From: David Laight <David.Laight@ACULAB.COM>
To: 'Arnd Bergmann' <arnd@kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Arnd Bergmann" <arnd@arndb.de>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-rt-devel@lists.linux.dev" <linux-rt-devel@lists.linux.dev>,
"Ard Biesheuvel" <ardb@kernel.org>,
Clark Williams <clrkwllms@kernel.org>,
"Jason Baron" <jbaron@akamai.com>,
Josh Poimboeuf <jpoimboe@kernel.org>,
"Linus Walleij" <linus.walleij@linaro.org>,
Mark Rutland <mark.rutland@arm.com>,
Matthew Wilcox <willy@infradead.org>,
Peter Zijlstra <peterz@infradead.org>,
Russell King <linux@armlinux.org.uk>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>
Subject: RE: [PATCH 3/4] ARM: drop CONFIG_HIGHPTE support
Date: Sat, 14 Dec 2024 18:40:11 +0000 [thread overview]
Message-ID: <d54e11cf3f4d4216b5cecf29b761cd45@AcuMS.aculab.com> (raw)
In-Reply-To: <20241210160556.2341497-4-arnd@kernel.org>
From: Arnd Bergmann
> Sent: 10 December 2024 16:06
...
> Since Arm is the last architecture remaining that uses this, and almost
> no 32-bit machines support more than 4GB of RAM, the cost of continuing
> to maintain HIGHPTE seems unjustified, so remove it here to allow
> simplifying the generic page table handling.
'Picking at nits' 'highmem' support was needed for systems with 4GB of RAM
in order to use more than 3GB or 3.5GB (depending on the bios) because
of the physical addresses that are reserved for PCI (and other MMIO).
David
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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2024-12-14 18:41 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-10 16:05 [PATCH 0/4] ARM: towards 32-bit preempt-rt support Arnd Bergmann
2024-12-10 16:05 ` [PATCH 1/4] ARM: Disable jump-label on PREEMPT_RT Arnd Bergmann
2024-12-11 13:04 ` Linus Walleij
2024-12-11 13:26 ` Sebastian Andrzej Siewior
2024-12-10 16:05 ` [PATCH 2/4] ARM: Disable HIGHPTE on PREEMPT_RT kernels Arnd Bergmann
2024-12-11 13:29 ` Linus Walleij
2024-12-11 15:22 ` Sebastian Andrzej Siewior
2024-12-13 0:27 ` Linus Walleij
2024-12-13 9:11 ` Russell King (Oracle)
2024-12-14 22:11 ` Matthew Wilcox
2024-12-11 13:48 ` Sebastian Andrzej Siewior
2024-12-11 14:04 ` Sebastian Andrzej Siewior
2024-12-11 14:30 ` Arnd Bergmann
2024-12-11 15:55 ` Russell King (Oracle)
2024-12-20 14:37 ` Arnd Bergmann
2024-12-10 16:05 ` [PATCH 3/4] ARM: drop CONFIG_HIGHPTE support Arnd Bergmann
2024-12-11 13:32 ` Linus Walleij
2024-12-11 13:50 ` Russell King (Oracle)
2024-12-11 14:31 ` Linus Walleij
2024-12-11 14:25 ` Sebastian Andrzej Siewior
2024-12-14 18:40 ` David Laight [this message]
2024-12-20 13:10 ` Linus Walleij
2024-12-20 14:30 ` Arnd Bergmann
2024-12-10 16:05 ` [PATCH 4/4] mm: drop HIGHPTE support altogether Arnd Bergmann
2024-12-11 13:53 ` Linus Walleij
2024-12-11 14:29 ` Sebastian Andrzej Siewior
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