From: Segher Boessenkool <segher@kernel.crashing.org>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: "ajd@linux.ibm.com" <ajd@linux.ibm.com>,
"peterz@infradead.org" <peterz@infradead.org>,
"npiggin@gmail.com" <npiggin@gmail.com>,
"rostedt@goodmis.org" <rostedt@goodmis.org>,
"ardb@kernel.org" <ardb@kernel.org>,
"jbaron@akamai.com" <jbaron@akamai.com>,
Benjamin Gray <bgray@linux.ibm.com>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"jpoimboe@kernel.org" <jpoimboe@kernel.org>
Subject: Re: [PATCH v3 5/6] powerpc/64: Add support for out-of-line static calls
Date: Thu, 6 Oct 2022 13:22:54 -0500 [thread overview]
Message-ID: <20221006182254.GR25951@gate.crashing.org> (raw)
In-Reply-To: <878rltpyy1.fsf@mpe.ellerman.id.au>
On Thu, Oct 06, 2022 at 11:39:50AM +1100, Michael Ellerman wrote:
> Christophe Leroy <christophe.leroy@csgroup.eu> writes:
> > However, thinking out loudly, I'm wondering, could we make things any
> > simpler when CONFIG_MODULES is not selected, or is that a too much
> > corner case on PPC64 ?
>
> I'd say it's mostly a corner case.
>
> Obviously no distros ship with modules disabled.
>
> AFAIK even the stripped down kernels we use in CPU bringup have modules
> enabled.
>
> So I think it's probably not worth worrying about, unless there's an
> obvious and fairly simple optimisation.
Long ago I built kernels that fit together with the boot firmware and a
root fs (busybox+dropbear essentially) in 4MB, but I doubt we can get
close to that at all these days :-)
What is the overhead if you enable modules but do not use them, these
days?
Segher
next prev parent reply other threads:[~2022-10-06 18:28 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-05 5:32 [PATCH v3 0/6] Out-of-line static calls for powerpc64 ELF V2 Benjamin Gray
2022-10-05 5:32 ` [PATCH v3 1/6] powerpc/code-patching: Implement generic text patching function Benjamin Gray
2022-10-05 17:55 ` Christophe Leroy
2022-10-06 3:36 ` Benjamin Gray
2022-10-06 9:19 ` Christophe Leroy
2022-10-06 21:53 ` Benjamin Gray
2022-10-05 5:32 ` [PATCH v3 2/6] powerpc/module: Handle caller-saved TOC in module linker Benjamin Gray
2022-10-05 19:18 ` Christophe Leroy
2022-10-06 3:51 ` Andrew Donnellan
2022-10-06 4:39 ` Benjamin Gray
2022-10-05 5:32 ` [PATCH v3 3/6] powerpc/module: Optimise nearby branches in ELF V2 ABI stub Benjamin Gray
2022-10-05 19:21 ` Christophe Leroy
2022-10-06 8:24 ` Andrew Donnellan
2022-10-05 5:32 ` [PATCH v3 4/6] static_call: Move static call selftest to static_call_selftest.c Benjamin Gray
2022-10-05 19:22 ` Christophe Leroy
2022-10-05 5:32 ` [PATCH v3 5/6] powerpc/64: Add support for out-of-line static calls Benjamin Gray
2022-10-05 19:38 ` Christophe Leroy
2022-10-06 0:39 ` Michael Ellerman
2022-10-06 5:01 ` Benjamin Gray
2022-10-06 18:22 ` Segher Boessenkool [this message]
2022-10-06 18:38 ` Christophe Leroy
2022-10-06 20:45 ` Segher Boessenkool
2022-10-06 20:50 ` Christophe Leroy
2022-10-06 21:04 ` Segher Boessenkool
2022-10-05 5:32 ` [PATCH v3 6/6] powerpc: Add tests " Benjamin Gray
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20221006182254.GR25951@gate.crashing.org \
--to=segher@kernel.crashing.org \
--cc=ajd@linux.ibm.com \
--cc=ardb@kernel.org \
--cc=bgray@linux.ibm.com \
--cc=jbaron@akamai.com \
--cc=jpoimboe@kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mpe@ellerman.id.au \
--cc=npiggin@gmail.com \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.