* Re: LKML: Vasily Gorbik: [GIT PULL] s390 patches for the 5.6 merge window [not found] ` <CAKwvOdm+1bMq-uZxe96HViKLzT7jRyxdS68KLyOXhMm2hM9F5w@mail.gmail.com> @ 2020-02-10 17:58 ` Vasily Gorbik 2020-02-10 18:30 ` David Hildenbrand 0 siblings, 1 reply; 2+ messages in thread From: Vasily Gorbik @ 2020-02-10 17:58 UTC (permalink / raw) To: Nick Desaulniers; +Cc: clang-built-linux, LKML, David Hildenbrand On Fri, Feb 07, 2020 at 10:22:20PM +0000, Nick Desaulniers wrote: > + Vasily for real > > On Fri, Feb 7, 2020, 11:02 PM Nick Desaulniers <ndesaulniers@google.com> > wrote: > > > https://lkml.org/lkml/2020/1/28/1141 > > > > Yo, what's up with clang 10 support? I believe s390 kernel had limited clang build support since about 5.2 (with jump labels and ftrace disabled), thanks to contributions from Arnd Bergmann. With asm goto support in clang 9 and now everything for ftrace in place in clang 10 s390 kernel should be in a good shape feature wise (including KASAN). At this stage clang based tooling is the main interest. > > > > Can I boot this in qemu? > > qemu tcg seems to work fine for gcc built s390 kernels. While clang built kernels run smoothly natively and with accel=kvm there is still something to be fixed for accel=tcg (kernel fails to boot on both s390 and x86). ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: LKML: Vasily Gorbik: [GIT PULL] s390 patches for the 5.6 merge window 2020-02-10 17:58 ` LKML: Vasily Gorbik: [GIT PULL] s390 patches for the 5.6 merge window Vasily Gorbik @ 2020-02-10 18:30 ` David Hildenbrand 0 siblings, 0 replies; 2+ messages in thread From: David Hildenbrand @ 2020-02-10 18:30 UTC (permalink / raw) To: Vasily Gorbik, Nick Desaulniers; +Cc: clang-built-linux, LKML On 10.02.20 18:58, Vasily Gorbik wrote: > On Fri, Feb 07, 2020 at 10:22:20PM +0000, Nick Desaulniers wrote: >> + Vasily for real >> >> On Fri, Feb 7, 2020, 11:02 PM Nick Desaulniers <ndesaulniers@google.com> >> wrote: >> >>> https://lkml.org/lkml/2020/1/28/1141 >>> >>> Yo, what's up with clang 10 support? > I believe s390 kernel had limited clang build support since about 5.2 > (with jump labels and ftrace disabled), thanks to contributions from Arnd > Bergmann. With asm goto support in clang 9 and now everything for ftrace > in place in clang 10 s390 kernel should be in a good shape feature wise > (including KASAN). At this stage clang based tooling is the main interest. > >>> >>> Can I boot this in qemu? >>> > qemu tcg seems to work fine for gcc built s390 kernels. While clang built > kernels run smoothly natively and with accel=kvm there is still something > to be fixed for accel=tcg (kernel fails to boot on both s390 and x86). > Any details on that (e.g., kernel splat)? Could be that TCG doesn't like a specific instruction - but could also be that some code is broken that is not taken by HW/KVM (esp. because TCG implements less CPU facilities - e.g., no support for huge pages). Cheers! -- Thanks, David / dhildenb ^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-02-10 17:58 ` LKML: Vasily Gorbik: [GIT PULL] s390 patches for the 5.6 merge window Vasily Gorbik
2020-02-10 18:30 ` David Hildenbrand
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