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ftrace: Make ftrace_location_range() global

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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>
This commit is contained in:
Michael Ellerman 2016-03-24 22:04:01 +11:00
parent 8c50b72a3b
commit 04cf31a759
2 changed files with 14 additions and 1 deletions
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1
include/linux/ftrace.h
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@ -455,6 +455,7 @@ int ftrace_update_record(struct dyn_ftrace *rec, int enable);
int ftrace_test_record(struct dyn_ftrace *rec, int enable);
void ftrace_run_stop_machine(int command);
unsigned long ftrace_location(unsigned long ip);
unsigned long ftrace_location_range(unsigned long start, unsigned long end);
unsigned long ftrace_get_addr_new(struct dyn_ftrace *rec);
unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec);

14
kernel/trace/ftrace.c
View File

@ -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;