Re: [PATCH 00/13] jump label v9

From: David Miller
Date: Tue Jun 15 2010 - 13:12:59 EST

From: Jason Baron <jbaron@xxxxxxxxxx>
Date: Tue, 15 Jun 2010 10:28:11 -0400

> For example, the reason I have it in the code is b/c x86 determines
> the best no-op at run-time. Are other architectures going to have to
> require this kind of functionality. Or like sparc, are we going to
> be able to generally hard-code the nops on non-x86 at compile-time?

I think most architectures will use a constant nop sequence, in fact
x86 is the only one I can think of that needs variable nop sequences.

Why not abstract this behind some asm/jump_label.h macro just like
everything else? "jump_label_text_poke_early()" or similar.
On sparc64 I would define this to:

#include <asm/system.h>

static inline void jump_label_text_poke_early(void *addr, const void *opcode, size_t len)
u32 new_insn = *(u32 *)opcode;
u32 *insn_p = (u32 *) addr;

*insn_p = new_insn;
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