From: Mark Rutland <mark.rutland@arm.com>
To: Torsten Duwe <duwe@suse.de>
Cc: linux-arm-kernel@lists.infradead.org,
Jessica Yu <jeyu@kernel.org>, Helge Deller <deller@gmx.de>,
"James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
linux-kernel@vger.kernel.org, amit.kachhap@arm.com,
catalin.marinas@arm.com, james.morse@arm.com,
jpoimboe@redhat.com, jthierry@redhat.com,
linux-parisc@vger.kernel.org, mingo@redhat.com,
peterz@infradead.org, rostedt@goodmis.org, svens@stackframe.org,
takahiro.akashi@linaro.org, will@kernel.org
Subject: Re: [PATCHv2 2/8] module/ftrace: handle patchable-function-entry
Date: Thu, 31 Oct 2019 13:00:22 +0000 [thread overview]
Message-ID: <20191031130022.GB3477@blommer> (raw)
In-Reply-To: <20191031114223.GA11684@suse.de>
On Thu, Oct 31, 2019 at 12:42:23PM +0100, Torsten Duwe wrote:
> On Thu, Oct 31, 2019 at 09:02:32AM +0000, Mark Rutland wrote:
> > I agree that the CC_USING_PATCHABLE_FUNCTION_ENTRY ifdeffery could be
> > simplified, and that it would be nice to consistently use
> > FTRACE_CALLSITE_SECTION if we can. However, the generic linker script doesn't
> > include anything, and I don't see a good location for that to live.
> >
> > What I could do is add an explicit comment:
> >
> > /*
> > * The ftrace call sites are logged to a section whose name depends on the
> > * compiler option used. A given kernel image will only use one, AKA
> > * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
> > * dependencies.
> > */
> > #define MCOUNT_REC() \
> > . = ALIGN(8); \
> > __start_mcount_loc = .; \
> > KEEP(*(__patchable_function_entries)) \
> > KEEP(*(__mcount_loc)) \
> > __stop_mcount_loc = .;
> >
> > ... which should make the dependency clear. Does that sound good to you?
>
> Beautiful. I just didn't want to miss the opportunity to have this cleaned
> up as well, and deemed this patch "closest" because of the definition of
> FTRACE_CALLSITE_SECTION. Put it where you see it fit best.
Sure. I've folded the above into this patch, and pushed out an updated branch:
https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/log/?h=arm64/ftrace-with-regs
Thanks,
Mark.
next prev parent reply other threads:[~2019-10-31 13:00 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-29 16:58 [PATCHv2 0/8] arm64: ftrace cleanup + FTRACE_WITH_REGS 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 [this message]
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
2019-11-05 7:06 ` Amit Kachhap
2019-11-07 11:31 ` Catalin Marinas
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