linux.git/arch/s390/kernel/processor.c, branch v5.17

s390: replace deprecated CPU-hotplug functions

2021-08-05T12:10:53+00:00

The functions get_online_cpus() and put_online_cpus() have been
deprecated during the CPU hotplug rework. They map directly to
cpus_read_lock() and cpus_read_unlock().

Replace deprecated CPU-hotplug functions with the official version.
The behavior remains unchanged.

Signed-off-by: Sebastian Andrzej Siewior 
Link: https://lore.kernel.org/r/20210803141621.780504-5-bigeasy@linutronix.de
Signed-off-by: Heiko Carstens

s390/hwcaps: make sie capability regular hwcap

2021-07-27T07:39:21+00:00

Commit 7f16d7e787b7 ("s390: show virtualization support in /proc/cpuinfo")
introduced special handling for sie capability, saying this should not be
exposed via hwcaps, without giving a reason.

However this leads to an inconsistent /proc/cpuinfo features line
where all features except the sie capability are also present in
hwcaps. I really don't see a reason to not add that to hwcaps - it
might be quite pointless, but at least this way it is possible to get
rid of some special handling.

Signed-off-by: Heiko Carstens

s390/hwcaps: remove hwcap stfle check

2021-07-27T07:39:21+00:00

Remove the not so obvious "(elf_hwcap & (1UL << 2)" which only checks
if stfle is available. This used to be required for old code before
test_facility() was introduced. test_facility() will do the right
thing, regardless if stfle is available or not.

Signed-off-by: Heiko Carstens

s390/hwcaps: remove z/Architecture mode active check

2021-07-27T07:39:21+00:00

Remove a leftover from the common 31/64 bit code. z/Architecture mode
is now always active, there is no need to check.

Signed-off-by: Heiko Carstens

s390/hwcaps: use consistent coding style / remove comments

2021-07-27T07:39:21+00:00

Use a consistent coding style within setup_hwcaps() and remove obvious
and outdated comments.

Signed-off-by: Heiko Carstens

s390/hwcaps: open code initialization of first six hwcap bits

2021-07-27T07:39:21+00:00

The first six hwcap bits are initialized in a rather odd way: an array
contains the stfl(e) bits which need to be set, so that the
corresponding bit position (= array index) within hwcaps are set.

Better open code it like it is done for all other bits, making it
obvious which bit is set when.

Signed-off-by: Heiko Carstens

s390/hwcaps: split setup_hwcaps()

2021-07-27T07:39:20+00:00

setup_hwcaps() is a quite large function. Make it smaller by moving
the elf platform setup code into an independent setup function.

Signed-off-by: Heiko Carstens

s390/hwcaps: move setup_hwcaps()

2021-07-27T07:39:20+00:00

Move setup_hwcaps() to processor.c for two reasons:
- make setup.c a bit smaller
- have allmost all of the hwcap code in one file

Signed-off-by: Heiko Carstens

s390/hwcaps: add sanity checks

2021-07-27T07:39:20+00:00

Add BUILD_BUG_ON() sanity checks to make sure the hwcap string array
contains a string for each hwcap.

Signed-off-by: Heiko Carstens

s390/hwcaps: use named initializers for hwcap string arrays

2021-07-27T07:39:20+00:00

Use named initializers to make it obvious which hwcap string array
element belongs to which hwcap.

Signed-off-by: Heiko Carstens