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([2600:1010:b054:ff26:3849:a65d:14d0:f668]) by smtp.gmail.com with ESMTPSA id d11sm2771801pgi.25.2018.11.29.09.41.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 29 Nov 2018 09:41:35 -0800 (PST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (1.0) Subject: Re: [PATCH v2 4/4] x86/static_call: Add inline static call implementation for x86-64 From: Andy Lutomirski X-Mailer: iPhone Mail (16B92) In-Reply-To: <20181129122156.782e739e@gandalf.local.home> Date: Thu, 29 Nov 2018 09:41:33 -0800 Cc: Peter Zijlstra , Josh Poimboeuf , Andy Lutomirski , X86 ML , LKML , Ard Biesheuvel , Ingo Molnar , Thomas Gleixner , Linus Torvalds , Masami Hiramatsu , Jason Baron , Jiri Kosina , David Laight , Borislav Petkov , julia@ni.com, jeyu@kernel.org, "H. Peter Anvin" Content-Transfer-Encoding: quoted-printable Message-Id: <666E3CE2-CD96-4271-8F9C-614F96D24F26@amacapital.net> References: <20181126200801.GW2113@hirez.programming.kicks-ass.net> <20181126212628.4apztfazichxnt7r@treble> <20181127084330.GX2113@hirez.programming.kicks-ass.net> <20181129094210.GC2131@hirez.programming.kicks-ass.net> <20181129143853.GO2131@hirez.programming.kicks-ass.net> <20181129163342.tp5wlfcyiazwwyoh@treble> <20181129164914.GA9027@hirez.programming.kicks-ass.net> <0FDA053D-7ADC-4F42-AEA5-99DA155FCED0@amacapital.net> <20181129171539.GD9027@hirez.programming.kicks-ass.net> <20181129122000.7fb4fb04@gandalf.local.home> <20181129122156.782e739e@gandalf.local.home> To: Steven Rostedt Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Nov 29, 2018, at 9:21 AM, Steven Rostedt wrote: >=20 > On Thu, 29 Nov 2018 12:20:00 -0500 > Steven Rostedt wrote: >=20 >=20 >> r8 =3D return address >> r9 =3D function to call >>=20 >=20 > Bad example, r8 and r9 are args, but r10 and r11 are available. >=20 > -- Steve >=20 >> push r8 >> jmp *r9 >>=20 >> Then have the regs->ip point to that trampoline. Cute. That=E2=80=99ll need ORC annotations and some kind of retpoline to rep= lace the indirect jump, though. >>=20 >> -- Steve >=20