locking/atomics: Update comment about READ_ONCE() and structures

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The comment is out of data. Also point out the performance drawback
of the barrier();__builtin_memcpy(); barrier() followed by another
copy from stack (__u) to lvalue;

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1453757600-11441-1-git-send-email-konrad.wilk@oracle.com
[ Made it a bit more readable. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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Konrad Rzeszutek Wilk 2016-01-25 16:33:20 -05:00 • committed by Ingo Molnar

parent 06bea3dbfe

commit fed0764faf

1 changed files with 3 additions and 2 deletions

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include/linux/compiler.h

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