From: "Schimpe, Christina" <christina.schimpe@intel.com>
To: "Torvalds, Linus" <torvalds@linux-foundation.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Kostya Serebryany <kcc@google.com>,
"Andrey Ryabinin" <ryabinin.a.a@gmail.com>,
Andrey Konovalov <andreyknvl@gmail.com>,
Alexander Potapenko <glider@google.com>,
Taras Madan <tarasmadan@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
"Edgecombe, Rick P" <rick.p.edgecombe@intel.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: RE: [PATCH] mm: Fix access_remote_vm() regression on tagged addresses
Date: Thu, 10 Aug 2023 12:42:36 +0000 [thread overview]
Message-ID: <CY4PR11MB2005976F49613E20BC072ECCF913A@CY4PR11MB2005.namprd11.prod.outlook.com> (raw)
In-Reply-To: <CAHk-=whaGTq11x_F1Y+J85j+Eh7JxVqH1sWpqgH+-7wQZ1ZE2A@mail.gmail.com>
> Interesting that it took this long to notice.
>
> Not surprising considering that LAM isn't actually available, but I'd have
> expected the arm people to notice more. Yes, I have (and test) my
> arm64 laptop, but I obviously don't do user space debugging on it.
> Apparently others don't either.
>
> Or maybe TBI is used a lot less than I thought.
Just for the record:
We don't have any LAM support in GDB yet, we are just working on it.
We currently rely on that feature, but could still change it. We don't
necessarily require /proc/PID/mem to support tagged addresses.
ARM's TBI support in GDB does not rely on /proc/PID/mem to support tagged
addresses AFAIK.
I also thought that the kernel does not support tagged addresses for
/proc/PID/mem in case of ARM. This is at least reflected by their patches
for TBI and the kernel docs
https://www.kernel.org/doc/Documentation/arm64/tagged-pointers.txt.
Christina
Intel Deutschland GmbH
Registered Address: Am Campeon 10, 85579 Neubiberg, Germany
Tel: +49 89 99 8853-0, www.intel.de <http://www.intel.de>
Managing Directors: Christin Eisenschmid, Sharon Heck, Tiffany Doon Silva
Chairperson of the Supervisory Board: Nicole Lau
Registered Office: Munich
Commercial Register: Amtsgericht Muenchen HRB 186928
next prev parent reply other threads:[~2023-08-10 12:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-09 14:46 Kirill A. Shutemov
2023-08-09 15:05 ` Linus Torvalds
2023-08-10 12:42 ` Schimpe, Christina [this message]
2023-08-10 18:39 ` Linus Torvalds
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