> From: Peter Zijlstra [mailto:pet...@infradead.org]
> On Mon, Aug 31, 2015 at 08:53:11AM +, 河合英宏 / KAWAI，HIDEHIRO wrote:
> > > I understand your question. I don't intend to permit the recursive
> > > call of crash_kexec() as for 'old_cpu != this_cpu' check. That is
> > > needed for the case
On Mon, Aug 31, 2015 at 08:53:11AM +, 河合英宏 / KAWAI，HIDEHIRO wrote:
> > I understand your question. I don't intend to permit the recursive
> > call of crash_kexec() as for 'old_cpu != this_cpu' check. That is
> > needed for the case of panic() --> crash_kexec(). Since panic_cpu has
> >
Hello Peter,
> From: linux-kernel-ow...@vger.kernel.org
> [mailto:linux-kernel-ow...@vger.kernel.org] On Behalf Of 河合英宏 / KAWAI，
>
> Hi,
>
> > From: Peter Zijlstra [mailto:pet...@infradead.org]
> >
> > On Sat, Aug 22, 2015 at 02:35:24AM +, 河合英宏 / KAWAI，HIDEHIRO wrote:
> > > > From: Peter
> From: Peter Zijlstra [mailto:pet...@infradead.org]
> On Mon, Aug 31, 2015 at 08:53:11AM +, 河合英宏 / KAWAI，HIDEHIRO wrote:
> > > I understand your question. I don't intend to permit the recursive
> > > call of crash_kexec() as for 'old_cpu != this_cpu' check. That is
> > > needed for the case
On Mon, Aug 31, 2015 at 08:53:11AM +, 河合英宏 / KAWAI，HIDEHIRO wrote:
> > I understand your question. I don't intend to permit the recursive
> > call of crash_kexec() as for 'old_cpu != this_cpu' check. That is
> > needed for the case of panic() --> crash_kexec(). Since panic_cpu has
> >
Hello Peter,
> From: linux-kernel-ow...@vger.kernel.org
> [mailto:linux-kernel-ow...@vger.kernel.org] On Behalf Of 河合英宏 / KAWAI，
>
> Hi,
>
> > From: Peter Zijlstra [mailto:pet...@infradead.org]
> >
> > On Sat, Aug 22, 2015 at 02:35:24AM +, 河合英宏 / KAWAI，HIDEHIRO wrote:
> > > > From: Peter
Hi,
> From: Peter Zijlstra [mailto:pet...@infradead.org]
>
> On Sat, Aug 22, 2015 at 02:35:24AM +, 河合英宏 / KAWAI，HIDEHIRO wrote:
> > > From: Peter Zijlstra [mailto:pet...@infradead.org]
> > >
> > > On Thu, Aug 06, 2015 at 02:45:43PM +0900, Hidehiro Kawai wrote:
> > > > void
On Sat, Aug 22, 2015 at 02:35:24AM +, 河合英宏 / KAWAI，HIDEHIRO wrote:
> > From: Peter Zijlstra [mailto:pet...@infradead.org]
> >
> > On Thu, Aug 06, 2015 at 02:45:43PM +0900, Hidehiro Kawai wrote:
> > > void crash_kexec(struct pt_regs *regs)
> > > {
> > > + int old_cpu, this_cpu;
> > > +
> > >
On Sat, Aug 22, 2015 at 02:35:24AM +, 河合英宏 / KAWAI，HIDEHIRO wrote:
From: Peter Zijlstra [mailto:pet...@infradead.org]
On Thu, Aug 06, 2015 at 02:45:43PM +0900, Hidehiro Kawai wrote:
void crash_kexec(struct pt_regs *regs)
{
+ int old_cpu, this_cpu;
+
+ /*
+ *
Hi,
From: Peter Zijlstra [mailto:pet...@infradead.org]
On Sat, Aug 22, 2015 at 02:35:24AM +, 河合英宏 / KAWAI，HIDEHIRO wrote:
From: Peter Zijlstra [mailto:pet...@infradead.org]
On Thu, Aug 06, 2015 at 02:45:43PM +0900, Hidehiro Kawai wrote:
void crash_kexec(struct pt_regs *regs)
> From: Peter Zijlstra [mailto:pet...@infradead.org]
>
> On Thu, Aug 06, 2015 at 02:45:43PM +0900, Hidehiro Kawai wrote:
> > void crash_kexec(struct pt_regs *regs)
> > {
> > + int old_cpu, this_cpu;
> > +
> > + /*
> > +* `old_cpu == -1' means we are the first comer and crash_kexec()
> >
From: Peter Zijlstra [mailto:pet...@infradead.org]
On Thu, Aug 06, 2015 at 02:45:43PM +0900, Hidehiro Kawai wrote:
void crash_kexec(struct pt_regs *regs)
{
+ int old_cpu, this_cpu;
+
+ /*
+* `old_cpu == -1' means we are the first comer and crash_kexec()
+* was
On Thu, Aug 06, 2015 at 02:45:43PM +0900, Hidehiro Kawai wrote:
> void crash_kexec(struct pt_regs *regs)
> {
> + int old_cpu, this_cpu;
> +
> + /*
> + * `old_cpu == -1' means we are the first comer and crash_kexec()
> + * was called without entering panic().
> + * `old_cpu
On Thu, Aug 06, 2015 at 02:45:43PM +0900, Hidehiro Kawai wrote:
void crash_kexec(struct pt_regs *regs)
{
+ int old_cpu, this_cpu;
+
+ /*
+ * `old_cpu == -1' means we are the first comer and crash_kexec()
+ * was called without entering panic().
+ * `old_cpu ==
Currently, panic() and crash_kexec() can be called at the same time.
For example (x86 case):
CPU 0:
oops_end()
crash_kexec()
mutex_trylock() // acquired
nmi_shootdown_cpus() // stop other cpus
CPU 1:
panic()
crash_kexec()
mutex_trylock() // failed to acquire
Currently, panic() and crash_kexec() can be called at the same time.
For example (x86 case):
CPU 0:
oops_end()
crash_kexec()
mutex_trylock() // acquired
nmi_shootdown_cpus() // stop other cpus
CPU 1:
panic()
crash_kexec()
mutex_trylock() // failed to acquire
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