linux-kernel - Re: Linux 4.16-rc4

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Date:   Mon, 05 Mar 2018 11:05:16 +0100
From:   Martin Steigerwald <martin@...htvoll.de>
To:     Sven Joachim <svenjoac@....de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Linux 4.16-rc4

Hi Sven.

Sven Joachim - 05.03.18, 09:09:
> On 2018-03-04 15:15 -0800, Linus Torvalds wrote:
> > Hmm. A reasonably calm week - the biggest change is to the 'kvm-stat'
> > tool, not any actual kernel files.
> > 
> > But there's small changes all over, with architecture updates (x86,
> > s390, arm, parisc) and drivers (media, md, gpu, sound) being the bulk
> > of it.  But there's some filesystem fixes (mostly btrfs),
> > documentation updates etc too.
> > 
> > Go test,
> 
> Huh, this version does not build for me:
> 
> ,----
> 
> |   CALL    scripts/checksyscalls.sh
> |   DESCEND  objtool
> |   CC       /usr/local/src/linux/tools/objtool/check.o
> | 
> | In file included from check.c:26:0:
> | check.c: In function 'read_retpoline_hints':
> | warn.h:57:3: error: format '%ld' expects argument of type 'long int', but
> | argument 5 has type 'unsigned int' [-Werror=format=]| 
> |    "%s: warning: objtool: " format "\n", \
> |    ^
> | 
> | check.c:1135:3: note: in expansion of macro 'WARN'
> | 
> |    WARN("retpoline_safe size mismatch: %d %ld", sec->len, sizeof(unsigned
> |    long)); ^~~~
> | 
> | check.c:1135:44: note: format string is defined here
> | 
> |    WARN("retpoline_safe size mismatch: %d %ld", sec->len, sizeof(unsigned
> |    long));|    
> |                                           ~~^
> |                                           %d
> | 
> | cc1: all warnings being treated as errors
> | mv: cannot stat '/usr/local/src/linux/tools/objtool/.check.o.tmp': No such
> | file or directory /usr/local/src/linux/tools/build/Makefile.build:96:
> | recipe for target '/usr/local/src/linux/tools/objtool/check.o' failed
> | make[3]: *** [/usr/local/src/linux/tools/objtool/check.o] Error 1
> 
> `----
> 
> This might be because I still use a 32-bit userland with a 64-bit
> kernel.

Building just fine here with a 64-bit userland on Debian Sid and also working 
just fine, so far:

% cat /proc/version
Linux version 4.16.0-rc4-tp520-btrfstrim+ (martin@...kaba) (gcc version 7.3.0 
(Debian 7.3.0-5)) #42 SMP PREEMPT Mon Mar 5 10:22:42 CET 2018

Of course a build failure may be triggered by different configuration or any 
number of other reasons than using 32-bit userland.

Retpoline protection is active here:

% grep . /sys/devices/system/cpu/vulnerabilities/*
/sys/devices/system/cpu/vulnerabilities/meltdown:Mitigation: PTI
/sys/devices/system/cpu/vulnerabilities/spectre_v1:Mitigation: __user pointer 
sanitization
/sys/devices/system/cpu/vulnerabilities/spectre_v2:Mitigation: Full generic 
retpoline

Thanks,
-- 
Martin