forked from mirrors/linux
fb71c86cc8
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>
90 lines
2 KiB
C
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);
|
|
}
|