Besides a few bug fixes, the main bit in here is changing
sparc64's SMP code to take advantage of the &cpumask_of_cpu()
stuff we have now.
With one exception, the sparc64 cross-call code will now only work
with constant cpumask_t pointers, rather than using cpumask_t local
variables.
That exception is arch_send_call_function_ipi()' "mask" argument. I
would really like to see that interface pass in a constant cpumask_t
pointer too.
As I found when transforming the sparc64 code, the only way to get rid
of these function local cpumask_t variables is to put the "is it
online?" and "is it current cpu?" handling down in the cross-call
dispatch code itself. I think the generic SMP helper code should do
the same as well.
In fact the current:
cpu = smp_processor_id();
allbutself = cpu_online_map;
cpu_clear(cpu, allbutself);
cpus_and(mask, mask, allbutself);
construct in smp_call_function_mask() is very inefficient. Better
would be something like:
cpu = smp_processor_id();
cpu_clear(cpu, mask);
cpus_and(mask, mask, cpu_online_map);
which allows to eliminate the allbutself local variable entirely.
Please pull, thanks a lot!
The following changes since commit 8f616cd5249e03c9e1b371623d85e76d4b86bbc1:
Linus Torvalds (1):
Merge branch 'for_linus' of git://git.kernel.org/.../tytso/ext4
are available in the git repository at:
master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6.git master
David S. Miller (13):
sparc64: Need to disable preemption around smp_tsb_sync().
sparc64: Use function pointer for cross-call sending.
sparc64: Use xcall_deliver() consistently.
sparc64: Use cpumask_t pointers and for_each_cpu_mask_nr() in xcall_deliver.
sparc64: Call xcall_deliver() directly in some cases.
sparc64: Directly call xcall_deliver() in smp_start_sync_tick_client.
sparc64: Make smp_cross_call_masked() take a cpumask_t pointer.
sparc64: Always allocate the send mondo blocks, even on non-sun4v.
sparc64: Make all xcall_deliver's go through common helper function.
sparc64: Disable local interrupts around xcall_deliver_impl() invocation.
sparc64: Build cpu list and mondo block at top-level xcall_deliver().
sparc64: Kill error_mask from hypervisor_xcall_deliver().
sparc64: Remove all cpumask_t local variables in xcall dispatch.
Huang Weiyi (1):
arch/sparc64/kernel/signal.c: removed duplicated #include
arch/sparc64/kernel/irq.c | 19 +++-
arch/sparc64/kernel/signal.c | 1 -
arch/sparc64/kernel/smp.c | 292 +++++++++++++++++++++---------------------
arch/sparc64/mm/tsb.c | 5 +-
4 files changed, 166 insertions(+), 151 deletions(-)
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