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ftrace: Allow for function tracing to record init functions on boot up

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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>
This commit is contained in:
Steven Rostedt (VMware)
2017-03-03 16:15:39 -05:00
parent dbeafd0d61
commit 42c269c88d
6 changed files with 58 additions and 1 deletions
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4
include/linux/init.h
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@@ -39,7 +39,7 @@
/* These are for everybody (although not all archs will actually
discard it in modules) */
#define __init __section(.init.text) __cold notrace __latent_entropy
#define __init __section(.init.text) __cold __inittrace __latent_entropy
#define __initdata __section(.init.data)
#define __initconst __section(.init.rodata)
#define __exitdata __section(.exit.data)
@@ -68,8 +68,10 @@
#ifdef MODULE
#define __exitused
#define __inittrace notrace
#else
#define __exitused __used
#define __inittrace
#endif
#define __exit __section(.exit.text) __exitused __cold notrace