kernel.git/kernel/irq/handle.c, branch linux-2.6.34.y

random: make 'add_interrupt_randomness()' do something sane

2012-08-17T19:36:05Z

commit 775f4b297b780601e61787b766f306ed3e1d23eb upstream. We've been moving away from add_interrupt_randomness() for various reasons: it's too expensive to do on every interrupt, and flooding the CPU with interrupts could theoretically cause bogus floods of entropy from a somewhat externally controllable source. This solves both problems by limiting the actual randomness addition to just once a second or after 64 interrupts, whicever comes first. During that time, the interrupt cycle data is buffered up in a per-cpu pool. Also, we make sure the the nonblocking pool used by urandom is initialized before we start feeding the normal input pool. This assures that /dev/urandom is returning unpredictable data as soon as possible. (Based on an original patch by Linus, but significantly modified by tytso.) Tested-by: Eric Wustrow Reported-by: Eric Wustrow Reported-by: Nadia Heninger Reported-by: Zakir Durumeric Reported-by: J. Alex Halderman . Signed-off-by: Linus Torvalds Signed-off-by: "Theodore Ts'o" [PG: minor adjustment required since .34 doesn't have f9e4989eb8 which renames "status" to "random" in kernel/irq/handle.c ] Signed-off-by: Paul Gortmaker

sparseirq: Use radix_tree instead of ptrs array

2010-02-18T01:27:20Z

Use radix_tree irq_desc_tree instead of irq_desc_ptrs. -v2: according to Eric and cyrill to use radix_tree_lookup_slot and radix_tree_replace_slot Signed-off-by: Yinghai Lu LKML-Reference: <1265793639-15071-32-git-send-email-yinghai@kernel.org> Signed-off-by: H. Peter Anvin

sparseirq: Change irq_desc_ptrs to static

2010-02-18T01:27:03Z

Add replace_irq_desc() instead of poking at the array directly. -v2: remove unneeded boundary check in replace_irq_desc Signed-off-by: Yinghai Lu LKML-Reference: <1265793639-15071-31-git-send-email-yinghai@kernel.org> Signed-off-by: H. Peter Anvin

irq: Remove unnecessary bootmem code

2010-02-18T01:23:59Z

mem_init is moved early already. Signed-off-by: Yinghai Lu LKML-Reference: <1265793639-15071-29-git-send-email-yinghai@kernel.org> Signed-off-by: H. Peter Anvin

genirq: Convert irq_desc.lock to raw_spinlock

2009-12-14T22:55:33Z

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

headers: remove sched.h from interrupt.h

2009-10-11T18:20:58Z

After m68k's task_thread_info() doesn't refer to current, it's possible to remove sched.h from interrupt.h and not break m68k! Many thanks to Heiko Carstens for allowing this. Signed-off-by: Alexey Dobriyan

irq: Make sure irq_desc for legacy irq get correct node setting

2009-08-29T13:53:00Z

when there is no ram on node 0. Signed-off-by: Yinghai Lu Cc: Andrew Morton Cc: Jesse Barnes LKML-Reference: <4A95C32D.5040605@kernel.org> Signed-off-by: Ingo Molnar

irq: slab alloc for default irq_affinity

2009-06-12T10:50:23Z

Ingo had [ 0.000000] ------------[ cut here ]------------ [ 0.000000] WARNING: at mm/bootmem.c:537 alloc_arch_preferred_bootmem+0x2b/0x71() [ 0.000000] Hardware name: System Product Name [ 0.000000] Modules linked in: [ 0.000000] Pid: 0, comm: swapper Tainted: G W 2.6.30-tip-03087-g0bb2618-dirty #52506 [ 0.000000] Call Trace: [ 0.000000] [<81032588>] warn_slowpath_common+0x60/0x90 [ 0.000000] [<810325c5>] warn_slowpath_null+0xd/0x10 [ 0.000000] [<819d1bc0>] alloc_arch_preferred_bootmem+0x2b/0x71 [ 0.000000] [<819d1c31>] ___alloc_bootmem_nopanic+0x2b/0x9a [ 0.000000] [<81050a0a>] ? lock_release+0xac/0xb2 [ 0.000000] [<819d1d4c>] ___alloc_bootmem+0xe/0x2d [ 0.000000] [<819d1e9f>] __alloc_bootmem+0xa/0xc [ 0.000000] [<819d7c63>] alloc_bootmem_cpumask_var+0x21/0x26 [ 0.000000] [<819d0cc8>] early_irq_init+0x15/0x10d [ 0.000000] [<819bb75a>] start_kernel+0x167/0x326 [ 0.000000] [<819bb06b>] __init_begin+0x6b/0x70 [ 0.000000] ---[ end trace 4eaa2a86a8e2da23 ]--- [ 0.000000] NR_IRQS:2304 nr_irqs:424 [ 0.000000] CPU 0 irqstacks, hard=821e6000 soft=821e7000 we need to update init_irq_default_affinity Signed-off-by: Yinghai Lu Signed-off-by: Pekka Enberg

irq: use kcalloc() instead of the bootmem allocator

2009-06-11T16:27:13Z

Fixes the following problem: [ 0.000000] Experimental hierarchical RCU init done. [ 0.000000] NR_IRQS:4352 nr_irqs:256 [ 0.000000] ------------[ cut here ]------------ [ 0.000000] WARNING: at mm/bootmem.c:537 alloc_arch_preferred_bootmem+0x40/0x7e() [ 0.000000] Hardware name: To Be Filled By O.E.M. [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.30-tip-02161-g7a74539-dirty #59709 [ 0.000000] Call Trace: [ 0.000000] [] ? alloc_arch_preferred_bootmem+0x40/0x7e [ 0.000000] [] warn_slowpath_common+0x88/0xcb [ 0.000000] [] warn_slowpath_null+0x27/0x3d [ 0.000000] [] alloc_arch_preferred_bootmem+0x40/0x7e [ 0.000000] [] ___alloc_bootmem_nopanic+0x4e/0xec [ 0.000000] [] ___alloc_bootmem+0x20/0x61 [ 0.000000] [] __alloc_bootmem+0x1e/0x34 [ 0.000000] [] early_irq_init+0x6d/0x118 [ 0.000000] [] ? early_idt_handler+0x0/0x71 [ 0.000000] [] start_kernel+0x192/0x394 [ 0.000000] [] ? early_idt_handler+0x0/0x71 [ 0.000000] [] x86_64_start_reservations+0xb4/0xcf [ 0.000000] [] ? __init_begin+0x0/0x140 [ 0.000000] [] x86_64_start_kernel+0x158/0x17b [ 0.000000] ---[ end trace a7919e7f17c0a725 ]--- [ 0.000000] Fast TSC calibration using PIT [ 0.000000] Detected 2002.510 MHz processor. [ 0.004000] Console: colour VGA+ 80x25 Reported-by: Ingo Molnar Signed-off-by: Pekka Enberg

irq/cpumask: make memoryless node zero happy

2009-06-11T16:27:08Z

Don't hardcode to node zero for early boot IRQ setup memory allocations. [ penberg@cs.helsinki.fi: minor cleanups ] Cc: Ingo Molnar Cc: Johannes Weiner Cc: Linus Torvalds Signed-off-by: Yinghai Lu Signed-off-by: Pekka Enberg