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Message-ID: <20130627200038.29830.83910.stgit@srivatsabhat.in.ibm.com>
Date: Fri, 28 Jun 2013 01:30:38 +0530
From: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To: tglx@...utronix.de, peterz@...radead.org, tj@...nel.org,
oleg@...hat.com, paulmck@...ux.vnet.ibm.com, rusty@...tcorp.com.au,
mingo@...nel.org, akpm@...ux-foundation.org, namhyung@...nel.org,
walken@...gle.com, vincent.guittot@...aro.org,
laijs@...fujitsu.com, David.Laight@...lab.com
Cc: rostedt@...dmis.org, wangyun@...ux.vnet.ibm.com,
xiaoguangrong@...ux.vnet.ibm.com, sbw@....edu, fweisbec@...il.com,
zhong@...ux.vnet.ibm.com, nikunj@...ux.vnet.ibm.com,
srivatsa.bhat@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
Paul Mundt <lethal@...ux-sh.org>,
Thomas Gleixner <tglx@...utronix.de>, linux-sh@...r.kernel.org,
"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: [PATCH v3 43/45] sh: Use get/put_online_cpus_atomic() to prevent CPU
offline
Once stop_machine() is gone from the CPU offline path, we won't be able
to depend on disabling preemption to prevent CPUs from going offline
from under us.
Use the get/put_online_cpus_atomic() APIs to prevent CPUs from going
offline, while invoking from atomic context.
Cc: Paul Mundt <lethal@...ux-sh.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-sh@...r.kernel.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---
arch/sh/kernel/smp.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c
index 4569645..42ec182 100644
--- a/arch/sh/kernel/smp.c
+++ b/arch/sh/kernel/smp.c
@@ -357,7 +357,7 @@ static void flush_tlb_mm_ipi(void *mm)
*/
void flush_tlb_mm(struct mm_struct *mm)
{
- preempt_disable();
+ get_online_cpus_atomic();
if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1);
@@ -369,7 +369,7 @@ void flush_tlb_mm(struct mm_struct *mm)
}
local_flush_tlb_mm(mm);
- preempt_enable();
+ put_online_cpus_atomic();
}
struct flush_tlb_data {
@@ -390,7 +390,7 @@ void flush_tlb_range(struct vm_area_struct *vma,
{
struct mm_struct *mm = vma->vm_mm;
- preempt_disable();
+ get_online_cpus_atomic();
if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
struct flush_tlb_data fd;
@@ -405,7 +405,7 @@ void flush_tlb_range(struct vm_area_struct *vma,
cpu_context(i, mm) = 0;
}
local_flush_tlb_range(vma, start, end);
- preempt_enable();
+ put_online_cpus_atomic();
}
static void flush_tlb_kernel_range_ipi(void *info)
@@ -433,7 +433,7 @@ static void flush_tlb_page_ipi(void *info)
void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
{
- preempt_disable();
+ get_online_cpus_atomic();
if ((atomic_read(&vma->vm_mm->mm_users) != 1) ||
(current->mm != vma->vm_mm)) {
struct flush_tlb_data fd;
@@ -448,7 +448,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
cpu_context(i, vma->vm_mm) = 0;
}
local_flush_tlb_page(vma, page);
- preempt_enable();
+ put_online_cpus_atomic();
}
static void flush_tlb_one_ipi(void *info)
--
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