Kernel parameter 'nr_cpus' can be used to limit the maximum number
of processors that an SMP kernel could support. This patch extends
this to fadump by introducing 'fadump_nr_cpus' parameter that can
help in booting fadump kernel on a lower memory footprint.
Suggested-by: Mahesh Salgaonkar <mah...@linux.vnet.ibm.com>
Signed-off-by: Hari Bathini <hbath...@linux.vnet.ibm.com>
---
arch/powerpc/kernel/fadump.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index a7fef3e..c75783c 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -470,6 +470,28 @@ static int __init early_fadump_param(char *p)
}
early_param("fadump", early_fadump_param);
+/* Look for fadump_nr_cpus= cmdline option. */
+static int __init early_fadump_nrcpus(char *p)
+{
+ int nr_cpus;
+
+ /*
+ * fadump_nr_cpus parameter is only applicable on a
+ * fadump active kernel. This is to reduce memory
+ * needed to boot a fadump active kernel.
+ * So, check if we are booting after crash.
+ */
+ if (!is_fadump_active())
+ return 0;
+
+ get_option(&p, &nr_cpus);
+ if (nr_cpus > 0 && nr_cpus < nr_cpu_ids)
+ nr_cpu_ids = nr_cpus;
+
+ return 0;
+}
+early_param("fadump_nr_cpus", early_fadump_nrcpus);
+
static void register_fw_dump(struct fadump_mem_struct *fdm)
{
int rc;
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