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author | Paul E. McKenney <paulmck@kernel.org> | 2021-04-22 00:30:54 +0300 |
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committer | Paul E. McKenney <paulmck@kernel.org> | 2021-05-13 19:13:23 +0300 |
commit | 76c8eaafe4f061f3790112842a2fbb297e4bea88 (patch) | |
tree | 3f6feabd24c2677e9cafd06406183f7ff11abd41 /security | |
parent | 3d3a0d1b508dcc47e82b0e12cde6585bc088b0cc (diff) | |
download | linux-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')
0 files changed, 0 insertions, 0 deletions