On 01/20/22 at 06:36pm, Guilherme G. Piccoli wrote:
> Hi Baoquan, some comments inline below:
>
>
> On 20/01/2022 05:51, Baoquan He wrote:
> > [...]
> >> From my POV, the function of panic notifiers is not well defined. They
> >> do various things, for example:
> >> [...]
> >> The do more that ju
On Fri, Jan 21, 2022 at 2:09 AM Philipp Rudo wrote:
>
> Hi Pingfan,
>
> On Tue, 18 Jan 2022 15:48:09 +0800
> Pingfan Liu wrote:
>
> > After kernel commit 7bc1a0f9e176 ("arm64: mm: use single quantity to
> > represent the PA to VA translation"), phys_offset can be negative if
> > running 52-bits k
On Fri, Jan 21, 2022 at 2:09 AM Philipp Rudo wrote:
>
> Hi Pingfan,
>
> On Tue, 18 Jan 2022 15:48:12 +0800
> Pingfan Liu wrote:
>
> > From: Kairui Song
> >
> > Since kernel commit 14c127c957c1 ('arm64: mm: Flip kernel VA space'),
> > the memory layout on arm64 have changed, and kexec-tools can n
Hi Baoquan, some comments inline below:
On 20/01/2022 05:51, Baoquan He wrote:
> [...]
>> From my POV, the function of panic notifiers is not well defined. They
>> do various things, for example:
>> [...]
>> The do more that just providing information. Some are risky. It is not
>> easy to disable
Hi Pingfan,
On Tue, 18 Jan 2022 15:48:09 +0800
Pingfan Liu wrote:
> After kernel commit 7bc1a0f9e176 ("arm64: mm: use single quantity to
> represent the PA to VA translation"), phys_offset can be negative if
> running 52-bits kernel on 48-bits hardware.
>
> So changing phys_offset from unsigned
Hi Pingfan,
On Tue, 18 Jan 2022 15:48:10 +0800
Pingfan Liu wrote:
> There are two funcs to get page_offset:
> get_kernel_page_offset()
> get_page_offset()
>
> Since get_kernel_page_offset() does not observe the kernel formula, and
> remove it. Unify them in order to introduce 52-bits VA ker
Hi Pingfan,
On Tue, 18 Jan 2022 15:48:11 +0800
Pingfan Liu wrote:
> phys_to_virt() calculates virtual address. As a important factor,
> page_offset is excepted to be accurate.
>
> Since arm64 kernel exposes va_bits through vmcore, using it.
>
> Signed-off-by: Pingfan Liu
> Cc: Kairui Song
>
Hi Pingfan,
On Tue, 18 Jan 2022 15:48:12 +0800
Pingfan Liu wrote:
> From: Kairui Song
>
> Since kernel commit 14c127c957c1 ('arm64: mm: Flip kernel VA space'),
> the memory layout on arm64 have changed, and kexec-tools can no longer
> get the the right PAGE_OFFSET based on _text symbol.
>
> P
On 20/01/2022 06:39, Petr Mladek wrote:
> [...]
> It makes perfect sense to disable the watchdogs during panic().
> For example, rcu_panic() just sets a variable:
>
> static int rcu_panic(struct notifier_block *this, unsigned long ev, void *ptr)
> {
> rcu_cpu_stall_suppress = 1;
> retu
Adding some more people into Cc. Some modified the logic in the past.
Some are familiar with some interesting areas where the panic
notfiers are used.
On Sat 2022-01-08 12:34:51, Guilherme G. Piccoli wrote:
> The kernel notifier infrastructure allows function callbacks to be
> added in multiple li
On 12/07/21 at 12:05am, Jisheng Zhang wrote:
> Replace the conditional compilation using "#ifdef CONFIG_KEXEC_CORE"
> by a check for "IS_ENABLED(CONFIG_KEXEC_CORE)", to simplify the code
> and increase compile coverage.
Only checked the x86 patch, but the whole patchset looks good to me,
thanks, J
On 01/19/22 at 07:44pm, Jisheng Zhang wrote:
> On Wed, Jan 19, 2022 at 05:33:22PM +0800, Baoquan He wrote:
> > On 01/19/22 at 09:52am, Alexandre Ghiti wrote:
> > > Hi Baoquan,
> > >
> > > On Wed, Jan 19, 2022 at 9:11 AM Baoquan He wrote:
> > > >
> > > > On 01/18/22 at 10:13pm, Jisheng Zhang wrote
On Wed 2022-01-19 13:03:15, Guilherme G. Piccoli wrote:
> Thanks again Petr, for the deep analysis! Much appreciated.
> Some comments inline below:
>
>
> On 19/01/2022 12:48, Petr Mladek wrote:
> >[...]
> > From my POV, the function of panic notifiers is not well defined. They
> > do various thin
On 01/19/22 at 04:48pm, Petr Mladek wrote:
> On Wed 2022-01-19 15:13:18, Baoquan He wrote:
> > On 01/14/22 at 03:30pm, Guilherme G. Piccoli wrote:
> > > The panic_print setting allows users to collect more information in a
> > > panic event, like memory stats, tasks, CPUs backtraces, etc.
> > > Thi
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