Messages in this thread Patch in this message | | | Date | Mon, 9 Nov 2009 17:37:34 +0900 | From | Paul Mundt <> | Subject | [PATCH -tip] ksym_tracer: Support read accesses independent of read/write. |
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All of the infrastructure already exists to support read accesses for platforms that support a read access independently of read/write (such as in the case of the SuperH UBC). This just trivially hooks up the read case by itself.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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Applies on top of v6 of the hw-breakpoints perf event rewrite (and tracing/hw-breakpoints in -tip as of this moment).
kernel/trace/trace_ksym.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c index fea83ee..11935b5 100644 --- a/kernel/trace/trace_ksym.c +++ b/kernel/trace/trace_ksym.c @@ -136,6 +136,7 @@ static int ksym_trace_get_access_type(char *str) access |= HW_BREAKPOINT_X; switch (access) { + case HW_BREAKPOINT_R: case HW_BREAKPOINT_W: case HW_BREAKPOINT_W | HW_BREAKPOINT_R: return access; @@ -239,7 +240,9 @@ static ssize_t ksym_trace_filter_read(struct file *filp, char __user *ubuf, hlist_for_each_entry(entry, node, &ksym_filter_head, ksym_hlist) { ret = trace_seq_printf(s, "%pS:", (void *)entry->ksym_addr); - if (entry->type == HW_BREAKPOINT_W) + if (entry->type == HW_BREAKPOINT_R) + ret = trace_seq_puts(s, "r--\n"); + else if (entry->type == HW_BREAKPOINT_W) ret = trace_seq_puts(s, "-w-\n"); else if (entry->type == (HW_BREAKPOINT_W | HW_BREAKPOINT_R)) ret = trace_seq_puts(s, "rw-\n"); @@ -414,6 +417,9 @@ static enum print_line_t ksym_trace_output(struct trace_iterator *iter) return TRACE_TYPE_PARTIAL_LINE; switch (field->type) { + case HW_BREAKPOINT_R: + ret = trace_seq_printf(s, " R "); + break; case HW_BREAKPOINT_W: ret = trace_seq_printf(s, " W "); break; @@ -488,6 +494,9 @@ static int ksym_tracer_stat_show(struct seq_file *m, void *v) access_type = entry->type; switch (access_type) { + case HW_BREAKPOINT_R: + seq_puts(m, " R "); + break; case HW_BREAKPOINT_W: seq_puts(m, " W "); break;
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