On 07/08/2021 09:20, Cédric Le Goater wrote:
> On PowerVM, CPU-less nodes can be populated with hot-plugged CPUs at
> runtime. Today, the IPI is not created for such nodes, and hot-plugged
> CPUs use a bogus IPI, which leads to soft lockups.
>
> We can not directly allocate and request the IPI on
Hello Maxim Kochetkov,
The patch be7ecbd240b2: "soc: fsl: qe: convert QE interrupt
controller to platform_device" from Aug 3, 2021, leads to the
following static checker warning:
drivers/soc/fsl/qe/qe_ic.c:438 qe_ic_init()
warn: unsigned 'qe_ic->virq_low' is never less than zero.
On Sat, Aug 7, 2021 at 2:58 PM Christophe Leroy
wrote:
>
>
>
> Le 07/08/2021 à 03:02, sxwj...@me.com a écrit :
> > From: Xiongwei Song
> >
> > Create an anonymous union for dar and dear regsiters, we can reference
> > dear to get the effective address when CONFIG_4xx=y or CONFIG_BOOKE=y.
> >
On Sat, Aug 7, 2021 at 2:57 PM Christophe Leroy
wrote:
>
>
>
> Le 07/08/2021 à 03:02, sxwj...@me.com a écrit :
> > From: Xiongwei Song
> >
> > Create an anonymous union for dsisr and esr regsiters, we can reference
> > esr to get the exception detail when CONFIG_4xx=y or CONFIG_BOOKE=y.
> >
On 01/08/2021 08:38, Emmanuel Gil Peyrot wrote:
The OTP is a read-only memory area which contains various keys and
signatures used to decrypt, encrypt or verify various pieces of storage.
Its size depends on the console, it is 128 bytes on the Wii and
1024 bytes on the Wii U (split into
* Valentin Schneider [2021-08-09 13:52:38]:
> On 09/08/21 12:22, Srikar Dronamraju wrote:
> > * Valentin Schneider [2021-08-08 16:56:47]:
> >> Wait, doesn't the distance matrix (without any offline node) say
> >>
> >> distance(0, 3) == 40
> >>
> >> ? We should have at the very least:
> >>
>
* C?dric Le Goater [2021-08-07 09:20:57]:
> On PowerVM, CPU-less nodes can be populated with hot-plugged CPUs at
> runtime. Today, the IPI is not created for such nodes, and hot-plugged
> CPUs use a bogus IPI, which leads to soft lockups.
>
> We can not directly allocate and request the IPI on
On 8/7/21 9:20 AM, Cédric Le Goater wrote:
> On PowerVM, CPU-less nodes can be populated with hot-plugged CPUs at
> runtime. Today, the IPI is not created for such nodes, and hot-plugged
> CPUs use a bogus IPI, which leads to soft lockups.
>
> We can not directly allocate and request the IPI on
Create a separate function, sched_asym(). A subsequent changeset will
introduce logic to deal with SMT in conjunction with asmymmetric
packing. Such logic will need the statistics of the scheduling
group provided as argument. Update them before calling sched_asym().
Cc: Aubrey Li
Cc: Ben Segall
When scheduling, it is better to prefer a separate physical core rather
than the SMT sibling of a high priority core. The existing formula to
compute priorities takes such fact in consideration. There may exist,
however, combinations of priorities (i.e., maximum frequencies) in which
the priority
This is v4 the series. v1, v2, and v3 patches and test results can be found
in [1], [2], and [3], respectively.
=== Problem statement ===
++ Load balancing ++
When using asymmetric packing, there exists CPU topologies with three
priority levels in which only a subset of the physical cores
There exist situations in which the load balance needs to know the
properties of the CPUs in a scheduling group. When using asymmetric
packing, for instance, the load balancer needs to know not only the
state of dst_cpu but also of its SMT siblings, if any.
Use the flags of the child scheduling
Before deciding to pull tasks when using asymmetric packing of tasks,
on some architectures (e.g., x86) it is necessary to know not only the
state of dst_cpu but also of its SMT siblings. The decision to classify
a candidate busiest group as group_asym_packing is done in
update_sg_lb_stats(). Give
sched_asmy_prefer() always returns false when called on the local group. By
checking local_group, we can avoid additional checks and invoking
sched_asmy_prefer() when it is not needed. No functional changes are
introduced.
Cc: Aubrey Li
Cc: Ben Segall
Cc: Daniel Bristot de Oliveira
Cc: Dietmar
When deciding to pull tasks in ASYM_PACKING, it is necessary not only to
check for the idle state of the destination CPU, dst_cpu, but also of
its SMT siblings.
If dst_cpu is idle but its SMT siblings are busy, performance suffers
if it pulls tasks from a medium priority CPU that does not have
> I forgot to add that this version does break irqbalance anymore, since
... does not break ...
Sorry for the noise,
> Linux is not mapping interrupts of CPU-less nodes.
>
> Anyhow, irqbalance is now fixed :
>
>
>
-buildonly-randconfig-r001-20210810 (attached as .config)
compiler: powerpc-linux-gcc (GCC) 10.3.0
reproduce (this is a W=1 build):
wget
https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
chmod +x ~/bin/make.cross
#
https://git.kernel.org
On 8/10/21 1:45 PM, Kuppuswamy, Sathyanarayanan wrote:
>
>
> On 7/27/21 3:26 PM, Tom Lendacky wrote:
>> diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
>> index de01903c3735..cafed6456d45 100644
>> --- a/arch/x86/kernel/head64.c
>> +++ b/arch/x86/kernel/head64.c
>> @@ -19,7
On 7/27/21 3:26 PM, Tom Lendacky wrote:
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index de01903c3735..cafed6456d45 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -19,7 +19,7 @@
#include
#include
#include
-#include
+#include
#include
On 8/10/21 12:48 PM, Tom Lendacky wrote:
On 8/10/21 1:45 PM, Kuppuswamy, Sathyanarayanan wrote:
On 7/27/21 3:26 PM, Tom Lendacky wrote:
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index de01903c3735..cafed6456d45 100644
--- a/arch/x86/kernel/head64.c
+++
An interrupt handler shall not be called from another interrupt
handler otherwise this leads to problems like the following:
Kernel attempted to write user page (afd4fa84) - exploit attempt? (uid:
1000)
[ cut here ]
Bug: Write fault blocked by
single_step_exception() is called by emulate_single_step() which
is called from (at least) alignment exception() handler and
program_check_exception() handler.
Redefine it as a regular __single_step_exception() which is called
by both single_step_exception() handler and emulate_single_step()
Dear Linux folks,
Am 29.07.21 um 10:23 schrieb Paul Menzel:
I just wanted to make you aware that building Linux for ppc64le with
clang/lld.ld fails with [1]:
ld.lld: error: can't create dynamic relocation R_PPC64_ADDR64
against symbol: empty_zero_page in readonly segment; recompile
/202108110231.pw76zfp3-...@intel.com
Error/Warning in current branch:
arch/powerpc/kernel/misc_32.S:240: Error: unrecognized opcode: `emit_warn_entry'
Error/Warning ids grouped by kconfigs:
gcc_recent_errors
`-- powerpc64-buildonly-randconfig-r001-20210810
`-- arch-powerpc-kernel-misc_32
Ping, serious problem here. All booke ppc will trigger Oops when
perform kprobes related operations.
On 2021/8/9 10:36, Pu Lehui wrote:
When using kprobe on powerpc booke series processor, Oops happens
as show bellow:
/ # echo "p:myprobe do_nanosleep" > /sys/kernel/debug/tracing/kprobe_events
allyesconfig
powerpc allmodconfig
powerpc allnoconfig
x86_64 randconfig-a004-20210810
x86_64 randconfig-a006-20210810
x86_64 randconfig-a003-20210810
x86_64 randconfig-a005-20210810
x86_64
David Gibson writes:
> On Mon, Aug 09, 2021 at 10:54:33AM +0530, Aneesh Kumar K.V wrote:
>> PAPR interface currently supports two different ways of communicating
>> resource
>> grouping details to the OS. These are referred to as Form 0 and Form 1
>> associativity grouping. Form 0 is the older
/__WARN_FLAGS() with asm goto
config: powerpc64-buildonly-randconfig-r001-20210810 (attached as .config)
compiler: powerpc-linux-gcc (GCC) 10.3.0
reproduce (this is a W=1 build):
wget
https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
Le 11/08/2021 à 04:53, Pu Lehui a écrit :
Ping, serious problem here. All booke ppc will trigger Oops when
perform kprobes related operations.
As far as I can see it is in the fixes branch:
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/log/?h=fixes
On 2021/8/9
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