From: Ingo Molnar <mingo@kernel.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: Jiri Slaby <jslaby@suse.cz>,
mingo@redhat.com, tglx@linutronix.de, hpa@zytor.com,
x86@kernel.org, jpoimboe@redhat.com,
linux-kernel@vger.kernel.org,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>,
xen-devel@lists.xenproject.org,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <len.brown@intel.com>,
linux-pm@vger.kernel.org
Subject: Re: [PATCH v2 02/10] x86: assembly, FUNC_START for fn, DATA_START for data
Date: Wed, 22 Mar 2017 08:25:57 +0100 [thread overview]
Message-ID: <20170322072557.GA13904@gmail.com> (raw)
In-Reply-To: <20170321140840.GA23311@amd>
* Pavel Machek <pavel@ucw.cz> wrote:
> Hi!
>
> > -ENTRY(saved_rbp) .quad 0
> > -ENTRY(saved_rsi) .quad 0
> > -ENTRY(saved_rdi) .quad 0
> > -ENTRY(saved_rbx) .quad 0
> > +SYM_DATA_START(saved_rbp) .quad 0
> > +SYM_DATA_START(saved_rsi) .quad 0
> > +SYM_DATA_START(saved_rdi) .quad 0
> > +SYM_DATA_START(saved_rbx) .quad 0
>
> Does it make sense to call it SYM_DATA_*START* when there's no
> corresponding end?
That looks like a bug - I think we should strive for them to always be in pairs.
Jiri, Josh, could objtool help here perhaps, to detect 'non-terminated'
SYM_*_START() uses? This could be done by emitting debug data into a special
section and then analyzing that section for unpaired entries. The section can be
discarded in the final link, it won't show up in the kernel image.
We don't ever nest symbols, right?
> Plus... it looks like saved_rsi (and friends) are only used inside
> wakeup_64.S. Could we just delete the "ENTRY" annotations?
That appears to make sense as well.
Thanks,
Ingo
next prev parent reply other threads:[~2017-03-22 7:26 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-17 10:47 [PATCH 01/10] x86: assembly, ENTRY for fn, GLOBAL for data Jiri Slaby
2017-02-17 10:47 ` [PATCH 02/10] x86: assembly, use ENDPROC for functions Jiri Slaby
2017-02-17 11:08 ` Juergen Gross
2017-02-17 11:06 ` [PATCH 01/10] x86: assembly, ENTRY for fn, GLOBAL for data Juergen Gross
2017-03-01 9:38 ` Ingo Molnar
2017-03-01 9:50 ` Jiri Slaby
2017-03-01 10:09 ` Thomas Gleixner
2017-03-01 10:27 ` Ingo Molnar
2017-03-03 12:22 ` Jiri Slaby
2017-03-03 18:20 ` hpa
2017-03-06 14:09 ` Jiri Slaby
2017-03-07 7:57 ` Ingo Molnar
2017-03-03 18:24 ` hpa
2017-03-07 8:27 ` Ingo Molnar
2017-03-07 17:24 ` [RFC] linkage: new macros for functions and data Jiri Slaby
2017-03-16 8:02 ` Ingo Molnar
2017-03-16 8:13 ` Jiri Slaby
2017-03-20 12:32 ` [PATCH v2 01/10] linkage: new macros for assembler symbols Jiri Slaby
2017-03-20 12:32 ` [PATCH v2 02/10] x86: assembly, FUNC_START for fn, DATA_START for data Jiri Slaby
2017-03-20 13:32 ` Josh Poimboeuf
2017-03-20 15:32 ` Jiri Slaby
2017-03-20 16:07 ` Josh Poimboeuf
2017-03-21 14:08 ` Pavel Machek
2017-03-22 7:25 ` Ingo Molnar [this message]
2017-03-22 7:39 ` Jiri Slaby
2017-03-22 7:46 ` Ingo Molnar
2017-03-22 14:11 ` Josh Poimboeuf
2017-03-22 15:01 ` Jiri Slaby
2017-03-22 15:33 ` Josh Poimboeuf
2017-03-23 7:38 ` Ingo Molnar
2017-03-23 13:24 ` Josh Poimboeuf
2017-03-22 12:06 ` Jiri Slaby
2017-03-22 15:52 ` Pavel Machek
2017-03-20 12:32 ` [PATCH v2 03/10] x86: assembly, use SYM_FUNC_END for functions Jiri Slaby
2017-03-21 14:48 ` Josh Poimboeuf
2017-03-22 7:29 ` Ingo Molnar
2017-03-22 14:26 ` Josh Poimboeuf
2017-03-22 15:44 ` Jiri Slaby
2017-04-10 11:23 ` Jiri Slaby
2017-04-10 19:35 ` Josh Poimboeuf
2017-04-12 6:24 ` Jiri Slaby
2017-04-12 6:52 ` Ingo Molnar
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