From: Linus Torvalds <torvalds@woody.linux-foundation.org>
Date: Thu, 31 May 2007 14:55:16 +0000 (-0700)
Subject: smpboot: fix cachesize comparison in smp_tune_scheduling()
X-Git-Tag: firefly_0821_release~28854
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8387c1a46376b8cfc5f4751b27a6c90f930992cf;p=firefly-linux-kernel-4.4.55.git

smpboot: fix cachesize comparison in smp_tune_scheduling()

Jarek Poplawski noted that boot_cpu_data.x86_cache_size is signed int
and can be < 0 too.

In fact we test for it. Except we assigned it to an unsigned value..

Cc: Jarek Poplawski <jarkao2@o2.pl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andi Kleen <ak@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index 08f07a74a9d3..88baed1e7e83 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -943,10 +943,9 @@ exit:
 
 static void smp_tune_scheduling(void)
 {
-	unsigned long cachesize;       /* kB   */
-
 	if (cpu_khz) {
-		cachesize = boot_cpu_data.x86_cache_size;
+		/* cache size in kB */
+		long cachesize = boot_cpu_data.x86_cache_size;
 
 		if (cachesize > 0)
 			max_cache_size = cachesize * 1024;