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From: Mark Rutland <mark.rutland@arm.com>
To: Amit Kachhap <Amit.Kachhap@arm.com>
Cc: Will Deacon <will@kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Catalin Marinas <Catalin.Marinas@arm.com>,
	"deller@gmx.de" <deller@gmx.de>, "duwe@suse.de" <duwe@suse.de>,
	"James.Bottomley@HansenPartnership.com" 
	<James.Bottomley@HansenPartnership.com>,
	James Morse <James.Morse@arm.com>,
	"jeyu@kernel.org" <jeyu@kernel.org>,
	"jpoimboe@redhat.com" <jpoimboe@redhat.com>,
	"jthierry@redhat.com" <jthierry@redhat.com>,
	"linux-parisc@vger.kernel.org" <linux-parisc@vger.kernel.org>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"peterz@infradead.org" <peterz@infradead.org>,
	"rostedt@goodmis.org" <rostedt@goodmis.org>,
	"svens@stackframe.org" <svens@stackframe.org>,
	"takahiro.akashi@linaro.org" <takahiro.akashi@linaro.org>
Subject: Re: [PATCHv2 0/8] arm64: ftrace cleanup + FTRACE_WITH_REGS
Date: Mon, 4 Nov 2019 14:04:40 +0000
Message-ID: <20191104140440.GJ45140@lakrids.cambridge.arm.com> (raw)
In-Reply-To: <d9b738fa-b7c5-f1b2-3878-d7afa4ba7ba5@arm.com>

On Mon, Nov 04, 2019 at 01:03:51PM +0000, Amit Kachhap wrote:
> 
> 
> On 11/4/19 6:26 PM, Will Deacon wrote:
> > On Sat, Nov 02, 2019 at 05:42:25PM +0530, Amit Daniel Kachhap wrote:
> >> On 10/29/19 10:28 PM, Mark Rutland wrote:
> >>> This series is a reworked version of Torsten's FTRACE_WITH_REGS series
> >>> [1]. I've tried to rework the existing code in preparatory patches so
> >>> that the patchable-function-entry bits slot in with fewer surprises.
> >>> This version is based on v5.4-rc3, and can be found in my
> >>> arm64/ftrace-with-regs branch [2].
> >>>
> >>> Patch 1 adds an (optional) ftrace_init_nop(), which the core code uses
> >>> to initialize callsites. This allows us to avoid a synthetic MCOUNT_ADDR
> >>> symbol, and more cleanly separates the one-time initialization of the
> >>> callsite from dynamic NOP<->CALL modification. Architectures which don't
> >>> implement this get the existing ftrace_make_nop() with MCOUNT_ADDR.
> >>>
> >>> Recently parisc gained ftrace support using patchable-function-entry.
> >>> Patch 2 makes the handling of module callsite locations common in
> >>> kernel/module.c with a new FTRACE_CALLSITE_SECTION definition, and
> >>> removed the newly redundant bits from arch/parisc.
> >>>
> >>> Patches 3 and 4 move the module PLT initialization to module load time,
> >>> which simplifies runtime callsite modification. This also means that we
> >>> don't transitently mark the module text RW, and will allow for the
> >>> removal of module_disable_ro().
> >>>
> >>> Patches 5 and 6 add some trivial infrastructure, with patch 7 finally
> >>> adding FTRACE_WITH_REGS support. Additional work will be required for
> >>> livepatching (e.g. implementing reliable stack trace), which is
> >>> commented as part of patch 7.
> >>>
> >>> Patch 8 is a trivial cleanup atop of the rest of the series, making the
> >>> code easier to read and less susceptible to config-specific breakage.
> >> I tested the whole series with my latest in-kernel ptrauth patches [1]
> >> and graph_tracer/function_graph_tracer works fine, So for the whole series,
> >> Tested-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
> >>
> >> Also I gave few minor comments in the individual patches. With those
> >> comments,
> >> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
> Oops sorry I meant,
> Reviewed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>

Thanks!

I've added the Tested-by for the whole series, and the Reviewed-by for
patches 4 and 7. I haven't added it for patch 1 just yet; please reply
to my comment there if you'd still like to add a Reviewed-by.

Mark.

  reply index

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-29 16:58 Mark Rutland
2019-10-29 16:58 ` [PATCHv2 1/8] ftrace: add ftrace_init_nop() Mark Rutland
2019-10-30 15:00   ` Miroslav Benes
2019-11-02 12:19   ` Amit Daniel Kachhap
2019-11-04 13:11     ` Steven Rostedt
2019-11-05  6:59       ` Amit Kachhap
2019-11-04 13:36     ` Mark Rutland
2019-11-05  6:47       ` Amit Kachhap
2019-11-06 14:15         ` Mark Rutland
2019-11-07  4:40           ` Amit Kachhap
2019-11-04 13:16   ` Steven Rostedt
2019-11-04 13:38     ` Mark Rutland
2019-11-04 13:53       ` Steven Rostedt
2019-10-29 16:58 ` [PATCHv2 2/8] module/ftrace: handle patchable-function-entry Mark Rutland
2019-10-30 15:03   ` Torsten Duwe
2019-10-31  9:02     ` Mark Rutland
2019-10-31 11:42       ` Torsten Duwe
2019-10-31 13:00         ` Mark Rutland
2019-11-04 13:28           ` Steven Rostedt
2019-11-04 14:00             ` Mark Rutland
2019-11-04 13:25   ` Steven Rostedt
2019-11-04 15:51   ` Mark Rutland
2019-11-04 20:58     ` Helge Deller
2019-11-05  8:59   ` Miroslav Benes
2019-10-29 16:58 ` [PATCHv2 3/8] arm64: module: rework special section handling Mark Rutland
2019-10-30 15:25   ` Miroslav Benes
2019-10-29 16:58 ` [PATCHv2 4/8] arm64: module/ftrace: intialize PLT at load time Mark Rutland
2019-11-02 12:20   ` Amit Daniel Kachhap
2019-11-04 13:55     ` Mark Rutland
2019-10-29 16:58 ` [PATCHv2 5/8] arm64: insn: add encoder for MOV (register) Mark Rutland
2019-10-29 16:58 ` [PATCHv2 6/8] arm64: asm-offsets: add S_FP Mark Rutland
2019-10-29 16:58 ` [PATCHv2 7/8] arm64: implement ftrace with regs Mark Rutland
2019-11-02 12:21   ` Amit Daniel Kachhap
2019-11-04 13:51     ` Mark Rutland
     [not found]   ` <CANW9uyug8WKN2fR-FmcW-C_OO_OQ_AvukM+BR7wqiJ9eFQMO9Q@mail.gmail.com>
2019-11-15  7:45     ` Torsten Duwe
2019-11-15 13:59     ` Mark Rutland
2019-10-29 16:58 ` [PATCHv2 8/8] arm64: ftrace: minimize ifdeffery Mark Rutland
2019-10-30 17:02 ` [PATCHv2 0/8] arm64: ftrace cleanup + FTRACE_WITH_REGS Torsten Duwe
2019-10-31 17:16 ` Torsten Duwe
2019-11-01  9:08   ` Mark Rutland
2019-11-01 15:39 ` Sven Schnelle
2019-11-01 16:28   ` Mark Rutland
2019-11-02 12:12 ` Amit Daniel Kachhap
2019-11-04 12:56   ` Will Deacon
2019-11-04 13:03     ` Amit Kachhap
2019-11-04 14:04       ` Mark Rutland [this message]
2019-11-05  7:06         ` Amit Kachhap
2019-11-07 11:31 ` Catalin Marinas

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