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| author | Arnd Bergmann <arnd@arndb.de> | 2023-01-30 14:02:37 +0100 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-02-07 12:45:18 -0500 |
| commit | f94fe7048a352ff8914232a18e2e2f18f8a5ac81 (patch) | |
| tree | 9b96a78f94513761045115e8bfbc18c7dfe3b468 /samples | |
| parent | 01678fbce3dd2e3042077cf71b68157e733614a0 (diff) | |
| download | linux-f94fe7048a352ff8914232a18e2e2f18f8a5ac81.tar.gz | |
ftrace: sample: avoid open-coded 64-bit division
Calculating the average period requires a 64-bit division that leads
to a link failure on 32-bit architectures:
x86_64-linux-ld: samples/ftrace/ftrace-ops.o: in function `ftrace_ops_sample_init':
ftrace-ops.c:(.init.text+0x23b): undefined reference to `__udivdi3'
Use the div_u64() helper to do this instead. Since this is an init function that
is not called frequently, the runtime overhead is going to be acceptable.
Link: https://lore.kernel.org/linux-trace-kernel/20230130130246.247537-1-arnd@kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Fixes: b56c68f705ca ("ftrace: Add sample with custom ops")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/ftrace/ftrace-ops.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/samples/ftrace/ftrace-ops.c b/samples/ftrace/ftrace-ops.c index 24deb51c726187..0c8da87ff5c3f0 100644 --- a/samples/ftrace/ftrace-ops.c +++ b/samples/ftrace/ftrace-ops.c @@ -223,7 +223,7 @@ static int __init ftrace_ops_sample_init(void) pr_info("Attempted %u calls to %ps in %lluns (%lluns / call)\n", nr_function_calls, tracee_relevant, - period, period / nr_function_calls); + period, div_u64(period, nr_function_calls)); if (persist) return 0; |