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Merge tag 'perf-urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent 

Pull perf fixes from Arnaldo Carvalho de Melo:

 * Endianness fixes from Jiri Olsa

 * Fixes for make perf tarball

 * Fix for DSO name in perf script callchains, from David Ahern

 * Segfault fixes for perf top --callchain, from Namhyung Kim

 * Minor function result fixes from Srikar Dronamraju

 * Add missing 3rd ioctl parameter, from Namhyung Kim

 * Fix pager usage in minimal embedded systems, from Avik Sil

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2012-06-06 08:40:10 +02:00
parent f9ba7179ce cb7225feec
commit 02e03040a3
21 changed files with 214 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/perf_event.h
View File

@ -555,6 +555,8 @@ enum perf_event_type {
PERF_RECORD_MAX, /* non-ABI */
};
#define PERF_MAX_STACK_DEPTH 255
enum perf_callchain_context {
PERF_CONTEXT_HV = (__u64)-32,
PERF_CONTEXT_KERNEL = (__u64)-128,
@ -609,8 +611,6 @@ struct perf_guest_info_callbacks {
#include <linux/sysfs.h>
#include <asm/local.h>
#define PERF_MAX_STACK_DEPTH 255
struct perf_callchain_entry {
__u64 nr;
__u64 ip[PERF_MAX_STACK_DEPTH];

1
kernel/events/core.c
View File

@ -3181,7 +3181,6 @@ static void perf_event_for_each(struct perf_event *event,
event = event->group_leader;
perf_event_for_each_child(event, func);
func(event);
list_for_each_entry(sibling, &event->sibling_list, group_entry)
perf_event_for_each_child(sibling, func);
mutex_unlock(&ctx->mutex);

2
tools/perf/MANIFEST
View File

@ -1,4 +1,6 @@
tools/perf
tools/scripts
tools/lib/traceevent
include/linux/const.h
include/linux/perf_event.h
include/linux/rbtree.h

4
tools/perf/builtin-report.c
View File

@ -152,7 +152,7 @@ static int perf_evsel__add_hist_entry(struct perf_evsel *evsel,
if (symbol_conf.use_callchain) {
err = callchain_append(he->callchain,
&evsel->hists.callchain_cursor,
&callchain_cursor,
sample->period);
if (err)
return err;
@ -162,7 +162,7 @@ static int perf_evsel__add_hist_entry(struct perf_evsel *evsel,
* so we don't allocated the extra space needed because the stdio
* code will not use it.
*/
if (al->sym != NULL && use_browser > 0) {
if (he->ms.sym != NULL && use_browser > 0) {
struct annotation *notes = symbol__annotation(he->ms.sym);
assert(evsel != NULL);

8
tools/perf/builtin-stat.c
View File

@ -1129,7 +1129,7 @@ static int add_default_attributes(void)
return 0;
if (!evsel_list->nr_entries) {
if (perf_evlist__add_attrs_array(evsel_list, default_attrs) < 0)
if (perf_evlist__add_default_attrs(evsel_list, default_attrs) < 0)
return -1;
}
@ -1139,21 +1139,21 @@ static int add_default_attributes(void)
return 0;
/* Append detailed run extra attributes: */
if (perf_evlist__add_attrs_array(evsel_list, detailed_attrs) < 0)
if (perf_evlist__add_default_attrs(evsel_list, detailed_attrs) < 0)
return -1;
if (detailed_run < 2)
return 0;
/* Append very detailed run extra attributes: */
if (perf_evlist__add_attrs_array(evsel_list, very_detailed_attrs) < 0)
if (perf_evlist__add_default_attrs(evsel_list, very_detailed_attrs) < 0)
return -1;
if (detailed_run < 3)
return 0;
/* Append very, very detailed run extra attributes: */
return perf_evlist__add_attrs_array(evsel_list, very_very_detailed_attrs);
return perf_evlist__add_default_attrs(evsel_list, very_very_detailed_attrs);
}
int cmd_stat(int argc, const char **argv, const char *prefix __used)

2
tools/perf/builtin-top.c
View File

@ -787,7 +787,7 @@ static void perf_event__process_sample(struct perf_tool *tool,
}
if (symbol_conf.use_callchain) {
err = callchain_append(he->callchain, &evsel->hists.callchain_cursor,
err = callchain_append(he->callchain, &callchain_cursor,
sample->period);
if (err)
return;

7
tools/perf/design.txt
View File

@ -409,14 +409,15 @@ Counters can be enabled and disabled in two ways: via ioctl and via
prctl. When a counter is disabled, it doesn't count or generate
events but does continue to exist and maintain its count value.
An individual counter or counter group can be enabled with
An individual counter can be enabled with
ioctl(fd, PERF_EVENT_IOC_ENABLE);
ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
or disabled with
ioctl(fd, PERF_EVENT_IOC_DISABLE);
ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
For a counter group, pass PERF_IOC_FLAG_GROUP as the third argument.
Enabling or disabling the leader of a group enables or disables the
whole group; that is, while the group leader is disabled, none of the
counters in the group will count. Enabling or disabling a member of a

2
tools/perf/ui/browsers/annotate.c
View File

@ -668,7 +668,7 @@ static int annotate_browser__run(struct annotate_browser *browser, int evidx,
"q/ESC/CTRL+C Exit\n\n"
"-> Go to target\n"
"<- Exit\n"
"h Cycle thru hottest instructions\n"
"H Cycle thru hottest instructions\n"
"j Toggle showing jump to target arrows\n"
"J Toggle showing number of jump sources on targets\n"
"n Search next string\n"

2
tools/perf/util/PERF-VERSION-GEN
View File

@ -12,7 +12,7 @@ LF='
# First check if there is a .git to get the version from git describe
# otherwise try to get the version from the kernel makefile
if test -d ../../.git -o -f ../../.git &&
VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
VN=$(git describe --match 'v[0-9].[0-9]*' --abbrev=4 HEAD 2>/dev/null) &&
case "$VN" in
*$LF*) (exit 1) ;;
v[0-9]*)

2
tools/perf/util/callchain.c
View File

@ -18,6 +18,8 @@
#include "util.h"
#include "callchain.h"
__thread struct callchain_cursor callchain_cursor;
bool ip_callchain__valid(struct ip_callchain *chain,
const union perf_event *event)
{

2
tools/perf/util/callchain.h
View File

@ -76,6 +76,8 @@ struct callchain_cursor {
struct callchain_cursor_node *curr;
};
extern __thread struct callchain_cursor callchain_cursor;
static inline void callchain_init(struct callchain_root *root)
{
INIT_LIST_HEAD(&root->node.siblings);

17
tools/perf/util/evlist.c
View File

@ -159,6 +159,17 @@ out_delete_partial_list:
return -1;
}
int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
struct perf_event_attr *attrs, size_t nr_attrs)
{
size_t i;
for (i = 0; i < nr_attrs; i++)
event_attr_init(attrs + i);
return perf_evlist__add_attrs(evlist, attrs, nr_attrs);
}
static int trace_event__id(const char *evname)
{
char *filename, *colon;
@ -263,7 +274,8 @@ void perf_evlist__disable(struct perf_evlist *evlist)
for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
list_for_each_entry(pos, &evlist->entries, node) {
for (thread = 0; thread < evlist->threads->nr; thread++)
ioctl(FD(pos, cpu, thread), PERF_EVENT_IOC_DISABLE);
ioctl(FD(pos, cpu, thread),
PERF_EVENT_IOC_DISABLE, 0);
}
}
}
@ -276,7 +288,8 @@ void perf_evlist__enable(struct perf_evlist *evlist)
for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
list_for_each_entry(pos, &evlist->entries, node) {
for (thread = 0; thread < evlist->threads->nr; thread++)
ioctl(FD(pos, cpu, thread), PERF_EVENT_IOC_ENABLE);
ioctl(FD(pos, cpu, thread),
PERF_EVENT_IOC_ENABLE, 0);
}
}
}

4
tools/perf/util/evlist.h
View File

@ -54,6 +54,8 @@ void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry);
int perf_evlist__add_default(struct perf_evlist *evlist);
int perf_evlist__add_attrs(struct perf_evlist *evlist,
struct perf_event_attr *attrs, size_t nr_attrs);
int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
struct perf_event_attr *attrs, size_t nr_attrs);
int perf_evlist__add_tracepoints(struct perf_evlist *evlist,
const char *tracepoints[], size_t nr_tracepoints);
int perf_evlist__set_tracepoints_handlers(struct perf_evlist *evlist,
@ -62,6 +64,8 @@ int perf_evlist__set_tracepoints_handlers(struct perf_evlist *evlist,
#define perf_evlist__add_attrs_array(evlist, array) \
perf_evlist__add_attrs(evlist, array, ARRAY_SIZE(array))
#define perf_evlist__add_default_attrs(evlist, array) \
__perf_evlist__add_default_attrs(evlist, array, ARRAY_SIZE(array))
#define perf_evlist__add_tracepoints_array(evlist, array) \
perf_evlist__add_tracepoints(evlist, array, ARRAY_SIZE(array))

29
tools/perf/util/evsel.c
View File

@ -494,16 +494,24 @@ int perf_evsel__open_per_thread(struct perf_evsel *evsel,
}
static int perf_event__parse_id_sample(const union perf_event *event, u64 type,
struct perf_sample *sample)
struct perf_sample *sample,
bool swapped)
{
const u64 *array = event->sample.array;
union u64_swap u;
array += ((event->header.size -
sizeof(event->header)) / sizeof(u64)) - 1;
if (type & PERF_SAMPLE_CPU) {
u32 *p = (u32 *)array;
sample->cpu = *p;
u.val64 = *array;
if (swapped) {
/* undo swap of u64, then swap on individual u32s */
u.val64 = bswap_64(u.val64);
u.val32[0] = bswap_32(u.val32[0]);
}
sample->cpu = u.val32[0];
array--;
}
@ -523,9 +531,16 @@ static int perf_event__parse_id_sample(const union perf_event *event, u64 type,
}
if (type & PERF_SAMPLE_TID) {
u32 *p = (u32 *)array;
sample->pid = p[0];
sample->tid = p[1];
u.val64 = *array;
if (swapped) {
/* undo swap of u64, then swap on individual u32s */
u.val64 = bswap_64(u.val64);
u.val32[0] = bswap_32(u.val32[0]);
u.val32[1] = bswap_32(u.val32[1]);
}
sample->pid = u.val32[0];
sample->tid = u.val32[1];
}
return 0;
@ -562,7 +577,7 @@ int perf_event__parse_sample(const union perf_event *event, u64 type,
if (event->header.type != PERF_RECORD_SAMPLE) {
if (!sample_id_all)
return 0;
return perf_event__parse_id_sample(event, type, data);
return perf_event__parse_id_sample(event, type, data, swapped);
}
array = event->sample.array;

7
tools/perf/util/hist.c
View File

@ -378,7 +378,7 @@ void hist_entry__free(struct hist_entry *he)
* collapse the histogram
*/
static bool hists__collapse_insert_entry(struct hists *hists,
static bool hists__collapse_insert_entry(struct hists *hists __used,
struct rb_root *root,
struct hist_entry *he)
{
@ -397,8 +397,9 @@ static bool hists__collapse_insert_entry(struct hists *hists,
iter->period += he->period;
iter->nr_events += he->nr_events;
if (symbol_conf.use_callchain) {
callchain_cursor_reset(&hists->callchain_cursor);
callchain_merge(&hists->callchain_cursor, iter->callchain,
callchain_cursor_reset(&callchain_cursor);
callchain_merge(&callchain_cursor,
iter->callchain,
he->callchain);
}
hist_entry__free(he);

2
tools/perf/util/hist.h
View File

@ -67,8 +67,6 @@ struct hists {
struct events_stats stats;
u64 event_stream;
u16 col_len[HISTC_NR_COLS];
/* Best would be to reuse the session callchain cursor */
struct callchain_cursor callchain_cursor;
};
struct hist_entry *__hists__add_entry(struct hists *self,

4
tools/perf/util/pager.c
View File

@ -57,6 +57,10 @@ void setup_pager(void)
}
if (!pager)
pager = getenv("PAGER");
if (!pager) {
if (!access("/usr/bin/pager", X_OK))
pager = "/usr/bin/pager";
}
if (!pager)
pager = "less";
else if (!*pager || !strcmp(pager, "cat"))

8
tools/perf/util/probe-event.c
View File

@ -2164,16 +2164,12 @@ int del_perf_probe_events(struct strlist *dellist)
error:
if (kfd >= 0) {
if (namelist)
strlist__delete(namelist);
strlist__delete(namelist);
close(kfd);
}
if (ufd >= 0) {
if (unamelist)
strlist__delete(unamelist);
strlist__delete(unamelist);
close(ufd);
}

97
tools/perf/util/session.c
View File

@ -288,7 +288,8 @@ struct branch_info *machine__resolve_bstack(struct machine *self,
return bi;
}
int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel,
int machine__resolve_callchain(struct machine *self,
struct perf_evsel *evsel __used,
struct thread *thread,
struct ip_callchain *chain,
struct symbol **parent)
@ -297,7 +298,12 @@ int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel,
unsigned int i;
int err;
callchain_cursor_reset(&evsel->hists.callchain_cursor);
callchain_cursor_reset(&callchain_cursor);
if (chain->nr > PERF_MAX_STACK_DEPTH) {
pr_warning("corrupted callchain. skipping...\n");
return 0;
}
for (i = 0; i < chain->nr; i++) {
u64 ip;
@ -317,7 +323,14 @@ int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel,
case PERF_CONTEXT_USER:
cpumode = PERF_RECORD_MISC_USER; break;
default:
break;
pr_debug("invalid callchain context: "
"%"PRId64"\n", (s64) ip);
/*
* It seems the callchain is corrupted.
* Discard all.
*/
callchain_cursor_reset(&callchain_cursor);
return 0;
}
continue;
}
@ -333,7 +346,7 @@ int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel,
break;
}
err = callchain_cursor_append(&evsel->hists.callchain_cursor,
err = callchain_cursor_append(&callchain_cursor,
ip, al.map, al.sym);
if (err)
return err;
@ -441,37 +454,65 @@ void mem_bswap_64(void *src, int byte_size)
}
}
static void perf_event__all64_swap(union perf_event *event)
static void swap_sample_id_all(union perf_event *event, void *data)
{
void *end = (void *) event + event->header.size;
int size = end - data;
BUG_ON(size % sizeof(u64));
mem_bswap_64(data, size);
}
static void perf_event__all64_swap(union perf_event *event,
bool sample_id_all __used)
{
struct perf_event_header *hdr = &event->header;
mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
}
static void perf_event__comm_swap(union perf_event *event)
static void perf_event__comm_swap(union perf_event *event, bool sample_id_all)
{
event->comm.pid = bswap_32(event->comm.pid);
event->comm.tid = bswap_32(event->comm.tid);
if (sample_id_all) {
void *data = &event->comm.comm;
data += ALIGN(strlen(data) + 1, sizeof(u64));
swap_sample_id_all(event, data);
}
}
static void perf_event__mmap_swap(union perf_event *event)
static void perf_event__mmap_swap(union perf_event *event,
bool sample_id_all)
{
event->mmap.pid = bswap_32(event->mmap.pid);
event->mmap.tid = bswap_32(event->mmap.tid);
event->mmap.start = bswap_64(event->mmap.start);
event->mmap.len = bswap_64(event->mmap.len);
event->mmap.pgoff = bswap_64(event->mmap.pgoff);
if (sample_id_all) {
void *data = &event->mmap.filename;
data += ALIGN(strlen(data) + 1, sizeof(u64));
swap_sample_id_all(event, data);
}
}
static void perf_event__task_swap(union perf_event *event)
static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
{
event->fork.pid = bswap_32(event->fork.pid);
event->fork.tid = bswap_32(event->fork.tid);
event->fork.ppid = bswap_32(event->fork.ppid);
event->fork.ptid = bswap_32(event->fork.ptid);
event->fork.time = bswap_64(event->fork.time);
if (sample_id_all)
swap_sample_id_all(event, &event->fork + 1);
}
static void perf_event__read_swap(union perf_event *event)
static void perf_event__read_swap(union perf_event *event, bool sample_id_all)
{
event->read.pid = bswap_32(event->read.pid);
event->read.tid = bswap_32(event->read.tid);
@ -479,6 +520,9 @@ static void perf_event__read_swap(union perf_event *event)
event->read.time_enabled = bswap_64(event->read.time_enabled);
event->read.time_running = bswap_64(event->read.time_running);
event->read.id = bswap_64(event->read.id);
if (sample_id_all)
swap_sample_id_all(event, &event->read + 1);
}
static u8 revbyte(u8 b)
@ -530,7 +574,8 @@ void perf_event__attr_swap(struct perf_event_attr *attr)
swap_bitfield((u8 *) (&attr->read_format + 1), sizeof(u64));
}
static void perf_event__hdr_attr_swap(union perf_event *event)
static void perf_event__hdr_attr_swap(union perf_event *event,
bool sample_id_all __used)
{
size_t size;
@ -541,18 +586,21 @@ static void perf_event__hdr_attr_swap(union perf_event *event)
mem_bswap_64(event->attr.id, size);
}
static void perf_event__event_type_swap(union perf_event *event)
static void perf_event__event_type_swap(union perf_event *event,
bool sample_id_all __used)
{
event->event_type.event_type.event_id =
bswap_64(event->event_type.event_type.event_id);
}
static void perf_event__tracing_data_swap(union perf_event *event)
static void perf_event__tracing_data_swap(union perf_event *event,
bool sample_id_all __used)
{
event->tracing_data.size = bswap_32(event->tracing_data.size);
}
typedef void (*perf_event__swap_op)(union perf_event *event);
typedef void (*perf_event__swap_op)(union perf_event *event,
bool sample_id_all);
static perf_event__swap_op perf_event__swap_ops[] = {
[PERF_RECORD_MMAP] = perf_event__mmap_swap,
@ -986,6 +1034,15 @@ static int perf_session__process_user_event(struct perf_session *session, union
}
}
static void event_swap(union perf_event *event, bool sample_id_all)
{
perf_event__swap_op swap;
swap = perf_event__swap_ops[event->header.type];
if (swap)
swap(event, sample_id_all);
}
static int perf_session__process_event(struct perf_session *session,
union perf_event *event,
struct perf_tool *tool,
@ -994,9 +1051,8 @@ static int perf_session__process_event(struct perf_session *session,
struct perf_sample sample;
int ret;
if (session->header.needs_swap &&
perf_event__swap_ops[event->header.type])
perf_event__swap_ops[event->header.type](event);
if (session->header.needs_swap)
event_swap(event, session->sample_id_all);
if (event->header.type >= PERF_RECORD_HEADER_MAX)
return -EINVAL;
@ -1428,7 +1484,6 @@ void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
int print_sym, int print_dso, int print_symoffset)
{
struct addr_location al;
struct callchain_cursor *cursor = &evsel->hists.callchain_cursor;
struct callchain_cursor_node *node;
if (perf_event__preprocess_sample(event, machine, &al, sample,
@ -1446,10 +1501,10 @@ void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
error("Failed to resolve callchain. Skipping\n");
return;
}
callchain_cursor_commit(cursor);
callchain_cursor_commit(&callchain_cursor);
while (1) {
node = callchain_cursor_current(cursor);
node = callchain_cursor_current(&callchain_cursor);
if (!node)
break;
@ -1460,12 +1515,12 @@ void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
}
if (print_dso) {
printf(" (");
map__fprintf_dsoname(al.map, stdout);
map__fprintf_dsoname(node->map, stdout);
printf(")");
}
printf("\n");
callchain_cursor_advance(cursor);
callchain_cursor_advance(&callchain_cursor);
}
} else {

38
tools/perf/util/symbol.c
View File

@ -323,6 +323,7 @@ struct dso *dso__new(const char *name)
dso->sorted_by_name = 0;
dso->has_build_id = 0;
dso->kernel = DSO_TYPE_USER;
dso->needs_swap = DSO_SWAP__UNSET;
INIT_LIST_HEAD(&dso->node);
}
@ -1156,6 +1157,33 @@ static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
return -1;
}
static int dso__swap_init(struct dso *dso, unsigned char eidata)
{
static unsigned int const endian = 1;
dso->needs_swap = DSO_SWAP__NO;
switch (eidata) {
case ELFDATA2LSB:
/* We are big endian, DSO is little endian. */
if (*(unsigned char const *)&endian != 1)
dso->needs_swap = DSO_SWAP__YES;
break;
case ELFDATA2MSB:
/* We are little endian, DSO is big endian. */
if (*(unsigned char const *)&endian != 0)
dso->needs_swap = DSO_SWAP__YES;
break;
default:
pr_err("unrecognized DSO data encoding %d\n", eidata);
return -EINVAL;
}
return 0;
}
static int dso__load_sym(struct dso *dso, struct map *map, const char *name,
int fd, symbol_filter_t filter, int kmodule,
int want_symtab)
@ -1187,6 +1215,9 @@ static int dso__load_sym(struct dso *dso, struct map *map, const char *name,
goto out_elf_end;
}
if (dso__swap_init(dso, ehdr.e_ident[EI_DATA]))
goto out_elf_end;
/* Always reject images with a mismatched build-id: */
if (dso->has_build_id) {
u8 build_id[BUILD_ID_SIZE];
@ -1272,7 +1303,7 @@ static int dso__load_sym(struct dso *dso, struct map *map, const char *name,
if (opdsec && sym.st_shndx == opdidx) {
u32 offset = sym.st_value - opdshdr.sh_addr;
u64 *opd = opddata->d_buf + offset;
sym.st_value = *opd;
sym.st_value = DSO__SWAP(dso, u64, *opd);
sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
}
@ -2786,8 +2817,11 @@ int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
struct map *dso__new_map(const char *name)
{
struct map *map = NULL;
struct dso *dso = dso__new(name);
struct map *map = map__new2(0, dso, MAP__FUNCTION);
if (dso)
map = map__new2(0, dso, MAP__FUNCTION);
return map;
}

30
tools/perf/util/symbol.h
View File

@ -9,6 +9,7 @@
#include <linux/list.h>
#include <linux/rbtree.h>
#include <stdio.h>
#include <byteswap.h>
#ifdef HAVE_CPLUS_DEMANGLE
extern char *cplus_demangle(const char *, int);
@ -160,11 +161,18 @@ enum dso_kernel_type {
DSO_TYPE_GUEST_KERNEL
};
enum dso_swap_type {
DSO_SWAP__UNSET,
DSO_SWAP__NO,
DSO_SWAP__YES,
};
struct dso {
struct list_head node;
struct rb_root symbols[MAP__NR_TYPES];
struct rb_root symbol_names[MAP__NR_TYPES];
enum dso_kernel_type kernel;
enum dso_swap_type needs_swap;
u8 adjust_symbols:1;
u8 has_build_id:1;
u8 hit:1;
@ -182,6 +190,28 @@ struct dso {
char name[0];
};
#define DSO__SWAP(dso, type, val) \
({ \
type ____r = val; \
BUG_ON(dso->needs_swap == DSO_SWAP__UNSET); \
if (dso->needs_swap == DSO_SWAP__YES) { \
switch (sizeof(____r)) { \
case 2: \
____r = bswap_16(val); \
break; \
case 4: \
____r = bswap_32(val); \
break; \
case 8: \
____r = bswap_64(val); \
break; \
default: \
BUG_ON(1); \
} \
} \
____r; \
})
struct dso *dso__new(const char *name);
void dso__delete(struct dso *dso);