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powerpc/topology: Check if a core is online

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[ Upstream commit 227bbaabe6 ]

topology_is_core_online() checks if the core a CPU belongs to
is online. The core is online if at least one of the sibling
CPUs is online. The first CPU of an online core is also online
in the common case, so this should be fairly quick.

Fixes: 73c58e7e14 ("powerpc: Add HOTPLUG_SMT support")
Signed-off-by: Nysal Jan K.A <nysal@linux.ibm.com>
Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240731030126.956210-3-nysal@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nysal Jan K.A 2024-07-31 08:31:13 +05:30 committed by Greg Kroah-Hartman
parent f17c3a37b2
commit 8555383730
1 changed files with 13 additions and 0 deletions
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13
arch/powerpc/include/asm/topology.h
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@ -145,6 +145,7 @@ static inline int cpu_to_coregroup_id(int cpu)
#ifdef CONFIG_HOTPLUG_SMT
#include <linux/cpu_smt.h>
#include <linux/cpumask.h>
#include <asm/cputhreads.h>
static inline bool topology_is_primary_thread(unsigned int cpu)
@ -156,6 +157,18 @@ static inline bool topology_smt_thread_allowed(unsigned int cpu)
{
return cpu_thread_in_core(cpu) < cpu_smt_num_threads;
}
#define topology_is_core_online topology_is_core_online
static inline bool topology_is_core_online(unsigned int cpu)
{
int i, first_cpu = cpu_first_thread_sibling(cpu);
for (i = first_cpu; i < first_cpu + threads_per_core; ++i) {
if (cpu_online(i))
return true;
}
return false;
}
#endif
#endif /* __KERNEL__ */