linux-kernel - Re: [PATCH] cpufreq: powernv: fix stack bloat and NR

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Date:   Thu, 17 Oct 2019 21:34:44 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
CC:     Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        <linux-pm@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] cpufreq: powernv: fix stack bloat and NR_CPUS limitation

On 10/17/19 9:27 PM, Viresh Kumar wrote:
> On 17-10-19, 17:04, John Hubbard wrote:
>> The following build warning occurred on powerpc 64-bit builds:
>>
>> drivers/cpufreq/powernv-cpufreq.c: In function 'init_chip_info':
>> drivers/cpufreq/powernv-cpufreq.c:1070:1: warning: the frame size of 1040 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> 
> How come we are catching this warning after 4 years ?
> 

Newer compilers. And btw, I don't spend a lot of time in powerpc
code, so I just recently ran this, and I guess everyone has been on less
new compilers so far, it seems.

I used a gcc 8.1 cross compiler in this case:

$ $ /blue_exp/kernel/cross-compilers/powerpc64/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc -v
Using built-in specs.
COLLECT_GCC=/blue_exp/kernel/cross-compilers/powerpc64/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc
COLLECT_LTO_WRAPPER=/home/jhubbard/blue_exp/kernel/cross-compilers/powerpc64/gcc-8.1.0-nolibc/powerpc64-linux/bin/../libexec/gcc/powerpc64-linux/8.1.0/lto-wrapper
Target: powerpc64-linux
Configured with: /home/arnd/git/gcc/configure --target=powerpc64-linux --enable-targets=all --prefix=/home/arnd/cross/x86_64/gcc-8.1.0-nolibc/powerpc64-linux --enable-languages=c --without-headers --disable-bootstrap --disable-nls --disable-threads --disable-shared --disable-libmudflap --disable-libssp --disable-libgomp --disable-decimal-float --disable-libquadmath --disable-libatomic --disable-libcc1 --disable-libmpx --enable-checking=release
Thread model: single
gcc version 8.1.0 (GCC) 

thanks,

John Hubbard
NVIDIA