6.17-stable review patch. If anyone has any objections, please let me know.
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From: Gautham R. Shenoy gautham.shenoy@amd.com
[ Upstream commit 4fe5934db4a7187d358f1af1b3ef9b6dd59bce58 ]
Commit 279f838a61f9 ("x86/amd: Detect preferred cores in amd_get_boost_ratio_numerator()") introduced the ability to detect the preferred core on AMD platforms by checking if there at least two distinct highest_perf values.
However, it uses for_each_present_cpu() to iterate through all the CPUs in the platform, which is problematic when the kernel is booted with "nosmt=force" commandline option.
Hence limit the search to only the online CPUs.
Fixes: 279f838a61f9 ("x86/amd: Detect preferred cores in amd_get_boost_ratio_numerator()") Reported-by: Christopher Harris chris.harris79@gmail.com Closes: https://lore.kernel.org/lkml/CAM+eXpdDT7KjLV0AxEwOLkSJ2QtrsvGvjA2cCHvt1d0k2_... Reviewed-by: "Mario Limonciello (AMD) (kernel.org)" superm1@kernel.org Tested-by: Chrisopher Harris chris.harris79@gmail.com Signed-off-by: Gautham R. Shenoy gautham.shenoy@amd.com Link: https://patch.msgid.link/20251107074145.2340-2-gautham.shenoy@amd.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/kernel/acpi/cppc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/acpi/cppc.c b/arch/x86/kernel/acpi/cppc.c index 7047124490f64..d7c8ef1e354d3 100644 --- a/arch/x86/kernel/acpi/cppc.c +++ b/arch/x86/kernel/acpi/cppc.c @@ -196,7 +196,7 @@ int amd_detect_prefcore(bool *detected) break; }
- for_each_present_cpu(cpu) { + for_each_online_cpu(cpu) { u32 tmp; int ret;