From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 22 Aug 2008 06:22:23 +0000 (+0200)
Subject: x86: work around MTRR mask setting, v2
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9754a5b840a209bc1f192d59f63e81b698a55ac8;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

x86: work around MTRR mask setting, v2

improve the debug printout:

- make it actually display something
- print it only once

would be nice to have a WARN_ONCE() facility, to feed such things to
kerneloops.org.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 43102e03e2d1..cb7d3b6a80eb 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -401,7 +401,12 @@ static void generic_get_mtrr(unsigned int reg, unsigned long *base,
 		tmp |= ~((1<<(hi - 1)) - 1);
 
 		if (tmp != mask_lo) {
-			WARN_ON("mtrr: your BIOS has set up an incorrect mask, fixing it up.\n");
+			static int once = 1;
+
+			if (once) {
+				printk(KERN_INFO "mtrr: your BIOS has set up an incorrect mask, fixing it up.\n");
+				once = 0;
+			}
 			mask_lo = tmp;
 		}
 	}