[Bug 2126577] Re: [26.04 FEAT] Set Architecture Level (ALS) to z15

[Frank Heimes]

** 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'}>
  
- (I am not sure yet, but assume that gcc-15 will still be the default
- also in 26.04.)
+ 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

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to ubuntu-release-upgrader in
Ubuntu.
https://bugs.launchpad.net/bugs/2126577

Title:
  [26.04 FEAT] Set Architecture Level (ALS) to z15

Status in Ubuntu on IBM z Systems:
  Fix Committed
Status in gcc-15 package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  Fix Committed
Status in llvm-toolchain-20 package in Ubuntu:
  Fix Released
Status in llvm-toolchain-21 package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-z-systems/+bug/2126577/+subscriptions