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authorPaul E. McKenney <paulmck@kernel.org>2021-04-22 00:30:54 +0300
committerPaul E. McKenney <paulmck@kernel.org>2021-05-13 19:13:23 +0300
commit76c8eaafe4f061f3790112842a2fbb297e4bea88 (patch)
tree3f6feabd24c2677e9cafd06406183f7ff11abd41 /security
parent3d3a0d1b508dcc47e82b0e12cde6585bc088b0cc (diff)
downloadlinux-76c8eaafe4f061f3790112842a2fbb297e4bea88.tar.xz
rcu: Create an unrcu_pointer() to remove __rcu from a pointer
The xchg() and cmpxchg() functions are sometimes used to carry out RCU updates. Unfortunately, this can result in sparse warnings for both the old-value and new-value arguments, as well as for the return value. The arguments can be dealt with using RCU_INITIALIZER(): old_p = xchg(&p, RCU_INITIALIZER(new_p)); But a sparse warning still remains due to assigning the __rcu pointer returned from xchg to the (most likely) non-__rcu pointer old_p. This commit therefore provides an unrcu_pointer() macro that strips the __rcu. This macro can be used as follows: old_p = unrcu_pointer(xchg(&p, RCU_INITIALIZER(new_p))); Reported-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'security')
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