[PATCH 4/5] x86/platform/uv: Add deprecated messages to /proc info leaves

[Mike Travis <mike.travis@xxxxxxx>]

Add "deprecated" message to any access to old /proc/sgi_uv/* leaves.

Signed-off-by: Mike Travis <mike.travis@xxxxxxx>
Reviewed-by: Steve Wahl <steve.wahl@xxxxxxx>
---
 arch/x86/kernel/apic/x2apic_uv_x.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 48746031b39a..bfd77a00c2a1 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -1615,21 +1615,45 @@ static void check_efi_reboot(void)
 		reboot_type = BOOT_ACPI;
 }
 
-/* Setup user proc fs files */
+/*
+ * User proc fs file handling now deprecated.
+ * Recommend using /sys/firmware/sgi_uv/... instead.
+ */
+static void proc_print_msg(int *flag, char *what, char *which)
+{
+	if (*flag)
+		return;
+
+	pr_notice(
+		"%s: using deprecated /proc/sgi_uv/%s, use /sys/firmware/sgi_uv/%s\n",
+		current->comm, what, which ? which : what);
+
+	*flag = 1;
+}
+
 static int __maybe_unused proc_hubbed_show(struct seq_file *file, void *data)
 {
+	static int flag;
+
+	proc_print_msg(&flag, "hubbed", "hub_type");
 	seq_printf(file, "0x%x\n", uv_hubbed_system);
 	return 0;
 }
 
 static int __maybe_unused proc_hubless_show(struct seq_file *file, void *data)
 {
+	static int flag;
+
+	proc_print_msg(&flag, "hubless", NULL);
 	seq_printf(file, "0x%x\n", uv_hubless_system);
 	return 0;
 }
 
 static int __maybe_unused proc_archtype_show(struct seq_file *file, void *data)
 {
+	static int flag;
+
+	proc_print_msg(&flag, "archtype", NULL);
 	seq_printf(file, "%s/%s\n", uv_archtype, oem_table_id);
 	return 0;
 }
-- 
2.21.0