From 64f2dde3f743c8a1ad8c0a1aa74166c1034afd92 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Wed, 29 Oct 2008 21:25:00 -0700 Subject: sparc64: Run the kernel always in the TSO memory model. The fact of the matter is, all UltraSPARC-III and later chips only implement TSO. They don't implement PSO and RMO memory models at all. Only the Ultra-I and Ultra-II family chips implement RMO and they are only helped marginally by using this setting when executing kernel code. The big plus to doing this is that we can eliminate all of the non-Sync memory barriers in the kernel except for the ones used in the optimized memcpy/memset code (these use block load and store operations which have their own memory ordering rules). Signed-off-by: David S. Miller --- arch/sparc64/kernel/etrap.S | 6 +++--- arch/sparc64/kernel/rtrap.S | 6 +++--- 2 files changed, 6 insertions(+), 6 deletions(-) (limited to 'arch/sparc64') diff --git a/arch/sparc64/kernel/etrap.S b/arch/sparc64/kernel/etrap.S index 29ce489bc18..786b185e6e3 100644 --- a/arch/sparc64/kernel/etrap.S +++ b/arch/sparc64/kernel/etrap.S @@ -16,9 +16,9 @@ #include #define TASK_REGOFF (THREAD_SIZE-TRACEREG_SZ-STACKFRAME_SZ) -#define ETRAP_PSTATE1 (PSTATE_RMO | PSTATE_PRIV) +#define ETRAP_PSTATE1 (PSTATE_TSO | PSTATE_PRIV) #define ETRAP_PSTATE2 \ - (PSTATE_RMO | PSTATE_PEF | PSTATE_PRIV | PSTATE_IE) + (PSTATE_TSO | PSTATE_PEF | PSTATE_PRIV | PSTATE_IE) /* * On entry, %g7 is return address - 0x4. @@ -130,7 +130,7 @@ etrap_save: save %g2, -STACK_BIAS, %sp stx %g6, [%sp + PTREGS_OFF + PT_V9_G6] stx %g7, [%sp + PTREGS_OFF + PT_V9_G7] or %l7, %l0, %l7 - sethi %hi(TSTATE_RMO | TSTATE_PEF), %l0 + sethi %hi(TSTATE_TSO | TSTATE_PEF), %l0 or %l7, %l0, %l7 wrpr %l2, %tnpc wrpr %l7, (TSTATE_PRIV | TSTATE_IE), %tstate diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S index 97a993c1f7f..6892cf556f4 100644 --- a/arch/sparc64/kernel/rtrap.S +++ b/arch/sparc64/kernel/rtrap.S @@ -14,9 +14,9 @@ #include #include -#define RTRAP_PSTATE (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE) -#define RTRAP_PSTATE_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV) -#define RTRAP_PSTATE_AG_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG) +#define RTRAP_PSTATE (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE) +#define RTRAP_PSTATE_IRQOFF (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV) +#define RTRAP_PSTATE_AG_IRQOFF (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG) .text .align 32 -- cgit v1.2.3