From: Peter Zijlstra <peterz@infradead.org>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, x86@kernel.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
Steven Rostedt <rostedt@goodmis.org>,
namit@vmware.com
Subject: Re: [PATCH 5/5] x86/kernel: jump_table: use relative references
Date: Thu, 28 Jun 2018 10:31:07 +0200 [thread overview]
Message-ID: <20180628083107.GY2494@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20180627160604.8154-6-ard.biesheuvel@linaro.org>
On Wed, Jun 27, 2018 at 06:06:04PM +0200, Ard Biesheuvel wrote:
> Similar to the arm64 case, 64-bit x86 can benefit from using 32-bit
> relative references rather than 64-bit absolute ones when emitting
> struct jump_entry instances. Not only does this reduce the memory
> footprint of the entries themselves by 50%, it also removes the need
> for carrying relocation metadata on relocatable builds (i.e., for KASLR)
> which saves a fair chunk of .init space as well (although the savings
> are not as dramatic as on arm64)
This will conflict with:
https://lkml.kernel.org/r/20180622172212.199633-10-namit@vmware.com
next prev parent reply other threads:[~2018-06-28 8:31 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-27 16:05 [PATCH 0/5] add support for relative references in jump tables Ard Biesheuvel
2018-06-27 16:06 ` [PATCH 1/5] kernel/jump_label: abstract jump_entry member accessors Ard Biesheuvel
2018-06-28 8:40 ` Peter Zijlstra
2018-06-27 16:06 ` [PATCH 2/5] kernel/jump_label: implement generic support for relative references Ard Biesheuvel
2018-06-28 8:50 ` Peter Zijlstra
2018-06-28 9:02 ` Ard Biesheuvel
2018-06-28 9:04 ` Ard Biesheuvel
2018-06-28 9:25 ` Peter Zijlstra
2018-06-28 9:29 ` Ard Biesheuvel
2018-06-28 9:37 ` Peter Zijlstra
2018-06-27 16:06 ` [PATCH 3/5] arm64/kernel: jump_label: switch to " Ard Biesheuvel
2018-06-28 9:17 ` Will Deacon
2018-06-27 16:06 ` [PATCH 4/5] x86: jump_label: switch to jump_entry accessors Ard Biesheuvel
2018-06-28 9:11 ` Peter Zijlstra
2018-06-28 9:14 ` Ard Biesheuvel
2018-06-27 16:06 ` [PATCH 5/5] x86/kernel: jump_table: use relative references Ard Biesheuvel
2018-06-28 8:31 ` Peter Zijlstra [this message]
2018-06-28 8:34 ` Ard Biesheuvel
2018-06-28 9:28 ` Peter Zijlstra
2018-07-02 5:14 ` [lkp-robot] [x86/kernel] b1ff47aace: WARNING:at_kernel/jump_label.c:#__jump_label_update kernel test robot
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