[PATCH -tip] x86: cpu_debug.c prepare report if files are less or more then expected

[Jaswinder Singh Rajput <jaswinder@kernel.org>]

This will prepare the report to update cpu_debug

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
---
 arch/x86/include/asm/cpu_debug.h |    1 +
 arch/x86/kernel/cpu/cpu_debug.c  |   12 ++++++++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/cpu_debug.h b/arch/x86/include/asm/cpu_debug.h
index 2228020..b64da5d 100644
--- a/arch/x86/include/asm/cpu_debug.h
+++ b/arch/x86/include/asm/cpu_debug.h
@@ -187,6 +187,7 @@ enum cpu_processor_bit {
 #define	CPU_ALL			(CPU_INTEL_ALL | CPU_AMD_ALL)
 
 #define MAX_CPU_FILES		512
+#define MIN_CPU_FILES		10
 
 struct cpu_private {
 	unsigned		cpu;
diff --git a/arch/x86/kernel/cpu/cpu_debug.c b/arch/x86/kernel/cpu/cpu_debug.c
index 46e29ab..1c3ebd4 100644
--- a/arch/x86/kernel/cpu/cpu_debug.c
+++ b/arch/x86/kernel/cpu/cpu_debug.c
@@ -838,6 +838,14 @@ static int cpu_init_allreg(unsigned cpu, struct dentry *dentry)
 	return err;
 }
 
+/* Send Report to maintainer if files are less or more then expected */ 
+static void send_report(int files, struct cpuinfo_x86 *cpui)
+{
+	pr_info("Please report \"cpu_debug files %d for %x:%x:%x:%x\" to"
+		" jaswinderrajput@gmail.com\n", files, cpui->x86_vendor,
+		cpui->x86, cpui->x86_model, cpui->x86_mask);
+}
+
 static int cpu_init_cpu(void)
 {
 	struct dentry *cpu_dentry = NULL;
@@ -861,9 +869,13 @@ static int cpu_init_cpu(void)
 
 		pr_info("cpu%d(%d) debug files %d\n",
 			cpu, nr_cpu_ids, per_cpu(cpu_priv_count, cpu));
+		if ((per_cpu(cpu_priv_count, cpu) < MIN_CPU_FILES) && !cpu)
+			send_report(per_cpu(cpu_priv_count, cpu), cpui);
+
 		if (per_cpu(cpu_priv_count, cpu) > MAX_CPU_FILES) {
 			pr_err("Register files count %d exceeds limit %d\n",
 				per_cpu(cpu_priv_count, cpu), MAX_CPU_FILES);
+			send_report(per_cpu(cpu_priv_count, cpu), cpui);
 			per_cpu(cpu_priv_count, cpu) = MAX_CPU_FILES;
 			err = -ENFILE;
 		}
-- 
1.6.0.6