[tip:x86/cache] x86/intel_rdt: Implement show_options() for resctrlfs

[tip-bot for Shaohua Li <tipbot@zytor.com>]

Commit-ID:  76ae054c69a745ded388fc4ae70422d74c5bc77d
Gitweb:     http://git.kernel.org/tip/76ae054c69a745ded388fc4ae70422d74c5bc77d
Author:     Shaohua Li <shli@fb.com>
AuthorDate: Fri, 2 Dec 2016 14:21:06 -0800
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Fri, 9 Dec 2016 14:12:18 +0100

x86/intel_rdt: Implement show_options() for resctrlfs

Implement show_options() callback for intel resource control filesystem
to expose the active mount options in /proc/

Signed-off-by: Shaohua Li <shli@fb.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/7dce7c1886ac9289442d254ea18322c92bd968da.1480717072.git.shli@fb.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
 arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index 1afd3f3..8af04af 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -1036,9 +1036,17 @@ out:
 	return ret;
 }
 
+static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
+{
+	if (rdt_resources_all[RDT_RESOURCE_L3DATA].enabled)
+		seq_puts(seq, ",cdp");
+	return 0;
+}
+
 static struct kernfs_syscall_ops rdtgroup_kf_syscall_ops = {
-	.mkdir	= rdtgroup_mkdir,
-	.rmdir	= rdtgroup_rmdir,
+	.mkdir		= rdtgroup_mkdir,
+	.rmdir		= rdtgroup_rmdir,
+	.show_options	= rdtgroup_show_options,
 };
 
 static int __init rdtgroup_setup_root(void)