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microblaze: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW usage 

As far as I can tell the only reason microblaze has
__ARCH_WANT_INTERRUPTS_ON_CTXSW is because it initializes new task state
with interrupts enabled so that on switch_to() interrupts get enabled.

So change copy_thread() to clear MSR_IE instead of set it, this will
ensure switch_to() will always keep IRQs disabled.

The scheduler will disable IRQs when taking rq->lock in schedule() and
enable IRQs in finish_lock_switch() after its done its magic.

This leaves ARM the only __ARCH_WANT_INTERRUPTS_ON_CTXSW user.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Peter Zijlstra 2011-08-24 15:32:31 +02:00 committed by Michal Simek
parent cb5edfe3e5
commit 84ac218f02
2 changed files with 1 additions and 2 deletions
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2
arch/microblaze/include/asm/system.h
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@ -17,8 +17,6 @@
#include <asm-generic/cmpxchg.h> #include <asm-generic/cmpxchg.h>
#include <asm-generic/cmpxchg-local.h> #include <asm-generic/cmpxchg-local.h>
#define __ARCH_WANT_INTERRUPTS_ON_CTXSW
struct task_struct; struct task_struct;
struct thread_info; struct thread_info;

1
arch/microblaze/kernel/process.c
View File

@ -179,6 +179,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
ti->cpu_context.msr = (childregs->msr|MSR_VM); ti->cpu_context.msr = (childregs->msr|MSR_VM);
ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */ ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */
ti->cpu_context.msr &= ~MSR_IE;
#endif #endif
ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8; ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8;