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Vineet Gupta e188f3330a ARC: cmpxchg/xchg: rewrite as macros to make type safe
Existing code forces/assume args to type "long" which won't work in LP64
regime, so prepare code for that

Interestingly this should be a non functional change but I do see
some codegen changes

| bloat-o-meter vmlinux-cmpxchg-A vmlinux-cmpxchg-B
| add/remove: 0/0 grow/shrink: 17/12 up/down: 218/-150 (68)
|
| Function                                     old     new   delta
| rwsem_optimistic_spin                        518     550     +32
| rwsem_down_write_slowpath                   1244    1274     +30
| __do_sys_perf_event_open                    2576    2600     +24
| down_read                                    192     200      +8
| __down_read                                  192     200      +8
...
| task_work_run                                168     148     -20
| dma_fence_chain_walk.part                    760     736     -24
| __genradix_ptr_alloc                         674     646     -28

Total: Before=6187409, After=6187477, chg +0.00%

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
History 2021-08-24 14:25:47 -07:00
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Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.