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From: Peter Zijlstra <peterz@infradead.org>
To: x86@kernel.org, peterz@infradead.org, linux-kernel@vger.kernel.org
Cc: Josh Poimboeuf <jpoimboe@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Daniel Bristot de Oliveira <bristot@redhat.com>,
	Jason Baron <jbaron@akamai.com>, Nadav Amit <namit@vmware.com>,
	Andy Lutomirski <luto@kernel.org>,
	Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>,
	Vineet Gupta <Vineet.Gupta1@synopsys.com>
Subject: [RFC][PATCH 0/8] jump_label, x86: Support variable sized JMP instructions
Date: Fri, 28 Jun 2019 12:21:13 +0200
Message-ID: <20190628102113.360432762@infradead.org> (raw)

After discussing jump_labels with Eugeny and Vineet the other day, I started
playing with adding support for our 2 byte JMP/8 instruction. Much thanks to
Josh for (re)discovering the .skip trick.

These patches boot an x86_64 defconfig in kvm, so it must be perfect.

Using the 2 byte jumps saves about ~6k text for an x86_64-defconfig build.


             reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-28 10:21 Peter Zijlstra [this message]
2019-06-28 10:21 ` [RFC][PATCH 1/8] x86/alternatives: Teach text_poke_bp() to emulate instructions Peter Zijlstra
2019-06-28 10:21 ` [RFC][PATCH 2/8] jump_label, x86: Strip ASM jump_label support Peter Zijlstra
2019-06-28 10:21 ` [RFC][PATCH 3/8] jump_label, x86: Factor out the __jump_table generation Peter Zijlstra
2019-06-28 10:21 ` [RFC][PATCH 4/8] jump_label, x86: Remove init NOP optimization Peter Zijlstra
2019-06-28 10:21 ` [RFC][PATCH 5/8] jump_label, x86: Improve error when we fail expected text Peter Zijlstra
2019-06-28 10:21 ` [RFC][PATCH 6/8] jump_label, x86: Add variable length patching support Peter Zijlstra
2019-06-28 10:21 ` [RFC][PATCH 7/8] jump_label, x86: Introduce jump_entry_size() Peter Zijlstra
2019-06-28 10:21 ` [RFC][PATCH 8/8] jump_label, x86: Enable JMP8/NOP2 support Peter Zijlstra

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