[PATCH] powerpc: Set nr_cpu_ids early and use it to free PACAs
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2011-04-01 04:47:23
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
From: Ryan Grimm <redacted> Without this, "holes" in the CPU numbering can cause us to free too many PACAs Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> --- arch/powerpc/kernel/paca.c | 2 +- arch/powerpc/kernel/setup-common.c | 3 +++ 2 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index f4adf89..10f0aad 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c@@ -203,7 +203,7 @@ void __init free_unused_pacas(void) { int new_size; - new_size = PAGE_ALIGN(sizeof(struct paca_struct) * num_possible_cpus()); + new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids); if (new_size >= paca_size) return;
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 9d4882a..21f30cb 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c@@ -509,6 +509,9 @@ void __init smp_setup_cpu_maps(void) */ cpu_init_thread_core_maps(nthreads); + /* Now that possible cpus are set, set nr_cpu_ids for later use */ + nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1; + free_unused_pacas(); } #endif /* CONFIG_SMP */