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SubjectRe: Linux 4.16-rc4
Date
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@merkaba) (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

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