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Date: Thu, 12 Nov 2020 12:39:39 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Steven Rostedt <rostedt@...dmis.org> Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Miroslav Benes <mbenes@...e.cz>, Thomas Gleixner <tglx@...utronix.de>, Masami Hiramatsu <mhiramat@...nel.org>, Josh Poimboeuf <jpoimboe@...hat.com>, Jiri Kosina <jikos@...nel.org>, live-patching@...r.kernel.org Subject: Re: [PATCH 3/3 v5] livepatch: Use the default ftrace_ops instead of REGS when ARGS is available On Thu, Nov 12, 2020 at 09:21:44AM +0100, Peter Zijlstra wrote: > Also, do you want something like: > > unsigned long ftrace_regs_get_register(struct ftrace_regs *regs, unsigned int offset) > { I forgot the full regs case: if (regs->regs.cs) return regs_get_register(regs->regs, offset); > switch (offset / sizeof(long)) { > case 4: /* RBP */ > > case 8: /* R9 */ > case 9: /* R8 */ > case 10: /* RAX */ > case 11: /* RCX */ > case 12: /* RDX */ > case 13: /* RSI */ > case 14: /* RDI */ > case 15: /* ORIG_RAX */ > case 16: /* RIP */ > return *(unsigned long *)regs->regs + offset; > > default: > WARN_ON_ONCE(1); > } > return 0; > }
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