Hi, On 2022-07-14 02:52, Wookey wrote: > On 2022-07-01 15:53 +0200, Ard Biesheuvel wrote: > > The 32-bit ARM kernel implements fixups on behalf of user space when > > using LDM/STM or LDRD/STRD instructions on addresses that are not 32-bit > > aligned. > > > This feature is one of the remaining impediments to being able to switch > > to 64-bit kernels on 64-bit capable hardware running 32-bit user space, > > so let's implement it for the arm64 compat layer as well. > > > Note to cc'ees: if this is something you would like to see merged, > > please indicate so. This stuff is unlikely to get in if there are no > > users. > > Decent 32-bit arm hardware is thin on the ground these days. Debian > still has some but it's getting old and flaky. Being able to build > reliably on 64-bit hardware is important and useful. Unaligned > accesses are much less of a problem than they used to be, but they can > still happen, so having these fixups available is definitely a good > thing. > > Debian runs its 32-bit buildds with alignment fixups turned on. It > looks like the boxes still hit about 1 per day. > > We also do 32 bit builds on 64-bit kernels (in 32-bit userspaces) and > it mostly works. We do have packages that fail on 64-bit kernels and > have to be built on real 32-bit hardware, but I don't know how much of > that would be fixed by this patch. Some, presumably. > > So yes, cheers for this. It is helpful in the real world (or at least > it should be).
I confirm that this would be very helpful to Debian, so that 32-bit binaries behaves the same with a 32-bit or a 64-bit kernel. Otherwise we need to keep running (old) 32-bit hardware. What's the status of those patches? Thanks Aurelien -- Aurelien Jarno GPG: 4096R/1DDD8C9B aurel...@aurel32.net http://www.aurel32.net
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