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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-03-03 16:15:39 -0500 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-03-24 20:51:49 -0400 |
| commit | 42c269c88dc146982a54a8267f71abc99f12852a (patch) | |
| tree | 2fecaaec16fe65febc290be5d67b396d0d0f75e3 /mm | |
| parent | dbeafd0d6131d0f6ae8cd7551f5f4bf8c54aa49a (diff) | |
| download | linux-42c269c88dc146982a54a8267f71abc99f12852a.tar.gz linux-42c269c88dc146982a54a8267f71abc99f12852a.tar.bz2 linux-42c269c88dc146982a54a8267f71abc99f12852a.zip | |
ftrace: Allow for function tracing to record init functions on boot up
Adding a hook into free_reserve_area() that informs ftrace that boot up init
text is being free, lets ftrace safely remove those init functions from its
records, which keeps ftrace from trying to modify text that no longer
exists.
Note, this still does not allow for tracing .init text of modules, as
modules require different work for freeing its init code.
Link: http://lkml.kernel.org/r/1488502497.7212.24.camel@linux.intel.com
Cc: linux-mm@kvack.org
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Requested-by: Todd Brandt <todd.e.brandt@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page_alloc.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 6cbde310abed..eee82bfb7cd8 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -65,6 +65,7 @@ #include <linux/page_owner.h> #include <linux/kthread.h> #include <linux/memcontrol.h> +#include <linux/ftrace.h> #include <asm/sections.h> #include <asm/tlbflush.h> @@ -6605,6 +6606,9 @@ unsigned long free_reserved_area(void *start, void *end, int poison, char *s) void *pos; unsigned long pages = 0; + /* This may be .init text, inform ftrace to remove it */ + ftrace_free_mem(start, end); + start = (void *)PAGE_ALIGN((unsigned long)start); end = (void *)((unsigned long)end & PAGE_MASK); for (pos = start; pos < end; pos += PAGE_SIZE, pages++) { |