RE: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads
From: David Laight <hidden>
Date: 2021-05-06 09:54:01
Also in:
linux-toolchains, lkml
Possibly related (same subject, not in this thread)
- 2021-04-14 · Re: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads · Stefan Metzmacher <metze@samba.org>
- 2021-04-11 · [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads · Stefan Metzmacher <metze@samba.org>
quoted
(To avoid confusion, this is not a universal property of Linux. arm64 and arm32 tasks on an arm64 Linux host are different and cannot arbitrarily switch modes.)Although there are patches lurking to change that. (not from me).
Actually they may be just to allow 64bit tasks make 32bit system calls. The code is almost certainly still 54bit. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)