Patch "x86/cpu: Change type of x86_cache_size variable to unsigned int" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

x86/cpu: Change type of x86_cache_size variable to unsigned int

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
x86-cpu-change-type-of-x86_cache_size-variable-to-unsigned-int.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: "Gustavo A. R. Silva" <[email protected]>
Date: Tue, 13 Feb 2018 13:22:08 -0600
Subject: x86/cpu: Change type of x86_cache_size variable to unsigned int

From: Gustavo A. R. Silva <[email protected]>

commit 24dbc6000f4b9b0ef5a9daecb161f1907733765a upstream.

Currently, x86_cache_size is of type int, which makes no sense as we will never have a valid cache size equal or less than 0. So instead of initializing this variable to -1, it can perfectly be initialized to 0 and use it as an unsigned variable instead.

Addresses-Coverity-ID: 1464429

---
 arch/x86/include/asm/processor.h      |    2 +-
 arch/x86/kernel/cpu/common.c          |    2 +-
 arch/x86/kernel/cpu/microcode/intel.c |    2 +-
 arch/x86/kernel/cpu/proc.c            |    4 ++--
 4 files changed, 5 insertions(+), 5 deletions(-)

@@ -113,7 +113,7 @@ struct cpuinfo_x86 {
 	char			x86_vendor_id[16];
 	char			x86_model_id[64];
 	/* in KB - valid for CPUS which support this call: */
-	int			x86_cache_size;
+	unsigned int		x86_cache_size;
 	int			x86_cache_alignment;	/* In bytes */
 	/* Cache QoS architectural values: */
 	int			x86_cache_max_rmid;	/* max index */

@@ -1144,7 +1144,7 @@ static void identify_cpu(struct cpuinfo_
 	int i;
 
 	c->loops_per_jiffy = loops_per_jiffy;
-	c->x86_cache_size = -1;
+	c->x86_cache_size = 0;
 	c->x86_vendor = X86_VENDOR_UNKNOWN;
 	c->x86_model = c->x86_stepping = 0;	/* So far unknown... */
 	c->x86_vendor_id[0] = '\0'; /* Unset */

@@ -1132,7 +1132,7 @@ static struct microcode_ops microcode_in
 
 static int __init calc_llc_size_per_core(struct cpuinfo_x86 *c)
 {
-	u64 llc_size = c->x86_cache_size * 1024;
+	u64 llc_size = c->x86_cache_size * 1024ULL;
 
 	do_div(llc_size, c->x86_max_cores);
 

@@ -87,8 +87,8 @@ static int show_cpuinfo(struct seq_file
 	}
 
 	/* Cache size */
-	if (c->x86_cache_size >= 0)
-		seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
+	if (c->x86_cache_size)
+		seq_printf(m, "cache size\t: %u KB\n", c->x86_cache_size);
 
 	show_cpuinfo_core(m, c, cpu);
 	show_cpuinfo_misc(m, c);

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/x86-cpu-change-type-of-x86_cache_size-variable-to-unsigned-int.patch