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authorMichael Ellerman <mpe@ellerman.id.au>2016-03-24 22:04:01 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2016-04-14 15:47:05 +1000
commit04cf31a759ef575f750a63777cee95500e410994 (patch)
treeee5dbbf8b9ac93c0b0e28a21b59db58cd4b19bcf /kernel/trace
parent8c50b72a3b4f1f7cdfdfebd233b1cbd121262e65 (diff)
downloadblackbird-op-linux-04cf31a759ef575f750a63777cee95500e410994.tar.gz
blackbird-op-linux-04cf31a759ef575f750a63777cee95500e410994.zip
ftrace: Make ftrace_location_range() global
In order to support live patching on powerpc we would like to call ftrace_location_range(), so make it global. Signed-off-by: Torsten Duwe <duwe@suse.de> Signed-off-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/ftrace.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index eca592f977b2..e1b3f2312db0 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1533,7 +1533,19 @@ static int ftrace_cmp_recs(const void *a, const void *b)
return 0;
}
-static unsigned long ftrace_location_range(unsigned long start, unsigned long end)
+/**
+ * ftrace_location_range - return the first address of a traced location
+ * if it touches the given ip range
+ * @start: start of range to search.
+ * @end: end of range to search (inclusive). @end points to the last byte
+ * to check.
+ *
+ * Returns rec->ip if the related ftrace location is a least partly within
+ * the given address range. That is, the first address of the instruction
+ * that is either a NOP or call to the function tracer. It checks the ftrace
+ * internal tables to determine if the address belongs or not.
+ */
+unsigned long ftrace_location_range(unsigned long start, unsigned long end)
{
struct ftrace_page *pg;
struct dyn_ftrace *rec;
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