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| author | Steven Rostedt <rostedt@goodmis.org> | 2024-10-19 15:29:51 -0400 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2024-10-29 07:43:01 -0400 |
| commit | 6ea8b69da6bf1b8a0e4683f37a006a2e2f4fc943 (patch) | |
| tree | 925a8af4a54befde185b8af8717c37babf42d752 | |
| parent | 81ec38ee9d31bcd5ee24fce3f197a4ad211be575 (diff) | |
| download | lwn-6ea8b69da6bf1b8a0e4683f37a006a2e2f4fc943.tar.gz lwn-6ea8b69da6bf1b8a0e4683f37a006a2e2f4fc943.zip | |
fgraph: Separate size of ret_stack from PAGE_SIZE
The ret_stack (shadow stack used by function graph infrastructure) is
currently defined as PAGE_SIZE. But some architectures which have 64K
PAGE_SIZE, this is way overkill. Also there's an effort to allow the
PAGE_SIZE to be defined at boot up.
Hard code it for now to 4096. In the future, this size may change and even
be dependent on specific architectures.
Link: https://lore.kernel.org/all/e5067bb8-0fcd-4739-9bca-0e872037d5a1@arm.com/
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20241019152951.053f9646@rorschach.local.home
Suggested-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
| -rw-r--r-- | kernel/trace/fgraph.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c index 13fcc25d15a0..4ce87982966a 100644 --- a/kernel/trace/fgraph.c +++ b/kernel/trace/fgraph.c @@ -153,7 +153,7 @@ enum { * SHADOW_STACK_OFFSET: The size in long words of the shadow stack * SHADOW_STACK_MAX_OFFSET: The max offset of the stack for a new frame to be added */ -#define SHADOW_STACK_SIZE (PAGE_SIZE) +#define SHADOW_STACK_SIZE (4096) #define SHADOW_STACK_OFFSET (SHADOW_STACK_SIZE / sizeof(long)) /* Leave on a buffer at the end */ #define SHADOW_STACK_MAX_OFFSET \ |