[PATCH] MIPS: VR4133: add LL/SC support

[PATCH] MIPS: VR4133: add LL/SC support

[Yoichi Yuasa]

Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org>
---
 arch/mips/kernel/cpu-probe.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 9f31334..44c5aad 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -547,6 +547,9 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
 		c->tlbsize = 48;
 		break;
 	case PRID_IMP_VR41XX:
+		c->isa_level = MIPS_CPU_ISA_III;
+		c->options = R4K_OPTS;
+		c->tlbsize = 32;
 		switch (c->processor_id & 0xf0) {
 		case PRID_REV_VR4111:
 			c->cputype = CPU_VR4111;
@@ -571,6 +574,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
 				__cpu_name[cpu] = "NEC VR4131";
 			} else {
 				c->cputype = CPU_VR4133;
+				c->options |= MIPS_CPU_LLSC;
 				__cpu_name[cpu] = "NEC VR4133";
 			}
 			break;
@@ -580,9 +584,6 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
 			__cpu_name[cpu] = "NEC Vr41xx";
 			break;
 		}
-		c->isa_level = MIPS_CPU_ISA_III;
-		c->options = R4K_OPTS;
-		c->tlbsize = 32;
 		break;
 	case PRID_IMP_R4300:
 		c->cputype = CPU_R4300;
-- 
1.7.9.5

Re: [PATCH] MIPS: VR4133: add LL/SC support

[Ralf Baechle]

On Thu, Feb 21, 2013 at 03:38:19PM +0900, Yoichi Yuasa wrote:

Patch is looking good, applied.  Thanks, Yoichi-San!

I noticed that there's no <asm/mach-vr41xx/cpu-feature-overrides.h> file,
so all CPU features will always be runtime tested.  This is going to be
rather slow and bloated.  You could also use this to specifically define
cpu_has_llsc to 0/1 for those platforms that are known to have not have/
have ll/sc instructions.

  Ralf