** Description changed:
The IBM Z team requests to raise the architectural level set (ALS) for Ubuntu
on IBM Z and LinuxONE (s390x) to z15, optimized for z16.
For the gcc-15 compiler (and with that for user space) that would be in
debian/rules2:
march=z15
mtune=z16
For now gcc-15 (15.2) is the default in resolute.
For the kernel that would be:
debian.master/config/annotations
CONFIG_MARCH_Z15 policy<{'s390x': 'y'}>
CONFIG_TUNE_Z16 policy<{'s390x': 'y'}>
Changes in llvm are reflected in debian/rules like:
- # Change the default CPU for s390x
- ZARCH=z196
- ifeq ($(DERIVATIVE),Ubuntu)
- ifneq (,$(filter $(DISTRO), xenial bionic focal jammy noble plucky
questing))
- ZARCH=z13
- else
- ZARCH=z15
- endif
- endif
+ # Change the default CPU for s390x
+ ZARCH=z196
+ ifeq ($(DERIVATIVE),Ubuntu)
+ ifneq (,$(filter $(DISTRO), xenial bionic focal jammy noble plucky
questing))
+ ZARCH=z13
+ else
+ ZARCH=z15
+ endif
+ endif
+
+ Also check the 'UTAH' based (ISO) image testing (QA Tracker).
+ (Is the underlying system capable to execute the newly build binaries?).
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https://bugs.launchpad.net/bugs/2126577
Title:
[26.04 FEAT] Set Architecture Level (ALS) to z15
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