From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 6C6D0385781E; Mon, 25 Oct 2021 16:46:59 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 6C6D0385781E
From: "nsz at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/28432] Aarch64 memcpy used on device-memory
Date: Mon, 25 Oct 2021 16:46:59 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.32
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: nsz at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at sourceware dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-28432-131-asyhPKFfw6@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-28432-131@http.sourceware.org/bugzilla/>
References: <bug-28432-131@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: glibc-bugs@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Glibc-bugs mailing list <glibc-bugs.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/glibc-bugs/>
List-Help: <mailto:glibc-bugs-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Mon, 25 Oct 2021 16:46:59 -0000

https://sourceware.org/bugzilla/show_bug.cgi?id=3D28432

--- Comment #7 from Szabolcs Nagy <nsz at gcc dot gnu.org> ---
for the patch to be accepted,
- it has to be posted to libc-alpha
- we need reasonable confidence that it fixes an issue
- there should be no relevant performance regression

looking at
https://lore.kernel.org/lkml/CAK8P3a1CdL5ZVvWPMriOknTCgkfbR4F-a6dRZ7ap9+NiD=
8H5cg@mail.gmail.com/
and followup mail i'd expect this to be a hw issue
somewhere between the core and the pci framebuffer.

i think we need to document what hw was this bug
observed on (all components involved).

(ideally it would be demonstrated which hw is at fault
e.g. via traces of intermediate protocols or trying
different combinations of hw components.)

(note that glibc is not the only runtime library with
this memcpy code, and the compiler may also generate
similar code patterns)

--=20
You are receiving this mail because:
You are on the CC list for the bug.=