From: Peter Zijlstra <peterz@infradead.org>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: alexandre.chartre@oracle.com, linux-kernel@vger.kernel.org,
jthierry@redhat.com, tglx@linutronix.de, x86@kernel.org
Subject: Re: [RFC][PATCH 3/7] objtool: Allow branches within the same alternative.
Date: Sun, 19 Apr 2020 21:27:54 +0200 [thread overview]
Message-ID: <20200419192754.GY20696@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20200419163219.b5dpg246xh6avsci@treble>
On Sun, Apr 19, 2020 at 11:32:19AM -0500, Josh Poimboeuf wrote:
> On Thu, Apr 16, 2020 at 05:07:55PM +0200, Peter Zijlstra wrote:
> > From: Alexandre Chartre <alexandre.chartre@oracle.com>
> >
> > Currently objtool prevents any branch to an alternative. While preventing
> > branching from the outside to the middle of an alternative makes perfect
> > sense, branching within the same alternative should be allowed. To do so,
> > identify each alternative and check that a branch to an alternative comes
> > from the same alternative.
> >
> > Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> > Link: https://lkml.kernel.org/r/20200414103618.12657-3-alexandre.chartre@oracle.com
>
> I I think I'd rather just drop this patch. It adds some complexity and
> I don't really see a benefit to having the warning in the first place.
Also; we totally don't need it, sorry for not realizing that earlier.
Consider it gone.
next prev parent reply other threads:[~2020-04-19 19:28 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-16 15:07 [RFC][PATCH 0/7] objtool vs retpoline Peter Zijlstra
2020-04-16 15:07 ` [RFC][PATCH 1/7] objtool: is_fentry_call() crashes if call has no destination Peter Zijlstra
2020-04-16 15:07 ` [RFC][PATCH 2/7] objtool: UNWIND_HINT_RET_OFFSET should not check registers Peter Zijlstra
2020-04-16 15:07 ` [RFC][PATCH 3/7] objtool: Allow branches within the same alternative Peter Zijlstra
2020-04-19 16:32 ` Josh Poimboeuf
2020-04-19 19:27 ` Peter Zijlstra [this message]
2020-04-16 15:07 ` [RFC][PATCH 4/7] objtool: Add support for intra-function calls Peter Zijlstra
2020-04-19 16:41 ` Josh Poimboeuf
2020-04-23 11:40 ` Peter Zijlstra
2020-04-16 15:07 ` [RFC][PATCH 5/7] x86/speculation: Change __FILL_RETURN_BUFFER to work with objtool Peter Zijlstra
2020-04-19 16:51 ` Josh Poimboeuf
2020-04-19 16:55 ` Josh Poimboeuf
2020-04-19 18:58 ` Peter Zijlstra
2020-04-16 15:07 ` [RFC][PATCH 6/7] x86/retpoline: Out-of-line retpoline Peter Zijlstra
2020-04-16 15:22 ` Peter Zijlstra
2020-04-16 15:07 ` [RFC][PATCH 7/7] x86/nospec: Remove ANNOTATE_NOSPEC_ALTERNATIVE Peter Zijlstra
2020-04-16 15:32 ` [RFC][PATCH 0/7] objtool vs retpoline Peter Zijlstra
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