Provide an implementation of task_cpu_possible_mask() so that we can
prevent 64-bit-only cores being added to the 'cpus_mask' for compat
tasks on systems with mismatched 32-bit support at EL0,
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210730112443.23245-11-will@kernel.org
update_saved_ttbr0(tsk, next);
}
+static inline const struct cpumask *
+task_cpu_possible_mask(struct task_struct *p)
+{
+ if (!static_branch_unlikely(&arm64_mismatched_32bit_el0))
+ return cpu_possible_mask;
+
+ if (!is_compat_thread(task_thread_info(p)))
+ return cpu_possible_mask;
+
+ return system_32bit_el0_cpumask();
+}
+#define task_cpu_possible_mask task_cpu_possible_mask
+
void verify_cpu_asid_bits(void);
void post_ttbr_update_workaround(void);