ac5f89c7d8
This patch adds support for the new "jump label" feature. Unlike x86 and sparc we just merrily patch the code with no locks etc, as far as I know this is safe, but I'm not really sure what the x86/sparc code is protecting against so maybe it's not. I also don't see any reason for us to implement the poke_early() routine, even though sparc does. [BenH: Updated the patch to upstream generic changes] Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
23 lines
663 B
C
23 lines
663 B
C
/*
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* Copyright 2010 Michael Ellerman, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/jump_label.h>
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#include <asm/code-patching.h>
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void arch_jump_label_transform(struct jump_entry *entry,
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enum jump_label_type type)
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{
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u32 *addr = (u32 *)(unsigned long)entry->code;
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if (type == JUMP_LABEL_ENABLE)
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patch_branch(addr, entry->target, 0);
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else
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patch_instruction(addr, PPC_INST_NOP);
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}
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