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treewide: Rename rcu_dereference_raw_notrace() to _check()

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The rcu_dereference_raw_notrace() API name is confusing.  It is equivalent
to rcu_dereference_raw() except that it also does sparse pointer checking.

There are only a few users of rcu_dereference_raw_notrace(). This patches
renames all of them to be rcu_dereference_raw_check() with the "_check()"
indicating sparse checking.

Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
[ paulmck: Fix checkpatch warnings about parentheses. ]
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Joel Fernandes (Google) 2019-07-11 16:45:41 -04:00 committed by Paul E. McKenney
parent 609488bc97
commit 0a5b99f578
6 changed files with 12 additions and 12 deletions
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2
Documentation/RCU/Design/Requirements/Requirements.html
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@ -2512,7 +2512,7 @@ disabled across the entire RCU read-side critical section.
<p>
It is possible to use tracing on RCU code, but tracing itself
uses RCU.
For this reason, <tt>rcu_dereference_raw_notrace()</tt>
For this reason, <tt>rcu_dereference_raw_check()</tt>
is provided for use by tracing, which avoids the destructive
recursion that could otherwise ensue.
This API is also used by virtualization in some architectures,

2
arch/powerpc/include/asm/kvm_book3s_64.h
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@ -535,7 +535,7 @@ static inline void note_hpte_modification(struct kvm *kvm,
*/
static inline struct kvm_memslots *kvm_memslots_raw(struct kvm *kvm)
{
return rcu_dereference_raw_notrace(kvm->memslots[0]);
return rcu_dereference_raw_check(kvm->memslots[0]);
}
extern void kvmppc_mmu_debugfs_init(struct kvm *kvm);

6
include/linux/rculist.h
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@ -622,7 +622,7 @@ static inline void hlist_add_behind_rcu(struct hlist_node *n,
* as long as the traversal is guarded by rcu_read_lock().
*/
#define hlist_for_each_entry_rcu(pos, head, member) \
for (pos = hlist_entry_safe (rcu_dereference_raw(hlist_first_rcu(head)),\
for (pos = hlist_entry_safe(rcu_dereference_raw(hlist_first_rcu(head)),\
typeof(*(pos)), member); \
pos; \
pos = hlist_entry_safe(rcu_dereference_raw(hlist_next_rcu(\
@ -642,10 +642,10 @@ static inline void hlist_add_behind_rcu(struct hlist_node *n,
* not do any RCU debugging or tracing.
*/
#define hlist_for_each_entry_rcu_notrace(pos, head, member) \
for (pos = hlist_entry_safe (rcu_dereference_raw_notrace(hlist_first_rcu(head)),\
for (pos = hlist_entry_safe(rcu_dereference_raw_check(hlist_first_rcu(head)),\
typeof(*(pos)), member); \
pos; \
pos = hlist_entry_safe(rcu_dereference_raw_notrace(hlist_next_rcu(\
pos = hlist_entry_safe(rcu_dereference_raw_check(hlist_next_rcu(\
&(pos)->member)), typeof(*(pos)), member))
/**

2
include/linux/rcupdate.h
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@ -476,7 +476,7 @@ do { \
* The no-tracing version of rcu_dereference_raw() must not call
* rcu_read_lock_held().
*/
#define rcu_dereference_raw_notrace(p) __rcu_dereference_check((p), 1, __rcu)
#define rcu_dereference_raw_check(p) __rcu_dereference_check((p), 1, __rcu)
/**
* rcu_dereference_protected() - fetch RCU pointer when updates prevented

8
kernel/trace/ftrace_internal.h
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@ -6,22 +6,22 @@
/*
* Traverse the ftrace_global_list, invoking all entries. The reason that we
* can use rcu_dereference_raw_notrace() is that elements removed from this list
* can use rcu_dereference_raw_check() is that elements removed from this list
* are simply leaked, so there is no need to interact with a grace-period
* mechanism. The rcu_dereference_raw_notrace() calls are needed to handle
* mechanism. The rcu_dereference_raw_check() calls are needed to handle
* concurrent insertions into the ftrace_global_list.
*
* Silly Alpha and silly pointer-speculation compiler optimizations!
*/
#define do_for_each_ftrace_op(op, list) \
op = rcu_dereference_raw_notrace(list); \
op = rcu_dereference_raw_check(list); \
do
/*
* Optimized for just a single item in the list (as that is the normal case).
*/
#define while_for_each_ftrace_op(op) \
while (likely(op = rcu_dereference_raw_notrace((op)->next)) && \
while (likely(op = rcu_dereference_raw_check((op)->next)) && \
unlikely((op) != &ftrace_list_end))
extern struct ftrace_ops __rcu *ftrace_ops_list;

4
kernel/trace/trace.c
View File

@ -2642,10 +2642,10 @@ static void ftrace_exports(struct ring_buffer_event *event)
preempt_disable_notrace();
export = rcu_dereference_raw_notrace(ftrace_exports_list);
export = rcu_dereference_raw_check(ftrace_exports_list);
while (export) {
trace_process_export(export, event);
export = rcu_dereference_raw_notrace(export->next);
export = rcu_dereference_raw_check(export->next);
}
preempt_enable_notrace();