* [PATCH] MIPS: SGI-IP28: disable use of ll/sc in kernel
@ 2020-10-07 10:17 Thomas Bogendoerfer
2020-10-08 9:19 ` Thomas Bogendoerfer
0 siblings, 1 reply; 2+ messages in thread
From: Thomas Bogendoerfer @ 2020-10-07 10:17 UTC (permalink / raw)
To: linux-mips, linux-kernel
SGI-IP28 systems only use broken R10k rev 2.5 CPUs, which could lock
up, if ll/sc sequences are issued in certain order. Since those systems
are all non-SMP, we can disable ll/sc usage in kernel.
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
arch/mips/include/asm/mach-ip28/cpu-feature-overrides.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/mips/include/asm/mach-ip28/cpu-feature-overrides.h b/arch/mips/include/asm/mach-ip28/cpu-feature-overrides.h
index ba8b4e30b3e2..613bbc10c1f2 100644
--- a/arch/mips/include/asm/mach-ip28/cpu-feature-overrides.h
+++ b/arch/mips/include/asm/mach-ip28/cpu-feature-overrides.h
@@ -25,7 +25,7 @@
#define cpu_has_mcheck 0
#define cpu_has_ejtag 0
-#define cpu_has_llsc 1
+#define cpu_has_llsc 0
#define cpu_has_vtag_icache 0
#define cpu_has_dc_aliases 0 /* see probe_pcache() */
#define cpu_has_ic_fills_f_dc 0
--
2.16.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] MIPS: SGI-IP28: disable use of ll/sc in kernel
2020-10-07 10:17 [PATCH] MIPS: SGI-IP28: disable use of ll/sc in kernel Thomas Bogendoerfer
@ 2020-10-08 9:19 ` Thomas Bogendoerfer
0 siblings, 0 replies; 2+ messages in thread
From: Thomas Bogendoerfer @ 2020-10-08 9:19 UTC (permalink / raw)
To: linux-mips, linux-kernel
On Wed, Oct 07, 2020 at 12:17:04PM +0200, Thomas Bogendoerfer wrote:
> SGI-IP28 systems only use broken R10k rev 2.5 CPUs, which could lock
> up, if ll/sc sequences are issued in certain order. Since those systems
> are all non-SMP, we can disable ll/sc usage in kernel.
>
> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> ---
> arch/mips/include/asm/mach-ip28/cpu-feature-overrides.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
applied to mips-next.
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
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