Merge tag 'tracing-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

Tanish Desai and Paolo Bonzini's tracing Rust support.

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* tag 'tracing-pull-request' of https://gitlab.com/stefanha/qemu:
  tracetool/syslog: add Rust support
  tracetool/ftrace: add Rust support
  tracetool/log: add Rust support
  log: change qemu_loglevel to unsigned
  tracetool/simple: add Rust support
  rust: pl011: add tracepoints
  rust: qdev: add minimal clock bindings
  rust: add trace crate
  tracetool: Add Rust format support
  tracetool/backend: remove redundant trace event checks
  tracetool: add CHECK_TRACE_EVENT_GET_STATE
  trace/ftrace: move snprintf+write from tracepoints to ftrace.c
  tracetool: add SPDX headers
  treewide: remove unnessary "coding" header
  tracetool: remove dead code
  tracetool: fix usage of try_import()

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/trace/ftrace.c b/trace/ftrace.c
index 9749543d9b..6875faedb9 100644
--- a/trace/ftrace.c
+++ b/trace/ftrace.c
@@ -38,6 +38,21 @@ static int find_mount(char *mount_point, const char *fstype)
     return ret;
 }
 
+void ftrace_write(const char *fmt, ...)
+{
+    char ftrace_buf[MAX_TRACE_STRLEN];
+    int unused __attribute__ ((unused));
+    int trlen;
+    va_list ap;
+
+    va_start(ap, fmt);
+    trlen = vsnprintf(ftrace_buf, MAX_TRACE_STRLEN, fmt, ap);
+    va_end(ap);
+
+    trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);
+    unused = write(trace_marker_fd, ftrace_buf, trlen);
+}
+
 bool ftrace_init(void)
 {
     char mount_point[PATH_MAX];