BMC/Intel-BMC/linux.git/arch/ia64/kernel/irq.c, branch dev

ia64: Replace __get_cpu_var uses

2014-08-26T17:45:52+00:00

__get_cpu_var() is used for multiple purposes in the kernel source. One of them is address calculation via the form &__get_cpu_var(x). This calculates the address for the instance of the percpu variable of the current processor based on an offset. Other use cases are for storing and retrieving data from the current processors percpu area. __get_cpu_var() can be used as an lvalue when writing data or on the right side of an assignment. __get_cpu_var() is defined as : #define __get_cpu_var(var) (*this_cpu_ptr(&(var))) __get_cpu_var() always only does an address determination. However, store and retrieve operations could use a segment prefix (or global register on other platforms) to avoid the address calculation. this_cpu_write() and this_cpu_read() can directly take an offset into a percpu area and use optimized assembly code to read and write per cpu variables. This patch converts __get_cpu_var into either an explicit address calculation using this_cpu_ptr() or into a use of this_cpu operations that use the offset. Thereby address calculations are avoided and less registers are used when code is generated. At the end of the patch set all uses of __get_cpu_var have been removed so the macro is removed too. The patch set includes passes over all arches as well. Once these operations are used throughout then specialized macros can be defined in non -x86 arches as well in order to optimize per cpu access by f.e. using a global register that may be set to the per cpu base. Transformations done to __get_cpu_var() 1. Determine the address of the percpu instance of the current processor. DEFINE_PER_CPU(int, y); int *x = &__get_cpu_var(y); Converts to int *x = this_cpu_ptr(&y); 2. Same as #1 but this time an array structure is involved. DEFINE_PER_CPU(int, y[20]); int *x = __get_cpu_var(y); Converts to int *x = this_cpu_ptr(y); 3. Retrieve the content of the current processors instance of a per cpu variable. DEFINE_PER_CPU(int, y); int x = __get_cpu_var(y) Converts to int x = __this_cpu_read(y); 4. Retrieve the content of a percpu struct DEFINE_PER_CPU(struct mystruct, y); struct mystruct x = __get_cpu_var(y); Converts to memcpy(&x, this_cpu_ptr(&y), sizeof(x)); 5. Assignment to a per cpu variable DEFINE_PER_CPU(int, y) __get_cpu_var(y) = x; Converts to __this_cpu_write(y, x); 6. Increment/Decrement etc of a per cpu variable DEFINE_PER_CPU(int, y); __get_cpu_var(y)++ Converts to __this_cpu_inc(y) Cc: Tony Luck Cc: Fenghua Yu Cc: linux-ia64@vger.kernel.org Signed-off-by: Christoph Lameter Signed-off-by: Tejun Heo

Fix initialization of CMCI/CMCP interrupts

2013-04-02T16:37:06+00:00

Back 2010 during a revamp of the irq code some initializations were moved from ia64_mca_init() to ia64_mca_late_init() in commit c75f2aa13f5b268aba369b5dc566088b5194377c Cannot use register_percpu_irq() from ia64_mca_init() But this was hideously wrong. First of all these initializations are now down far too late. Specifically after all the other cpus have been brought up and initialized their own CMC vectors from smp_callin(). Also ia64_mca_late_init() may be called from any cpu so the line: ia64_mca_cmc_vector_setup(); /* Setup vector on BSP */ is generally not executed on the BSP, and so the CMC vector isn't setup at all on that processor. Make use of the arch_early_irq_init() hook to get this code executed at just the right moment: not too early, not too late. Reported-by: Fred Hartnett Tested-by: Fred Hartnett Cc: stable@kernel.org # v2.6.37+ Signed-off-by: Tony Luck

ia64: Use generic show_interrupts()

2011-03-29T12:48:05+00:00

Signed-off-by: Thomas Gleixner

ia64: Use irqd_irq_disabled() instead of desc->status access

2011-03-29T12:48:04+00:00

Remove the last open coded access to irq_desc. Signed-off-by: Thomas Gleixner

ia64: Use accessor functions all over the place

2011-03-29T12:48:03+00:00

Use the proper accessor functions instead of open coded irq_desc access. Signed-off-by: Thomas Gleixner

ia64: Cleanup migrate_irqs()

2011-03-29T12:48:00+00:00

Signed-off-by: Thomas Gleixner

genirq: Convert irq_desc.lock to raw_spinlock

2009-12-14T22:55:33+00:00

Convert locks which cannot be sleeping locks in preempt-rt to raw_spinlocks. Signed-off-by: Thomas Gleixner Acked-by: Peter Zijlstra Acked-by: Ingo Molnar

[IA64] remove obsolete irq_desc_t typedef

2009-06-15T21:34:31+00:00

The defines and typedefs (hw_interrupt_type, no_irq_type, irq_desc_t) have been kept around for migration reasons. After more than two years it's time to remove them finally. This patch cleans up one of the remaining users. When all such patches hit mainline we can remove the defines and typedefs finally. Impact: cleanup Convert the last remaining users and remove the typedef. Signed-off-by: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Tony Luck

Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2

2009-03-27T16:28:43+00:00

Conflicts: arch/parisc/kernel/irq.c arch/x86/include/asm/fixmap_64.h arch/x86/include/asm/setup.h kernel/irq/handle.c Semantic merge: arch/x86/include/asm/fixmap.h Signed-off-by: Ingo Molnar

irq: update all arches for new irq_desc

2009-01-12T23:27:13+00:00

Impact: cleanup, update to new cpumask API Irq_desc.affinity and irq_desc.pending_mask are now cpumask_var_t's so access to them should be using the new cpumask API. Signed-off-by: Mike Travis