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| author | Takashi Iwai <tiwai@suse.de> | 2016-09-30 18:40:40 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2016-09-30 18:40:40 +0200 |
| commit | eeea8b40cd2866ca24f25e5ef09225edb076ae45 (patch) | |
| tree | ece5b5287ee2ce53a841b66d0f526947f74d036f /include/linux/compiler.h | |
| parent | 3383c5c395386ac8e258b1a324c72ce850b84a9e (diff) | |
| parent | 513e43efafe329dad7b5794583b67ac898dcbdca (diff) | |
| download | lwn-eeea8b40cd2866ca24f25e5ef09225edb076ae45.tar.gz lwn-eeea8b40cd2866ca24f25e5ef09225edb076ae45.zip | |
Merge tag 'asoc-v4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-next
ASoC: Updates for v4.9
Apart from the cleanups done by Morimoto-san this has very much been a
driver focused release with very little generic change:
- A big factoring out of the simple-card code to allow it to be shared
more with the rcar generic card from Kuninori Morimoto.
- Removal of some operations duplicated on the CODEC level, again by
Kuninori Morimoto.
- Lots more machine support for x86 systems.
- New drivers for Nuvoton NAU88C10, Realtek RT5660 and RT5663.
Diffstat (limited to 'include/linux/compiler.h')
| -rw-r--r-- | include/linux/compiler.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 436aa4e42221..668569844d37 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -527,13 +527,14 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s * object's lifetime is managed by something other than RCU. That * "something other" might be reference counting or simple immortality. * - * The seemingly unused size_t variable is to validate @p is indeed a pointer - * type by making sure it can be dereferenced. + * The seemingly unused variable ___typecheck_p validates that @p is + * indeed a pointer type by using a pointer to typeof(*p) as the type. + * Taking a pointer to typeof(*p) again is needed in case p is void *. */ #define lockless_dereference(p) \ ({ \ typeof(p) _________p1 = READ_ONCE(p); \ - size_t __maybe_unused __size_of_ptr = sizeof(*(p)); \ + typeof(*(p)) *___typecheck_p __maybe_unused; \ smp_read_barrier_depends(); /* Dependency order vs. p above. */ \ (_________p1); \ }) |