linux-kernel - Re: [PATCH] Fix unwind_frame for clang-built kernels

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Message-ID: <20200618220312.GK1551@shell.armlinux.org.uk>
Date:   Thu, 18 Jun 2020 23:03:12 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     Nathan Huckleberry <nhuck@...gle.com>, vincent.whitchurch@...s.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] Fix unwind_frame for clang-built kernels

On Wed, Jun 17, 2020 at 06:23:48AM +0200, Sedat Dilek wrote:
> On Wed, Jun 17, 2020 at 12:36 AM 'Nathan Huckleberry' via Clang Built
> Linux <clang-built-linux@...glegroups.com> wrote:
> >
> > Since clang does not push pc and sp in function prologues, the current
> > implementation of unwind_frame does not work. By using the previous
> > frame's lr/fp instead of saved pc/sp we get valid unwinds on clang-built
> > kernels.
> >
> > The bounds check on next frame pointer must be changed as well since
> > there are 8 less bytes between frames.
> >
> > This fixes /proc/<pid>/stack.
> >
> > Link: https://github.com/ClangBuiltLinux/linux/issues/912
> > Signed-off-by: Nathan Huckleberry <nhuck@...gle.com>
> 
> Just a small nit.
> 
> Please label your patch with: "arm/stacktrace: ..." or "arm: stacktrace: ..."

Convention is to use "ARM: ..." for arch/arm.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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