From e545a6140b698b2494daf0b32107bdcc5e901390 Mon Sep 17 00:00:00 2001 From: Manfred Spraul Date: Sun, 7 Sep 2008 16:57:22 +0200 Subject: kernel/cpu.c: create a CPU_STARTING cpu_chain notifier Right now, there is no notifier that is called on a new cpu, before the new cpu begins processing interrupts/softirqs. Various kernel function would need that notification, e.g. kvm works around by calling smp_call_function_single(), rcu polls cpu_online_map. The patch adds a CPU_STARTING notification. It also adds a helper function that sends the message to all cpu_chain handlers. Tested on x86-64. All other archs are untested. Especially on sparc, I'm not sure if I got it right. Signed-off-by: Manfred Spraul Signed-off-by: Ingo Molnar --- arch/sparc/kernel/sun4m_smp.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/sparc/kernel/sun4m_smp.c') diff --git a/arch/sparc/kernel/sun4m_smp.c b/arch/sparc/kernel/sun4m_smp.c index a14a76ac7f3..9964890dc1d 100644 --- a/arch/sparc/kernel/sun4m_smp.c +++ b/arch/sparc/kernel/sun4m_smp.c @@ -71,6 +71,8 @@ void __cpuinit smp4m_callin(void) local_flush_cache_all(); local_flush_tlb_all(); + notify_cpu_starting(cpuid); + /* Get our local ticker going. */ smp_setup_percpu_timer(); -- cgit v1.2.3 From 1de937a536ea1a132d22dc198a9e07d208d40a29 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Sat, 13 Sep 2008 22:07:56 -0700 Subject: sparc32: Call sun4m_clear_profile_irq() directly from sun4m_smp.c This is the only use of the clear_profile_irq() btfixup entry, which just eats up lots of dead space on other platform types. A subsequent commit will delete the other implementations and the btfixup entry as well. Signed-off-by: David S. Miller --- arch/sparc/kernel/sun4m_smp.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'arch/sparc/kernel/sun4m_smp.c') diff --git a/arch/sparc/kernel/sun4m_smp.c b/arch/sparc/kernel/sun4m_smp.c index a14a76ac7f3..e3c0be17729 100644 --- a/arch/sparc/kernel/sun4m_smp.c +++ b/arch/sparc/kernel/sun4m_smp.c @@ -313,6 +313,8 @@ void smp4m_cross_call_irq(void) ccall_info.processors_out[i] = 1; } +extern void sun4m_clear_profile_irq(int cpu); + void smp4m_percpu_timer_interrupt(struct pt_regs *regs) { struct pt_regs *old_regs; @@ -320,7 +322,7 @@ void smp4m_percpu_timer_interrupt(struct pt_regs *regs) old_regs = set_irq_regs(regs); - clear_profile_irq(cpu); + sun4m_clear_profile_irq(cpu); profile_tick(CPU_PROFILING); -- cgit v1.2.3 From 4245e59d1239a5270670807b114856365a863df8 Mon Sep 17 00:00:00 2001 From: Robert Reif Date: Sun, 12 Oct 2008 20:52:26 -0700 Subject: sparc32: fix build errors MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit arch/sparc/kernel/sun4d_smp.c: In function ‘smp4d_callin’: arch/sparc/kernel/sun4d_smp.c:101: error: implicit declaration of function ‘notify_cpu_starting’ arch/sparc/kernel/sun4m_smp.c: In function ‘smp4m_callin’: arch/sparc/kernel/sun4m_smp.c:74: error: implicit declaration of function ‘notify_cpu_starting’ Signed-off-by: Robert Reif Signed-off-by: David S. Miller --- arch/sparc/kernel/sun4m_smp.c | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/sparc/kernel/sun4m_smp.c') diff --git a/arch/sparc/kernel/sun4m_smp.c b/arch/sparc/kernel/sun4m_smp.c index 0c564ba9e70..5fc386d08c4 100644 --- a/arch/sparc/kernel/sun4m_smp.c +++ b/arch/sparc/kernel/sun4m_smp.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include -- cgit v1.2.3