Hi, Miroslav!
>
> Perhaps something like
>
> "
> Add "stack_order" sysfs attribute which holds the order in which a live
> patch module was loaded into the system. A user can then determine an
> active live patched version of a function.
>
> cat /sys/kernel/livepatch/livepatch_1/stack_order ->
2024年9月29日 07:55，Boqun Feng wrote：
>
>
>
> On Sun, Sep 29, 2024, at 6:26 AM, Alan Huang wrote:
>> 2024年9月28日 23:55，Mathieu Desnoyers wrote：
>>>
>>> On 2024-09-28 17:49, Alan Stern wrote:
On Sat, Sep 28, 2024 at 11:32:18AM -0400, Mathieu Desnoyers wrote:
> On 2024-09-28 16:49, Alan St
On Sun, Sep 29, 2024, at 6:26 AM, Alan Huang wrote:
> 2024年9月28日 23:55，Mathieu Desnoyers wrote：
>>
>> On 2024-09-28 17:49, Alan Stern wrote:
>>> On Sat, Sep 28, 2024 at 11:32:18AM -0400, Mathieu Desnoyers wrote:
On 2024-09-28 16:49, Alan Stern wrote:
> On Sat, Sep 28, 2024 at 09:51:27
Cc: Nikita Popov
Cc: l...@lists.linux.dev
On Sat, 28 Sep 2024 09:51:27 -0400
Mathieu Desnoyers wrote:
> Compiler CSE and SSA GVN optimizations can cause the address dependency
> of addresses returned by rcu_dereference to be lost when comparing those
> pointers with either constants or previous
2024年9月29日 06:10，Alan Huang wrote：
>
> 2024年9月28日 06:18，Jonas Oberhauser wrote：
>>
>>
>>
>> Am 9/27/2024 um 10:10 PM schrieb Mathieu Desnoyers:
>>> On 2024-09-27 21:23, Jonas Oberhauser wrote:
>>> [...]
That idea seems to be confirmed by this (atrocious, not to be copied!)
example:
2024年9月28日 23:55，Mathieu Desnoyers wrote：
>
> On 2024-09-28 17:49, Alan Stern wrote:
>> On Sat, Sep 28, 2024 at 11:32:18AM -0400, Mathieu Desnoyers wrote:
>>> On 2024-09-28 16:49, Alan Stern wrote:
On Sat, Sep 28, 2024 at 09:51:27AM -0400, Mathieu Desnoyers wrote:
> equality, which does
2024年9月28日 06:18，Jonas Oberhauser wrote：
>
>
>
> Am 9/27/2024 um 10:10 PM schrieb Mathieu Desnoyers:
>> On 2024-09-27 21:23, Jonas Oberhauser wrote:
>> [...]
>>> That idea seems to be confirmed by this (atrocious, not to be copied!)
>>> example:
>>>
>>> int fct_escape_address_of_b(void)
>>> {
On Fri, Sep 27, 2024 at 10:45:58AM -0500, Eric W. Biederman wrote:
> Tycho Andersen writes:
>
> > From: Tycho Andersen
> >
> > Zbigniew mentioned at Linux Plumber's that systemd is interested in
> > switching to execveat() for service execution, but can't, because the
> > contents of /proc/pid/c
On Mon, Sep 23, 2024 at 2:19 PM Sami Tolvanen wrote:
>
> Hi,
>
> Here's v3 of the DWARF modversions series [1][2]. The main
> motivation remains modversions support for Rust, which is important
> for distributions like Android that are eager to ship Rust kernel
> modules. Per Luis' request [3], v2
On Wed, Sep 25, 2024 at 7:39 PM Matthew Maurer wrote:
>
> This patch series is intended for use alongside the Implement
> MODVERSIONS for RUST [1] series as a replacement for the symbol name
> hashing approach used there to enable RUST and MODVERSIONS at the same
> time.
>
> Elsewhere, we've seen
On 9/28/24 12:27, Shuah Khan wrote:
On 9/28/24 11:54, Shuah Khan wrote:
On 9/28/24 11:31, Guenter Roeck wrote:
On 9/27/24 17:08, Guenter Roeck wrote:
On 9/27/24 13:45, Shuah Khan wrote:
On 9/27/24 10:19, Guenter Roeck wrote:
Copying devicetree maintainers.
On Thu, Sep 26, 2024 at 09:39:38PM
On Sat, Sep 28, 2024 at 11:55:22AM -0400, Mathieu Desnoyers wrote:
> On 2024-09-28 17:49, Alan Stern wrote:
> > On Sat, Sep 28, 2024 at 11:32:18AM -0400, Mathieu Desnoyers wrote:
> > > On 2024-09-28 16:49, Alan Stern wrote:
> > > > On Sat, Sep 28, 2024 at 09:51:27AM -0400, Mathieu Desnoyers wrote:
On 9/28/24 11:54, Shuah Khan wrote:
On 9/28/24 11:31, Guenter Roeck wrote:
On 9/27/24 17:08, Guenter Roeck wrote:
On 9/27/24 13:45, Shuah Khan wrote:
On 9/27/24 10:19, Guenter Roeck wrote:
Copying devicetree maintainers.
On Thu, Sep 26, 2024 at 09:39:38PM -0700, Guenter Roeck wrote:
On Thu,
On 9/28/24 11:31, Guenter Roeck wrote:
On 9/27/24 17:08, Guenter Roeck wrote:
On 9/27/24 13:45, Shuah Khan wrote:
On 9/27/24 10:19, Guenter Roeck wrote:
Copying devicetree maintainers.
On Thu, Sep 26, 2024 at 09:39:38PM -0700, Guenter Roeck wrote:
On Thu, Sep 26, 2024 at 09:14:11PM -0700, Gu
Hi Linus,
Please pull this fixes update for Linux 6.12-rc1.
This kselftest fixes update for Linux 6.12-rc1 consists of an urgent
fix to vDSO as automated testing is failing due to this bug.
diff is attached.
thanks,
-- Shuah
The
On 9/27/24 17:08, Guenter Roeck wrote:
On 9/27/24 13:45, Shuah Khan wrote:
On 9/27/24 10:19, Guenter Roeck wrote:
Copying devicetree maintainers.
On Thu, Sep 26, 2024 at 09:39:38PM -0700, Guenter Roeck wrote:
On Thu, Sep 26, 2024 at 09:14:11PM -0700, Guenter Roeck wrote:
Hi Stephen,
On Thu,
The pull request you sent on Fri, 27 Sep 2024 14:29:00 -0700:
> git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git/
> tags/modules-6.12-rc1
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/6f81a446f86106c68630032e114024ec7a557077
Thank you!
--
Deet-doot-d
Introduce a new test to identify regressions causing devices to go
missing on the system.
For each bus and class on the system the test checks the number of
devices present against a reference file, which needs to have been
generated by the program at a previous point on a known-good kernel, and
i
On 2024-09-28 17:49, Alan Stern wrote:
On Sat, Sep 28, 2024 at 11:32:18AM -0400, Mathieu Desnoyers wrote:
On 2024-09-28 16:49, Alan Stern wrote:
On Sat, Sep 28, 2024 at 09:51:27AM -0400, Mathieu Desnoyers wrote:
equality, which does not preserve address dependencies and allows the
following mi
On Sat, Sep 28, 2024 at 11:32:18AM -0400, Mathieu Desnoyers wrote:
> On 2024-09-28 16:49, Alan Stern wrote:
> > On Sat, Sep 28, 2024 at 09:51:27AM -0400, Mathieu Desnoyers wrote:
> > > equality, which does not preserve address dependencies and allows the
> > > following misordering speculations:
>
On 2024-09-28 16:49, Alan Stern wrote:
On Sat, Sep 28, 2024 at 09:51:27AM -0400, Mathieu Desnoyers wrote:
Compiler CSE and SSA GVN optimizations can cause the address dependency
of addresses returned by rcu_dereference to be lost when comparing those
pointers with either constants or previously
On 2024-09-28 16:49, Alan Stern wrote:
On Sat, Sep 28, 2024 at 09:51:27AM -0400, Mathieu Desnoyers wrote:
[...]
+/*
+ * Compare two addresses while preserving the address dependencies for
+ * later use of the address. It should be used when comparing an address
+ * returned by rcu_dereference()
On 2024-09-28 16:58, Alan Stern wrote:
On Sat, Sep 28, 2024 at 09:51:28AM -0400, Mathieu Desnoyers wrote:
[...]
-- Be very careful about comparing pointers obtained from
- rcu_dereference() against non-NULL values. As Linus Torvalds
- explained, if the two pointers are equal,
On Sat, Sep 28, 2024 at 09:51:28AM -0400, Mathieu Desnoyers wrote:
> Refer to ptr_eq() in the rcu_dereference() documentation.
>
> ptr_eq() is a mechanism that preserves address dependencies when
> comparing pointers, and should be favored when comparing a pointer
> obtained from rcu_dereference()
On Sat, Sep 28, 2024 at 09:51:27AM -0400, Mathieu Desnoyers wrote:
> Compiler CSE and SSA GVN optimizations can cause the address dependency
> of addresses returned by rcu_dereference to be lost when comparing those
> pointers with either constants or previously loaded pointers.
>
> Introduce ptr_
Hello,
syzbot found the following issue on:
HEAD commit:abf2050f51fd Merge tag 'media/v6.12-1' of git://git.kernel..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15a0310798
kernel config: https://syzkaller.appspot.com/x/.config?x=2a8c36c5e2b56016
das
Compiler CSE and SSA GVN optimizations can cause the address dependency
of addresses returned by rcu_dereference to be lost when comparing those
pointers with either constants or previously loaded pointers.
Introduce ptr_eq() to compare two addresses while preserving the address
dependencies for l
Introduce ptr_eq() to compare two addresses while preserving the address
dependencies for later use of the address. It should be used when
comparing an address returned by rcu_dereference().
Thanks,
Mathieu
Cc: Greg Kroah-Hartman
Cc: Sebastian Andrzej Siewior
Cc: "Paul E. McKenney"
Cc: Will D
Refer to ptr_eq() in the rcu_dereference() documentation.
ptr_eq() is a mechanism that preserves address dependencies when
comparing pointers, and should be favored when comparing a pointer
obtained from rcu_dereference() against another pointer.
Signed-off-by: Mathieu Desnoyers
Cc: Greg Kroah-H
Thanks for your response,
Am 9/28/2024 um 1:33 PM schrieb Mathieu Desnoyers:
This is a userspace prototype. This will behave similarly to a userspace
spinlock in that case, which is not great in terms of CPU usage, but
should eventually unblock the waiter, unless it has a RT priority that
reall
On 2024-09-28 13:22, Jonas Oberhauser wrote:
Two more questions below:
Am 9/21/2024 um 6:42 PM schrieb Mathieu Desnoyers:
+#define NR_PERCPU_SLOTS_BITS 3
Have you measured any advantage of this multi-slot version vs a version
with just one normal slot and one emergency slot?
No, I have
On Fri, Sep 27, 2024 at 07:05:53PM -0400, Mathieu Desnoyers wrote:
> On 2024-09-27 22:33, Mathieu Desnoyers wrote:
> [...]
>
> > ---
> > include/linux/compiler.h | 62
> > 1 file changed, 62 insertions(+)
> >
>
> I'm wondering if this really belongs in
Two more questions below:
Am 9/21/2024 um 6:42 PM schrieb Mathieu Desnoyers:
+#define NR_PERCPU_SLOTS_BITS 3
Have you measured any advantage of this multi-slot version vs a version
with just one normal slot and one emergency slot?
With just one normal slot, the normal slot version would alw
On Fri, 27 Sept 2024 at 22:52, Andrii Nakryiko
wrote:
>
> On Fri, Sep 27, 2024 at 6:14 AM Björn Töpel wrote:
> >
> > From: Björn Töpel
> >
> > The prog_tests programs do not include the per-arch tools include
> > path, e.g. tools/arch/riscv/include. Some architectures depend those
> > files to b
Andrii,
On Fri, 27 Sept 2024 at 22:51, Andrii Nakryiko
wrote:
>
> On Fri, Sep 27, 2024 at 6:14 AM Björn Töpel wrote:
> >
> > From: Björn Töpel
> >
> > libbpf does not include the per-arch tools include path, e.g.
> > tools/arch/riscv/include. Some architectures depend those files to
> > build p
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