From: Segher Boessenkool <segher@kernel.crashing.org>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: David Laight <david.laight.linux@gmail.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
Naveen N Rao <naveen@kernel.org>,
Madhavan Srinivasan <maddy@linux.ibm.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Darren Hart <dvhart@infradead.org>,
Davidlohr Bueso <dave@stgolabs.net>,
Andre Almeida <andrealmeid@igalia.com>,
Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 0/5] powerpc: Implement masked user access
Date: Sat, 5 Jul 2025 06:42:49 -0500 [thread overview]
Message-ID: <aGkPubjld7r6v2vm@gate> (raw)
In-Reply-To: <3e9bff9f-1aaf-4e91-a6c0-328a343d18f1@csgroup.eu>
Hi!
On Sat, Jul 05, 2025 at 12:55:06PM +0200, Christophe Leroy wrote:
> > > For book3s64, GCC only use isel with -mcpu=power9 or -mcpu=power10
> >
> > I have no idea what "book3s64" means.
>
> Well that's the name given in Linux kernel to the 64 bits power CPU
> processors.
A fantasy name. Great.
> > What is "powerpc/32"? It does not help if you use different names from
> > what everyone else does.
>
> Again, that's the way it is called in Linux kernel, refer below commits
> subjects:
And another.
> It means everything built with CONFIG_PPC32
Similar names for very dissimilar concepts, even! Woohoo!
> > > For powerpc/64 we have less constraint than on powerpc32:
> > > - Kernel memory starts at 0xc000000000000000
> > > - User memory stops at 0x0010000000000000
> >
> > That isn't true, not even if you mean some existing name. Usually
> > userspace code is mapped at 256MB (0x10000000). On powerpc64-linux
> > anyway, different default on different ABIs of course :-)
>
> 0x10000000 is below 0x0010000000000000, isn't it ? So why isn't it true ?
I understood "starts at". I read cross-eyed maybe, hehe.
Segher
next prev parent reply other threads:[~2025-07-05 11:44 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-22 9:52 [PATCH 0/5] powerpc: Implement masked user access Christophe Leroy
2025-06-22 9:52 ` [PATCH 1/5] uaccess: Add masked_user_{read/write}_access_begin Christophe Leroy
2025-06-22 16:35 ` David Laight
2025-06-24 5:34 ` Christophe Leroy
2025-06-22 9:52 ` [PATCH 2/5] uaccess: Add speculation barrier to copy_from_user_iter() Christophe Leroy
2025-06-22 16:52 ` David Laight
2025-06-22 16:57 ` Linus Torvalds
2025-06-22 20:18 ` David Laight
2025-06-24 5:49 ` Christophe Leroy
2025-06-24 8:07 ` David Laight
2025-06-24 15:15 ` Linus Torvalds
2025-06-22 9:52 ` [PATCH 3/5] powerpc: Remove unused size parametre to KUAP enabling/disabling functions Christophe Leroy
2025-06-22 9:52 ` [PATCH 4/5] powerpc: Move barrier_nospec() out of allow_read_{from/write}_user() Christophe Leroy
2025-06-22 9:52 ` [PATCH 5/5] powerpc: Implement masked user access Christophe Leroy
2025-06-22 17:13 ` David Laight
2025-06-22 17:40 ` Linus Torvalds
2025-06-22 19:51 ` David Laight
2025-06-22 18:57 ` Segher Boessenkool
2025-06-27 8:09 ` kernel test robot
2025-06-22 16:20 ` [PATCH 0/5] " David Laight
2025-06-24 5:27 ` Christophe Leroy
2025-06-24 8:32 ` David Laight
2025-06-24 21:37 ` Segher Boessenkool
2025-06-25 8:30 ` David Laight
2025-06-24 13:17 ` Segher Boessenkool
2025-06-24 16:50 ` David Laight
2025-06-24 18:25 ` Segher Boessenkool
2025-06-24 21:08 ` David Laight
2025-06-26 5:56 ` Christophe Leroy
2025-06-26 22:01 ` Segher Boessenkool
2025-07-05 10:55 ` Christophe Leroy
2025-07-05 11:42 ` Segher Boessenkool [this message]
2025-07-05 18:33 ` David Laight
2025-07-05 20:15 ` Segher Boessenkool
2025-07-05 21:05 ` David Laight
2025-07-05 21:37 ` Segher Boessenkool
2025-06-26 21:39 ` Segher Boessenkool
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