[PATCH] makedumpfile: Error on re-filtering the dump file with no free pages

[Zaslonko Mikhail]

Please find the enclosed patch below.

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From 627b4c8085269251f6d66627dada447909bceafd Mon Sep 17 00:00:00 2001
From: root <root at s8345025.boeblingen.de.ibm.com>
Date: Tue, 16 May 2017 14:08:14 +0200
Subject: [PATCH] makedumpfile: Error on re-filtering the dump file with no
 free pages

When re-filtering the dump file after the free pages have already been
stripped out we get an error "Can't get necessary symbols for excluding
free pages" if newly specified dump level is below 16 (preserves free
pages).
According to the code, the check for the new dump level is done BEFORE
the new dump level is actually set (based on the dump level specified in
the command and the one from the input dump file).
Moving the new_dump_level calculation ahead would fix the error.

Signed-off-by: Mikhail Zaslonko <zaslonko at linux.vnet.ibm.com>
---
 makedumpfile.c | 34 ++++++++++++++++++++++------------
 1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/makedumpfile.c b/makedumpfile.c
index e69b6df..24f99fc 100644
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -9774,10 +9774,25 @@ writeout_multiple_dumpfiles(void)
 	return ret;
 }

+void
+update_dump_level(void)
+{
+	int new_level;
+
+	new_level = info->dump_level | info->kh_memory->dump_level;
+	if (new_level != info->dump_level) {
+		info->dump_level = new_level;
+		MSG("dump_level is changed to %d, " \
+			"because %s was created by dump_level(%d).",
+			new_level, info->name_memory,
+			info->kh_memory->dump_level);
+	}
+}
+
 int
 create_dumpfile(void)
 {
-	int num_retry, status, new_level;
+	int num_retry, status;

 	if (!open_files_for_creating_dumpfile())
 		return FALSE;
@@ -9786,6 +9801,10 @@ create_dumpfile(void)
 		if (!get_elf_info(info->fd_memory, info->name_memory))
 			return FALSE;
 	}
+
+	if (info->flag_refiltering)
+		update_dump_level();
+
 	if (!initial())
 		return FALSE;

@@ -9804,17 +9823,8 @@ create_dumpfile(void)

 	num_retry = 0;
 retry:
-	if (info->flag_refiltering) {
-		/* Change dump level */
-		new_level = info->dump_level | info->kh_memory->dump_level;
-		if (new_level != info->dump_level) {
-			info->dump_level = new_level;
-			MSG("dump_level is changed to %d, " \
-				"because %s was created by dump_level(%d).",
-				new_level, info->name_memory,
-				info->kh_memory->dump_level);
-		}
-	}
+	if (info->flag_refiltering)
+		update_dump_level();

 	if ((info->name_filterconfig || info->name_eppic_config)
 			&& !gather_filter_info())
-- 
1.8.3.1