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include/linux/err.h: add a function to cast error-pointers to a return value
authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Tue, 22 Mar 2011 23:34:05 +0000 (16:34 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 23 Mar 2011 00:44:11 +0000 (17:44 -0700)
PTR_RET() can be used if you have an error-pointer and are only interested
in the eventual error value, but not the pointer.  Yields the usual 0 for
no error, -ESOMETHING otherwise.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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