s390 updates for 6.2-rc4
- Add various missing READ_ONCE() to cmpxchg() loops prevent the compiler
from potentially generating incorrect code. This includes a rather large
change to the s390 specific hardware sampling code and its current use of
cmpxchg_double().
Do the fix now to get it out of the way of Peter Zijlstra's cmpxchg128()
work, and have something that can be backported. The added new code
includes a private 128 bit cmpxchg variant which will be removed again
after Peter's rework is available. Also note that this 128 bit cmpxchg
variant is used to implement 128 bit READ_ONCE(), while strictly speaking
it wouldn't be necessary, and _READ_ONCE() should also be sufficient;
even though it isn't obvious for all converted locations that this is the
case. Therefore use this implementation for for the sake of clarity and
consistency for now.
- Fix ipl report address handling to avoid kdump failures/hangs.
- Fix misuse of #(el)if in kernel decompressor.
- Define RUNTIME_DISCARD_EXIT to fix link error with GNU ld < 2.36, caused
by the recently changed discard behaviour.
- Make sure _edata and _end symbols are always page aligned.
- The current header guard DEBUG_H in one of the s390 specific header files
is too generic and conflicts with the ath9k wireless driver. Add an
_ASM_S390_ prefix to the guard to make it unique.
- Update defconfigs.
s390: update defconfigs
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
3 files changed
