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authorLinus Torvalds <torvalds@linux-foundation.org>2015-02-20 15:46:31 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-21 10:27:33 -0800
commitdd36929720f40f17685e841ae0d4c581c165ea60 (patch)
tree62743edeac21a222371f9032fa1f0e59531c38ce /kernel
parent4fbd0a81a0059f22d06780de96e73f9ddbccd8a4 (diff)
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 <mingo@kernel.org> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions