Messages in this thread Patch in this message | | | From | Tom Zanussi <> | Subject | [PATCH v2 2/4] tracing: Make synth_event trace functions endian-correct | Date | Fri, 14 Feb 2020 16:56:39 -0600 |
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synth_event_trace(), synth_event_trace_array() and __synth_event_add_val() write directly into the trace buffer and need to take endianness into account, like trace_event_raw_event_synth() does.
Signed-off-by: Tom Zanussi <zanussi@kernel.org> --- kernel/trace/trace_events_hist.c | 62 +++++++++++++++++++++++++++++++++++++--- 1 file changed, 58 insertions(+), 4 deletions(-)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 483b3fd1094f..913760d2d505 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -1898,7 +1898,25 @@ int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...) strscpy(str_field, str_val, STR_VAR_LEN_MAX); n_u64 += STR_VAR_LEN_MAX / sizeof(u64); } else { - state.entry->fields[n_u64] = val; + struct synth_field *field = state.event->fields[i]; + + switch (field->size) { + case 1: + *(u8 *)&state.entry->fields[n_u64] = (u8)val; + break; + + case 2: + *(u16 *)&state.entry->fields[n_u64] = (u16)val; + break; + + case 4: + *(u32 *)&state.entry->fields[n_u64] = (u32)val; + break; + + default: + state.entry->fields[n_u64] = val; + break; + } n_u64++; } } @@ -1950,7 +1968,26 @@ int synth_event_trace_array(struct trace_event_file *file, u64 *vals, strscpy(str_field, str_val, STR_VAR_LEN_MAX); n_u64 += STR_VAR_LEN_MAX / sizeof(u64); } else { - state.entry->fields[n_u64] = vals[i]; + struct synth_field *field = state.event->fields[i]; + u64 val = vals[i]; + + switch (field->size) { + case 1: + *(u8 *)&state.entry->fields[n_u64] = (u8)val; + break; + + case 2: + *(u16 *)&state.entry->fields[n_u64] = (u16)val; + break; + + case 4: + *(u32 *)&state.entry->fields[n_u64] = (u32)val; + break; + + default: + state.entry->fields[n_u64] = val; + break; + } n_u64++; } } @@ -2069,8 +2106,25 @@ static int __synth_event_add_val(const char *field_name, u64 val, str_field = (char *)&entry->fields[field->offset]; strscpy(str_field, str_val, STR_VAR_LEN_MAX); - } else - entry->fields[field->offset] = val; + } else { + switch (field->size) { + case 1: + *(u8 *)&trace_state->entry->fields[field->offset] = (u8)val; + break; + + case 2: + *(u16 *)&trace_state->entry->fields[field->offset] = (u16)val; + break; + + case 4: + *(u32 *)&trace_state->entry->fields[field->offset] = (u32)val; + break; + + default: + trace_state->entry->fields[field->offset] = val; + break; + } + } out: return ret; } -- 2.14.1
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