Date: Wed, 9 Jun 2021 09:03:12 +0200 From: Arnd Bergmann <arnd@...nel.org> To: musl@...ts.openwall.com Cc: Rich Felker <dalias@...c.org>, Markus Wichmann <nullplan@....net>, Florian Weimer <fweimer@...hat.com> Subject: Re: Backwards kernel compatibility On Wed, Jun 2, 2021 at 1:52 PM Arnd Bergmann <arnd@...nel.org> wrote: > On Wed, Jun 2, 2021 at 9:38 AM Martin Vajnar <martin.vajnar@...il.com> wrote: > > > > The main source of overhead comes from the kernel 4.4 which on arm64 > > produces stack traces when not implemented syscall is invoked: > > > > https://github.com/torvalds/linux/blob/afd2ff9b7e1b367172f18ba7f693dfb62bdcb2dc/arch/arm64/kernel/traps.c#L369 > > That is clearly a bug that was fixed in mainline and backported to linux-4.14 > but not 4.4 or 4.9. I've sent a manual backport for inclusion in those kernels > now. The backport is now merged into the stable kernel trees and should be part of 4.4.272/4.9.272. Arnd
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