path: root/kernel/rcu/tree.c
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authorBoqun Feng <>2015-12-29 12:18:46 +0800
committerPaul E. McKenney <>2016-02-23 19:59:53 -0800
commitad315455d396a1cbcb2f9fdd687b7e1b26b789e7 (patch)
treeec1d39c7dda0349ac5a29cbcb5c02a43532dd61d /kernel/rcu/tree.c
parent1914aab54319ed70608078df4f18ac4767753977 (diff)
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 <> Signed-off-by: Paul E. McKenney <>
Diffstat (limited to 'kernel/rcu/tree.c')
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