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Fix Watchdog detected Hard LOCKUP when booting P9 #2

Closed liyi-ibm closed 6 years ago

liyi-ibm commented 6 years ago

The 4.14.24 kernel built from upstream linux-stable tree cannot boot on P9 (DD2.2) (after updating PNOR to 0315 version). We have to add powersave=off kernel option to boot the kernel.

After applying two patches mentioned in bug: https://bugzilla.linux.ibm.com/show_bug.cgi?id=165074, the 4.14.24 kernel can boot on P9-DD2.2+PNOR-0315. Backport two patchs from linux-ppc tree: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=5080332c2c893118dbc18755f35c8b0131cf0fc4 (from 4.15) https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=d075745d893c78730e4a3b7a60fca23c2f764081 (from 4.16)

liyi-ibm commented 6 years ago

The above two patches back ported to hostos-4.14.y branch： b5823717e76c6b93ab3040af93895e92d9197295 and 064e4f7105ee4d2945332b703d377d74fe4e6f40

liyi-ibm commented 6 years ago

Fixed and close with the release: https://github.com/liyi-ibm/linux/releases/tag/4.14.24-2.

liyi-ibm commented 6 years ago

https://bugzilla.linux.ibm.com/show_bug.cgi?id=164068 - this bug shows more details on the patch.