On 6/21/19 9:11 AM, Heiko Carstens wrote:
Hello Laura,
We're attempting to build stable kernels with gcc9. 4.19.x fails to build with gcc9 as 146448524bdd ("s390/jump_label: Use "jdd" constraint on gcc9") is missing. This doesn't apply cleanly to 4.19.x as it needs changes from 13ddb52c165b ("s390/jump_label: Switch to relative references")
Which is better, taking both 13ddb52c165b and 146448524bdd or doing a backport of 146448524bdd?
I don't know which kernel version you are referring to exactly, however 4.19.53 from linux-stable does not contain the common code infrastructure for relative jump labels. The infrastructure was merged with 4.20: commit 50ff18ab497aa ("jump_label: Implement generic support for relative references").
Therefore a backport of only 146448524bdd seems to be the way to go.
Ah okay, I didn't realize there was more needed, I was just looking at the clean cherry-pick. I'm not sure how to do the backport, if you give me the patch I can verify.
Thanks, Laura