From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
"Linus Torvalds" <torvalds@linux-foundation.org>,
"Peter Zijlstra" <peterz@infradead.org>,
"kernel test robot" <lkp@intel.com>,
linux-arm-kernel@lists.infradead.org,
"Nathan Chancellor" <nathan@kernel.org>,
"Christophe Leroy" <christophe.leroy@csgroup.eu>,
"Darren Hart" <dvhart@infradead.org>,
"Davidlohr Bueso" <dave@stgolabs.net>,
"André Almeida" <andrealmeid@igalia.com>,
x86@kernel.org, "Alexander Viro" <viro@zeniv.linux.org.uk>,
"Christian Brauner" <brauner@kernel.org>,
"Jan Kara" <jack@suse.cz>,
linux-fsdevel@vger.kernel.org
Subject: Re: [patch V2 1/6] ARM: uaccess: Implement missing __get_user_asm_dword()
Date: Tue, 16 Sep 2025 22:26:18 +0100 [thread overview]
Message-ID: <aMnV-hAwRnLJflC7@shell.armlinux.org.uk> (raw)
In-Reply-To: <20250916163252.037251747@linutronix.de>
On Tue, Sep 16, 2025 at 06:33:09PM +0200, Thomas Gleixner wrote:
> When CONFIG_CPU_SPECTRE=n then get_user() is missing the 8 byte ASM variant
> for no real good reason. This prevents using get_user(u64) in generic code.
I'm sure you will eventually discover the reason when you start getting
all the kernel build bot warnings that will result from a cast from a
u64 to a pointer.
You're not the first to try implementing this.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
next prev parent reply other threads:[~2025-09-16 21:26 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-16 16:33 [patch V2 0/6] uaccess: Provide and use scopes for user masked access Thomas Gleixner
2025-09-16 16:33 ` [patch V2 1/6] ARM: uaccess: Implement missing __get_user_asm_dword() Thomas Gleixner
2025-09-16 21:26 ` Russell King (Oracle) [this message]
2025-09-17 5:48 ` Thomas Gleixner
2025-09-17 9:41 ` Russell King (Oracle)
2025-09-17 12:35 ` Christophe Leroy
2025-09-17 13:55 ` Thomas Gleixner
2025-09-17 15:17 ` Russell King (Oracle)
2025-09-17 17:14 ` Nathan Chancellor
2025-09-17 17:34 ` Russell King (Oracle)
2025-09-17 19:25 ` Thomas Gleixner
2025-09-17 18:44 ` Thomas Gleixner
2025-09-19 18:27 ` [patch V2a " Thomas Gleixner
2025-09-16 16:33 ` [patch V2 2/6] kbuild: Disable asm goto on clang < 17 Thomas Gleixner
2025-09-16 18:44 ` Nathan Chancellor
2025-09-16 20:43 ` Thomas Gleixner
2025-09-16 20:56 ` [patch V2a 2/6] kbuild: Disable CC_HAS_ASM_GOTO_OUTPUT on clang < version 17 Thomas Gleixner
2025-09-16 21:50 ` Nathan Chancellor
2025-09-24 7:36 ` [tip: core/urgent] kbuild: Disable CC_HAS_ASM_GOTO_OUTPUT on clang < 17 tip-bot2 for Thomas Gleixner
2025-09-29 9:38 ` [patch V2a 2/6] kbuild: Disable CC_HAS_ASM_GOTO_OUTPUT on clang < version 17 Geert Uytterhoeven
2025-09-29 10:08 ` Peter Zijlstra
2025-09-29 10:58 ` Geert Uytterhoeven
2025-09-29 11:04 ` Peter Zijlstra
2025-09-29 11:10 ` Geert Uytterhoeven
2025-09-29 15:53 ` Linus Torvalds
2025-10-02 18:47 ` David Laight
2025-09-29 22:05 ` Thomas Gleixner
2025-09-16 16:33 ` [patch V2 3/6] uaccess: Provide scoped masked user access regions Thomas Gleixner
2025-09-18 13:20 ` Mathieu Desnoyers
2025-09-19 9:10 ` Thomas Gleixner
2025-09-16 16:33 ` [patch V2 4/6] futex: Convert to scoped masked user access Thomas Gleixner
2025-09-16 16:33 ` [patch V2 5/6] x86/futex: " Thomas Gleixner
2025-09-16 16:33 ` [patch V2 6/6] select: " Thomas Gleixner
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