linux-kernel - [PATCH RFC 13/19] perf buildid-cache: kcore

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Message-Id: <1525866228-30321-14-git-send-email-adrian.hunter@intel.com>
Date:   Wed,  9 May 2018 14:43:42 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...ux.intel.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>, Jiri Olsa <jolsa@...hat.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [PATCH RFC 13/19] perf buildid-cache: kcore_copy: Keep a count of phdrs

In preparation to add more program headers, keep a count of phdrs.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/symbol-elf.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 7faca21141a2..3a177c245683 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -1398,6 +1398,7 @@ struct kcore_copy_info {
 	u64 last_symbol;
 	u64 first_module;
 	u64 last_module_symbol;
+	size_t phnum;
 	struct phdr_data kernel_map;
 	struct phdr_data modules_map;
 	struct list_head phdrs;
@@ -1517,6 +1518,8 @@ static int kcore_copy__read_maps(struct kcore_copy_info *kci, Elf *elf)
 	if (kci->modules_map.len)
 		list_add_tail(&kci->modules_map.list, &kci->phdrs);
 
+	kci->phnum = !!kci->kernel_map.len + !!kci->modules_map.len;
+
 	return 0;
 }
 
@@ -1678,7 +1681,6 @@ int kcore_copy(const char *from_dir, const char *to_dir)
 {
 	struct kcore kcore;
 	struct kcore extract;
-	size_t count = 2;
 	int idx = 0, err = -1;
 	off_t offset = page_size, sz, modules_offset = 0;
 	struct kcore_copy_info kci = { .stext = 0, };
@@ -1705,10 +1707,7 @@ int kcore_copy(const char *from_dir, const char *to_dir)
 	if (kcore__init(&extract, extract_filename, kcore.elfclass, false))
 		goto out_kcore_close;
 
-	if (!kci.modules_map.addr)
-		count -= 1;
-
-	if (kcore__copy_hdr(&kcore, &extract, count))
+	if (kcore__copy_hdr(&kcore, &extract, kci.phnum))
 		goto out_extract_close;
 
 	if (kcore__add_phdr(&extract, idx++, offset, kci.kernel_map.addr,
-- 
1.9.1