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author | Boqun Feng <boqun.feng@gmail.com> | 2015-12-29 07:18:46 +0300 |
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committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-02-24 06:59:53 +0300 |
commit | ad315455d396a1cbcb2f9fdd687b7e1b26b789e7 (patch) | |
tree | ec1d39c7dda0349ac5a29cbcb5c02a43532dd61d /kernel/rcu | |
parent | 1914aab54319ed70608078df4f18ac4767753977 (diff) | |
download | linux-ad315455d396a1cbcb2f9fdd687b7e1b26b789e7.tar.xz |
sparse: Add __private to privatize members of structs
In C programming language, we don't have a easy way to privatize a
member of a structure. However in kernel, sometimes there is a need to
privatize a member in case of potential bugs or misuses.
Fortunately, the noderef attribute of sparse is a way to privatize a
member, as by defining a member as noderef, the address-of operator on
the member will produce a noderef pointer to that member, and if anyone
wants to dereference that kind of pointers to read or modify the member,
sparse will yell.
Based on this, __private modifier and related operation ACCESS_PRIVATE()
are introduced, which could help detect undesigned public uses of
private members of structs. Here is an example of sparse's output if it
detect an undersigned public use:
| kernel/rcu/tree.c:4453:25: warning: incorrect type in argument 1 (different modifiers)
| kernel/rcu/tree.c:4453:25: expected struct raw_spinlock [usertype] *lock
| kernel/rcu/tree.c:4453:25: got struct raw_spinlock [noderef] *<noident>
Also, this patch improves compiler.h a little bit by adding comments for
"#else" and "#endif".
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
0 files changed, 0 insertions, 0 deletions