PM: EM: Fix late boot with holes in CPU topology
authorChristian Loehle <christian.loehle@arm.com>
Sun, 31 Aug 2025 21:43:57 +0000 (22:43 +0100)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Mon, 15 Sep 2025 10:02:24 +0000 (12:02 +0200)
commit1ebe8f7e782523e62cd1fa8237f7afba5d1dae83
treed3e7b5721096e58af732d7079a3f68889123e765
parente0423541477dfb684fbc6e6b5386054bc650f264
PM: EM: Fix late boot with holes in CPU topology

Commit e3f1164fc9ee ("PM: EM: Support late CPUs booting and capacity
adjustment") added a mechanism to handle CPUs that come up late by
retrying when any of the `cpufreq_cpu_get()` call fails.

However, if there are holes in the CPU topology (offline CPUs, e.g.
nosmt), the first missing CPU causes the loop to break, preventing
subsequent online CPUs from being updated.

Instead of aborting on the first missing CPU policy, loop through all
and retry if any were missing.

Fixes: e3f1164fc9ee ("PM: EM: Support late CPUs booting and capacity adjustment")
Suggested-by: Kenneth Crudup <kenneth.crudup@gmail.com>
Reported-by: Kenneth Crudup <kenneth.crudup@gmail.com>
Link: https://lore.kernel.org/linux-pm/40212796-734c-4140-8a85-854f72b8144d@panix.com/
Cc: 6.9+ <stable@vger.kernel.org> # 6.9+
Signed-off-by: Christian Loehle <christian.loehle@arm.com>
Link: https://patch.msgid.link/20250831214357.2020076-1-christian.loehle@arm.com
[ rjw: Drop the new pr_debug() message which is not very useful ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
kernel/power/energy_model.c