa_lock internally: * :c:func:`xa_erase_bh` * :c:func:`xa_erase_irq` * :c:func:`xa_cmpxchg` + * :c:func:`xa_cmpxchg_bh` + * :c:func:`xa_cmpxchg_irq` * :c:func:`xa_store_range` * :c:func:`xa_alloc` * :c:func:`xa_alloc_bh` @@ -263,7 +265,8 @@ using :c:func:`xa_lock_irqsave` in both the interrupt handler and process context, or :c:func:`xa_lock_irq` in process context and :c:func:`xa_lock` in the interrupt handler. Some of the more common patterns have helper functions such as :c:func:`xa_store_bh`, :c:func:`xa_store_irq`, -:c:func:`xa_erase_bh` and :c:func:`xa_erase_irq`. +:c:func:`xa_erase_bh`, :c:func:`xa_erase_irq`, :c:func:`xa_cmpxchg_bh` +and :c:func:`xa_cmpxchg_irq`. Sometimes you need to protect access to the XArray with a mutex because that lock sits above another mutex in the locking hierarchy. That does |