diff options
Diffstat (limited to 'tools/perf/util/pstack.c')
| -rw-r--r-- | tools/perf/util/pstack.c | 20 |
1 files changed, 8 insertions, 12 deletions
diff --git a/tools/perf/util/pstack.c b/tools/perf/util/pstack.c index daa17aeb6c63..141ffa129c69 100644 --- a/tools/perf/util/pstack.c +++ b/tools/perf/util/pstack.c @@ -1,18 +1,21 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Simple pointer stack * * (c) 2010 Arnaldo Carvalho de Melo <acme@redhat.com> */ -#include "util.h" #include "pstack.h" +#include "debug.h" #include <linux/kernel.h> +#include <linux/zalloc.h> #include <stdlib.h> +#include <string.h> struct pstack { unsigned short top; unsigned short max_nr_entries; - void *entries[0]; + void *entries[]; }; struct pstack *pstack__new(unsigned short max_nr_entries) @@ -60,16 +63,9 @@ void pstack__push(struct pstack *pstack, void *key) pstack->entries[pstack->top++] = key; } -void *pstack__pop(struct pstack *pstack) +void *pstack__peek(struct pstack *pstack) { - void *ret; - - if (pstack->top == 0) { - pr_err("%s: underflow!\n", __func__); + if (pstack->top == 0) return NULL; - } - - ret = pstack->entries[--pstack->top]; - pstack->entries[pstack->top] = NULL; - return ret; + return pstack->entries[pstack->top - 1]; } |