[PATCH V3 15/17] perf buildid-cache: kcore_copy: Get rid of kernel_map

Adrian Hunter
2018-05-22T10:57:04Z

In preparation to add more program headers, get rid of kernel_map and
modules_map by moving ->kernel_map and ->modules_map to newly allocated
entries in the ->phdrs list.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/util/symbol-elf.c | 70 ++++++++++++++++++++++++++++++++------------
1 file changed, 52 insertions(+), 18 deletions(-)

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 91b8cfb045ec..37d9324c277c 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -1400,14 +1400,47 @@ struct kcore_copy_info {
u64 first_module;
u64 last_module_symbol;
size_t phnum;
- struct phdr_data kernel_map;
- struct phdr_data modules_map;
struct list_head phdrs;
};

#define kcore_copy__for_each_phdr(k, p) \
list_for_each_entry((p), &(k)->phdrs, node)

+static struct phdr_data *phdr_data__new(u64 addr, u64 len, off_t offset)
+{
+ struct phdr_data *p = zalloc(sizeof(*p));
+
+ if (p) {
+ p->addr = addr;
+ p->len = len;
+ p->offset = offset;
+ }
+
+ return p;
+}
+
+static struct phdr_data *kcore_copy_info__addnew(struct kcore_copy_info *kci,
+ u64 addr, u64 len,
+ off_t offset)
+{
+ struct phdr_data *p = phdr_data__new(addr, len, offset);
+
+ if (p)
+ list_add_tail(&p->node, &kci->phdrs);
+
+ return p;
+}
+
+static void kcore_copy__free_phdrs(struct kcore_copy_info *kci)
+{
+ struct phdr_data *p, *tmp;
+
+ list_for_each_entry_safe(p, tmp, &kci->phdrs, node) {
+ list_del(&p->node);
+ free(p);
+ }
+}
+
static int kcore_copy__process_kallsyms(void *arg, const char *name, char type,
u64 start)
{
@@ -1487,15 +1520,18 @@ static int kcore_copy__parse_modules(struct kcore_copy_info *kci,
return 0;
}

-static void kcore_copy__map(struct phdr_data *p, u64 start, u64 end, u64 pgoff,
- u64 s, u64 e)
+static int kcore_copy__map(struct kcore_copy_info *kci, u64 start, u64 end,
+ u64 pgoff, u64 s, u64 e)
{
- if (p->addr || s < start || s >= end)
- return;
+ u64 len, offset;
+
+ if (s < start || s >= end)
+ return 0;

- p->addr = s;
- p->offset = (s - start) + pgoff;
- p->len = e < end ? e - s : end - s;
+ offset = (s - start) + pgoff;
+ len = e < end ? e - s : end - s;
+
+ return kcore_copy_info__addnew(kci, s, len, offset) ? 0 : -1;
}

static int kcore_copy__read_map(u64 start, u64 len, u64 pgoff, void *data)
@@ -1503,11 +1539,12 @@ static int kcore_copy__read_map(u64 start, u64 len, u64 pgoff, void *data)
struct kcore_copy_info *kci = data;
u64 end = start + len;

- kcore_copy__map(&kci->kernel_map, start, end, pgoff, kci->stext,
- kci->etext);
+ if (kcore_copy__map(kci, start, end, pgoff, kci->stext, kci->etext))
+ return -1;

- kcore_copy__map(&kci->modules_map, start, end, pgoff, kci->first_module,
- kci->last_module_symbol);
+ if (kcore_copy__map(kci, start, end, pgoff, kci->first_module,
+ kci->last_module_symbol))
+ return -1;

return 0;
}
@@ -1517,11 +1554,6 @@ static int kcore_copy__read_maps(struct kcore_copy_info *kci, Elf *elf)
if (elf_read_maps(elf, true, kcore_copy__read_map, kci) < 0)
return -1;

- if (kci->kernel_map.len)
- list_add_tail(&kci->kernel_map.node, &kci->phdrs);
- if (kci->modules_map.len)
- list_add_tail(&kci->modules_map.node, &kci->phdrs);
-
return 0;
}

@@ -1773,6 +1805,8 @@ int kcore_copy(const char *from_dir, const char *to_dir)
if (err)
kcore_copy__unlink(to_dir, "kallsyms");

+ kcore_copy__free_phdrs(&kci);
+
return err;
}

--
1.9.1