>From 7c2d12934d74cb5e97a4c3083b38e79d597e9b31 Mon Sep 17 00:00:00 2001
From: Kevin D. Kissell <kevink@xxxxxxxxxxxxx>
Date: Tue, 9 Sep 2008 21:33:36 +0200
Subject: [PATCH] Fixed holes in SMTC and FPU affinity support.
Signed-off-by: Kevin D. Kissell <kevink@xxxxxxxxxxxxx>
---
arch/mips/kernel/process.c | 19 ++++++++++++-------
1 files changed, 12 insertions(+), 7 deletions(-)
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 2c09a44..75277c8 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -55,7 +55,7 @@ void __noreturn cpu_idle(void)
while (1) {
tick_nohz_stop_sched_tick();
while (!need_resched()) {
-#ifdef CONFIG_SMTC_IDLE_HOOK_DEBUG
+#ifdef CONFIG_MIPS_MT_SMTC
extern void smtc_idle_loop_hook(void);
smtc_idle_loop_hook();
@@ -155,14 +155,19 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
clear_tsk_thread_flag(p, TIF_USEDFPU);
#ifdef CONFIG_MIPS_MT_FPAFF
+ clear_tsk_thread_flag(p, TIF_FPUBOUND);
/*
- * FPU affinity support is cleaner if we track the
- * user-visible CPU affinity from the very beginning.
- * The generic cpus_allowed mask will already have
- * been copied from the parent before copy_thread
- * is invoked.
+ * FPU affinity support requires that we be subtle.
+ * The basic fork support code will have copied
+ * the parent's cpus_allowed set, but what the child
+ * needs to inherit is the "user" version, which
+ * carries the program/user controlled CPU affinity
+ * properties that are supposed to be inherited,
+ * but not the transient, overlayed, hardware
+ * affinity constraints.
*/
- p->thread.user_cpus_allowed = p->cpus_allowed;
+ p->thread.user_cpus_allowed = current->thread.user_cpus_allowed;
+ p->cpus_allowed = current->thread.user_cpus_allowed;
#endif /* CONFIG_MIPS_MT_FPAFF */
if (clone_flags & CLONE_SETTLS)
--
1.5.3.3
