kernel.git/arch/powerpc/kernel/irq.c, branch linux-2.6.28.y

powerpc: Make the irq reverse mapping radix tree lockless

2008-09-15T18:08:45Z

The radix trees used by interrupt controllers for their irq reverse mapping (currently only the XICS found on pSeries) have a complex locking scheme dating back to before the advent of the lockless radix tree. This takes advantage of the lockless radix tree and of the fact that the items of the tree are pointers to a static array (irq_map) elements which can never go under us to simplify the locking. Concurrency between readers and writers is handled by the intrinsic properties of the lockless radix tree. Concurrency between writers is handled with a global mutex. Signed-off-by: Sebastien Dugue Cc: Benjamin Herrenschmidt Cc: Michael Ellerman Signed-off-by: Paul Mackerras

powerpc: Separate the irq radix tree insertion and lookup

2008-09-15T18:08:44Z

irq_radix_revmap() currently serves 2 purposes, irq mapping lookup and insertion which happen in interrupt and process context respectively. Separate the function into its 2 components, one for lookup only and one for insertion only. Fix the only user of the revmap tree (XICS) to use the new functions. Also, move the insertion into the radix tree of those irqs that were requested before it was initialized at said tree initialization. Mutual exclusion between the tree initialization and readers/writers is handled via a state variable (revmap_trees_allocated) set to 1 when the tree has been initialized and set to 2 after the already requested irqs have been inserted in the tree by the init path. This state is checked before any reader or writer access just like we used to check for tree.gfp_mask != 0 before. Finally, now that we're not any longer inserting nodes into the radix-tree in interrupt context, turn the GFP_ATOMIC allocations into GFP_KERNEL ones. Signed-off-by: Sebastien Dugue Cc: Benjamin Herrenschmidt Cc: Michael Ellerman Signed-off-by: Paul Mackerras

powerpc: Remove use of CONFIG_PPC_MERGE

2008-08-04T03:18:17Z

Now that arch/ppc is gone and CONFIG_PPC_MERGE is always set, remove the dead code associated with !CONFIG_PPC_MERGE from arch/powerpc and include/asm-powerpc. Signed-off-by: Kumar Gala Signed-off-by: Paul Mackerras

Merge commit '85082fd7cbe3173198aac0eb5e85ab1edcc6352c' into test-build

2008-07-15T05:44:51Z

Manual fixup of: arch/powerpc/Kconfig

Merge branch 'linux-2.6'

2008-06-30T00:16:50Z

Merge branch 'linus' into tracing/ftrace

2008-06-23T09:11:42Z

[POWERPC] Fix return value check logic in debugfs virq_mapping setup

2008-06-16T05:00:25Z

debugfs_create_file() returns a non-NULL (non-zero) value in case of success, not a NULL value. This fixes this non-critical boot-time debugging error message: [ 1.316386] calling irq_debugfs_init+0x0/0x50 [ 1.316399] initcall irq_debugfs_init+0x0/0x50 returned -12 after 0 msecs [ 1.316411] initcall irq_debugfs_init+0x0/0x50 returned with error code -12 Signed-off-by: Emil Medve Acked-by: Michael Ellerman Signed-off-by: Paul Mackerras

powerpc: Fix irq_alloc_host() reference counting and callers

2008-06-09T03:51:16Z

When I changed irq_alloc_host() to take an of_node (52964f87c64e6c6ea671b5bf3030fb1494090a48: "Add an optional device_node pointer to the irq_host"), I botched the reference counting semantics. Stephen pointed out that it's irq_alloc_host()'s business if it needs to take an additional reference to the device_node, the caller shouldn't need to care. Signed-off-by: Michael Ellerman Signed-off-by: Paul Mackerras

[POWERPC] Move to runtime allocated exception stacks

2008-06-02T19:54:42Z

For the additonal exception levels (critical, debug, machine check) on 40x/book-e we were using "static" allocations of the stack in the associated head.S. Move to a runtime allocation to make the code a bit easier to read as we mimic how we handle IRQ stacks. Its also a bit easier to setup the stack with a "dummy" thread_info in C code. Signed-off-by: Kumar Gala Acked-by: Paul Mackerras

ftrace: support for PowerPC

2008-05-23T20:43:11Z

This patch adds full support for ftrace for PowerPC (both 64 and 32 bit). This includes dynamic tracing and function filtering. Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner