Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option

From	Will Deacon <will.deacon@arm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option
Date	2015-11-06 17:20 +0100
Message-ID	<qrRU6-6M2-15@gated-at.bofh.it> (permalink)
References	<qravM-3Aq-3@gated-at.bofh.it> <qrOtb-4v4-11@gated-at.bofh.it> <qrRU7-6M2-17@gated-at.bofh.it>
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On Fri, Nov 06, 2015 at 04:12:14PM +0000, Catalin Marinas wrote:
> On Fri, Nov 06, 2015 at 12:30:09PM +0000, Will Deacon wrote:
> > On Wed, Nov 04, 2015 at 09:37:51AM -0800, Yang Shi wrote:
> > > FRAME_POINTER is defined in lib/Kconfig.debug, it is unnecessary to redefine
> > > it in arch/arm64/Kconfig.debug.
> > 
> > It might be worth noting that this adds a dependency on DEBUG_KERNEL
> > for building with frame pointers. I'm ok with that (it appears to be
> > enabled in defconfig and follows the vast majority of other archs) but
> > it is a change in behaviour.
> 
> We shouldn't have the dependency on DEBUG_KERNEL since we select
> ARCH_WANT_FRAME_POINTERS on arm64. However, the patch would allow one to
> disable FRAME_POINTERS (not sure it has any effect on the aarch64 gcc
> though).

Ah yes, you're right about DEBUG_KERNEL. I completely misread the brackets
and the left-associativity of &&/|| works out.

I still think Rutland has a valid point wrt junk frame pointers, though.

Will
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[PATCH] arm64: remove redundant FRAME_POINTER kconfig option Yang Shi <yang.shi@linaro.org> - 2015-11-04 19:00 +0100
  Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option Will Deacon <will.deacon@arm.com> - 2015-11-06 13:40 +0100
    Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option Mark Rutland <mark.rutland@arm.com> - 2015-11-06 14:00 +0100
      Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option Will Deacon <will.deacon@arm.com> - 2015-11-06 16:50 +0100
      Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option Will Deacon <will.deacon@arm.com> - 2015-11-06 17:30 +0100
        Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option "Shi, Yang" <yang.shi@linaro.org> - 2015-11-06 18:30 +0100
          Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option Catalin Marinas <catalin.marinas@arm.com> - 2015-11-06 18:40 +0100
            Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option "Shi, Yang" <yang.shi@linaro.org> - 2015-11-06 18:40 +0100
              Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option Catalin Marinas <catalin.marinas@arm.com> - 2015-11-06 19:00 +0100
                Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option "Shi, Yang" <yang.shi@linaro.org> - 2015-11-06 19:00 +0100
                Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option Catalin Marinas <catalin.marinas@arm.com> - 2015-11-09 17:00 +0100
      Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option Catalin Marinas <catalin.marinas@arm.com> - 2015-11-06 17:30 +0100
    Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option Catalin Marinas <catalin.marinas@arm.com> - 2015-11-06 17:20 +0100
      Re: [PATCH] arm64: remove redundant FRAME_POINTER kconfig option Will Deacon <will.deacon@arm.com> - 2015-11-06 17:20 +0100

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