linux-kernel - Re: [PATCH] [stable 4.14 patch] x86: fix KMEMCHECK warning about FRAME

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Message-ID: <20180221112631.GA19900@kroah.com>
Date:   Wed, 21 Feb 2018 12:26:31 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     stable@...r.kernel.org, Josh Poimboeuf <jpoimboe@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [stable 4.14 patch] x86: fix KMEMCHECK warning about
 FRAME_POINTER

On Fri, Feb 16, 2018 at 04:29:10PM +0100, Arnd Bergmann wrote:
> When KMEMCHECK is enabled without UNWINDER_FRAME_POINTER, we get a
> Kconfig warning, presumably harmless:
> 
> warning: (FAULT_INJECTION_STACKTRACE_FILTER && LATENCYTOP && KMEMCHECK && LOCKDEP && UNWINDER_FRAME_POINTER) selects FRAME_POINTER which has unmet direct dependencies (DEBUG_KERNEL && (CRIS || M68K || FRV || UML || SUPERH || BLACKFIN || MN10300 || METAG) || ARCH_WANT_FRAME_POINTERS || !UNWINDER_ORC && !UNWINDER_GUESS)
> 
> In newer mainline kernels, the KMEMCHECK option has been removed, so
> this no longer happens. Adding the unwinder as a direct dependency
> for KMEMCHECK works for 4.14-stable as well and documents the
> dependency better.

4.14.y now has that option removed as well, as I just removed all of
kmemcheck as it was "getting in the way" of other patches, so this isn't
needed anymore.

thanks,

greg k-h