lethal at linux-sh
Nov 9, 2009, 12:37 AM
Post #1 of 2
(96 views)
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[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 [at] linux-sh>
---
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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