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author | James Hogan <james.hogan@imgtec.com> | 2015-09-15 22:19:04 +0100 |
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committer | James Hogan <james.hogan@imgtec.com> | 2015-09-15 22:52:47 +0100 |
commit | 928df02bd46e2fe02cfd3127ba1814796d6d80b0 (patch) | |
tree | 7a5bcb900b44470941c6bad741522d5b606a3069 /arch/metag | |
parent | 6ff33f3902c3b1c5d0db6b1e2c70b6d76fba357f (diff) | |
download | linux-928df02bd46e2fe02cfd3127ba1814796d6d80b0.tar.gz linux-928df02bd46e2fe02cfd3127ba1814796d6d80b0.tar.bz2 linux-928df02bd46e2fe02cfd3127ba1814796d6d80b0.zip |
metag: SMP: Fix 4KiB stack setup on secondary CPUs
Back in early 2008, 4KiB stack support was added to reduce memory
consumption on workloads with lots of threads, using a separate IRQ
stack per CPU to alleviate stack pressure. However the SMP code added a
year and a half later didn't set up the IRQ stack when bringing up
secondary CPUs, resulting in a crash when SMP is configured with 4KiB
stacks, as soon as the first interrupt arrived on a secondary CPU.
Fix with calls to irq_ctx_exit()/irq_ctx_exit() when bringing up/down a
CPU.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
Diffstat (limited to 'arch/metag')
-rw-r--r-- | arch/metag/kernel/smp.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/metag/kernel/smp.c b/arch/metag/kernel/smp.c index ac3a199e33e7..c3c6f0864881 100644 --- a/arch/metag/kernel/smp.c +++ b/arch/metag/kernel/smp.c @@ -312,6 +312,7 @@ void cpu_die(void) { local_irq_disable(); idle_task_exit(); + irq_ctx_exit(smp_processor_id()); (void)cpu_report_death(); @@ -366,6 +367,7 @@ asmlinkage void secondary_start_kernel(void) panic("No TBI found!"); per_cpu_trap_init(cpu); + irq_ctx_init(cpu); preempt_disable(); |