linux-stable/tools/perf/util/perf-hooks.c
Arnaldo Carvalho de Melo fb71c86cc8 perf tools: Remove util.h from where it is not needed
Check that it is not needed and remove, fixing up some fallout for
places where it was only serving to get something else.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-9h6dg6lsqe2usyqjh5rrues4@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2019-09-20 09:19:20 -03:00

90 lines
2 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* perf_hooks.c
*
* Copyright (C) 2016 Wang Nan <wangnan0@huawei.com>
* Copyright (C) 2016 Huawei Inc.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include "util/debug.h"
#include "util/perf-hooks.h"
static sigjmp_buf jmpbuf;
static const struct perf_hook_desc *current_perf_hook;
void perf_hooks__invoke(const struct perf_hook_desc *desc)
{
if (!(desc && desc->p_hook_func && *desc->p_hook_func))
return;
if (sigsetjmp(jmpbuf, 1)) {
pr_warning("Fatal error (SEGFAULT) in perf hook '%s'\n",
desc->hook_name);
*(current_perf_hook->p_hook_func) = NULL;
} else {
current_perf_hook = desc;
(**desc->p_hook_func)(desc->hook_ctx);
}
current_perf_hook = NULL;
}
void perf_hooks__recover(void)
{
if (current_perf_hook)
siglongjmp(jmpbuf, 1);
}
#define PERF_HOOK(name) \
perf_hook_func_t __perf_hook_func_##name = NULL; \
struct perf_hook_desc __perf_hook_desc_##name = \
{.hook_name = #name, \
.p_hook_func = &__perf_hook_func_##name, \
.hook_ctx = NULL};
#include "perf-hooks-list.h"
#undef PERF_HOOK
#define PERF_HOOK(name) \
&__perf_hook_desc_##name,
static struct perf_hook_desc *perf_hooks[] = {
#include "perf-hooks-list.h"
};
#undef PERF_HOOK
int perf_hooks__set_hook(const char *hook_name,
perf_hook_func_t hook_func,
void *hook_ctx)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(perf_hooks); i++) {
if (strcmp(hook_name, perf_hooks[i]->hook_name) != 0)
continue;
if (*(perf_hooks[i]->p_hook_func))
pr_warning("Overwrite existing hook: %s\n", hook_name);
*(perf_hooks[i]->p_hook_func) = hook_func;
perf_hooks[i]->hook_ctx = hook_ctx;
return 0;
}
return -ENOENT;
}
perf_hook_func_t perf_hooks__get_hook(const char *hook_name)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(perf_hooks); i++) {
if (strcmp(hook_name, perf_hooks[i]->hook_name) != 0)
continue;
return *(perf_hooks[i]->p_hook_func);
}
return ERR_PTR(-ENOENT);
}