File kdump-Limit-kdump-cpus-to-number-provided-by-co... of Package kdump

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File kdump-Limit-kdump-cpus-to-number-provided-by-config.patch of Package kdump

From 4fc281692f5bef9a23c603a37e7a1bc30ee0a855 Mon Sep 17 00:00:00 2001
From: Ankit Kumar <ankit@linux.vnet.ibm.com>
Date: Thu, 10 Aug 2017 09:43:47 +0530
Subject: [PATCH] Limit kdump cpus to number provided by config

References: bsc#1036223, bsc#1068234
Patch-mainline: v0.8.17
Git-commit: 4fc281692f5bef9a23c603a37e7a1bc30ee0a855

Current piece of code doesn't verify number of kdump cpus provided in
config with number of online cpus and uses all online cpus as kdump cpus
even if KDUMP_CPUS are provided in the config.
Current code:
If online cpus = 5 and KDUMP_CPUS = 2 , then current piece of code
considers all online cpus as kdump cpus which is 5 but as KDUMP_CPUS
is provided as 2, we should restrict makedumpfile to use KDUMP_CPUS
which is 2 in this case.

In case of kdump, as we use maxcpus=1 and hence online cpus remains 1
but in case of fadump all cpus are online and even after providing
KDUMP_CPUS=1 in config, it consider all online cpus as kdump cpus.

This patch fixes above issue by verifying KDUMP_CPUS with online cpus.
If KDUMP_CPUS > online cpus then only use online cpus as kdump
cpus else use KDUMP_CPUS as dump cpus.

Signed-off-by: Ankit Kumar <ankit@linux.vnet.ibm.com>
---
 kdumptool/savedump.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kdumptool/savedump.cc b/kdumptool/savedump.cc
index a2fb1589d9db..ec66e63bd29b 100644
--- a/kdumptool/savedump.cc
+++ b/kdumptool/savedump.cc
@@ -286,9 +286,13 @@ void SaveDump::saveDump(const RootDirURLVector &urlv)
 	return;			// nothing to be done
 
     unsigned long cpus = config->KDUMP_CPUS.value();
+    unsigned long online_cpus = 0;
     if (cpus) {
         SystemCPU syscpu;
-        cpus = syscpu.numOnline();
+        online_cpus = syscpu.numOnline();
+        /* Limit kdump cpus to online cpus if (KDUMP_CPUS > online cpus) */
+        if (cpus > online_cpus)
+            cpus = online_cpus;
     }
     if (!config->kdumptoolContainsFlag("NOSPLIT") &&
         !config->kdumptoolContainsFlag("SINGLE") &&
-- 
2.13.6

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File kdump-Limit-kdump-cpus-to-number-provided-by-config.patch of Package kdump

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