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| author | Linus Torvalds <[email protected]> | 2015-02-20 23:46:31 +0000 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2015-02-21 18:27:33 +0000 |
| commit | dd36929720f40f17685e841ae0d4c581c165ea60 (patch) | |
| tree | 62743edeac21a222371f9032fa1f0e59531c38ce /lib/dynamic_debug.c | |
| parent | Merge tag 'for_linux-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/g... (diff) | |
| download | kernel-dd36929720f40f17685e841ae0d4c581c165ea60.tar.gz kernel-dd36929720f40f17685e841ae0d4c581c165ea60.zip | |
kernel: make READ_ONCE() valid on const arguments
The use of READ_ONCE() causes lots of warnings witht he pending paravirt
spinlock fixes, because those ends up having passing a member to a
'const' structure to READ_ONCE().
There should certainly be nothing wrong with using READ_ONCE() with a
const source, but the helper function __read_once_size() would cause
warnings because it would drop the 'const' qualifier, but also because
the destination would be marked 'const' too due to the use of 'typeof'.
Use a union of types in READ_ONCE() to avoid this issue.
Also make sure to use parenthesis around the macro arguments to avoid
possible operator precedence issues.
Tested-by: Ingo Molnar <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'lib/dynamic_debug.c')
0 files changed, 0 insertions, 0 deletions