GitHub-Mirror/linux-bl808
2
0
Fork 0
mirror of https://github.com/Fishwaldo/linux-bl808.git synced 2025-06-17 20:25:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

XArray: Add xa_cmpxchg_irq and xa_cmpxchg_bh

Browse source 
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>
This commit is contained in:
Matthew Wilcox 2018-11-26 16:08:43 -05:00
parent eff3860bbf
commit 55f3f7eab7
3 changed files with 59 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

5
Documentation/core-api/xarray.rst
View file

@ -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