kernel/git/stable/linux-stable.git/lib/cpumask.c, branch linux-2.6.33.y

x86: remove some alloc_bootmem_cpumask_var calling

2009-06-11T16:27:07+00:00

Now that we set up the slab allocator earlier, we can get rid of some alloc_bootmem_cpumask_var() calls in boot code. Cc: Ingo Molnar Cc: Johannes Weiner Cc: Linus Torvalds Signed-off-by: Yinghai Lu Signed-off-by: Pekka Enberg

cpumask: introduce zalloc_cpumask_var

2009-06-09T13:00:26+00:00

So can get cpumask_var with cpumask_clear Signed-off-by: Yinghai Lu Signed-off-by: Rusty Russell

cpumask: fix slab corruption caused by alloc_cpumask_var_node()

2009-04-03T02:05:11+00:00

Fix slab corruption caused by alloc_cpumask_var_node() overwriting the tail end of an off-stack cpumask. The function zeros out cpumask bits beyond the last possible cpu. The starting point for zeroing should be the beginning of the mask offset by a byte count derived from the number of possible cpus. The offset was calculated in bits instead of bytes. This resulted in overwriting the end of the cpumask. Signed-off-by: Jack Steiner Acked-by: Mike Travis Acked-by: Ingo Molnar Cc: Rusty Russell Cc: Stephen Rothwell Cc: [2.6.29.x] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

cpumask: zero extra bits in alloc_cpumask_var_node

2008-12-31T23:42:30+00:00

Impact: extra safety checks during transition When CONFIG_CPUMASKS_OFFSTACK is set, the new cpumask_ operators only use bits up to nr_cpu_ids, not NR_CPUS. Using the old cpus_ operators on these masks can mean accessing undefined bits. After some discussion, Mike and I decided to err on the side of caution; we zero the "undefined" bits in alloc_cpumask_var_node() until all the old cpumask functions are removed. Signed-off-by: Rusty Russell

cpumask: fix bogus kernel-doc

2008-12-31T23:42:13+00:00

Impact: fix kernel-doc alloc_bootmem_cpumask_var() returns avoid. Signed-off-by: Li Zefan Signed-off-by: Rusty Russell

cpumask: documentation for cpumask_var_t

2008-12-19T06:26:52+00:00

Impact: New kerneldoc comments Additional documentation added to all the alloc_cpumask and free_cpumask functions. Signed-off-by: Mike Travis Signed-off-by: Rusty Russell (minor additions)

cpumask: Add alloc_cpumask_var_node()

2008-12-19T06:26:37+00:00

Impact: New API This will be needed in x86 code to allocate the domain and old_domain cpumasks on the same node as where the containing irq_cfg struct is allocated. (Also fixes double-dump_stack on rare CONFIG_DEBUG_PER_CPU_MAPS case) Signed-off-by: Mike Travis Signed-off-by: Rusty Russell (re-impl alloc_cpumask_var)

cpumask: introduce new API, without changing anything, v3

2008-11-09T20:09:54+00:00

Impact: cleanup Clean up based on feedback from Andrew Morton and others: - change to inline functions instead of macros - add __init to bootmem method - add a missing debug check Signed-off-by: Rusty Russell Signed-off-by: Ingo Molnar

cpumask: new API, v2

2008-11-07T11:52:30+00:00

- add cpumask_of() - add free_bootmem_cpumask_var() Signed-off-by: Rusty Russell Signed-off-by: Ingo Molnar

cpumask: introduce new API, without changing anything

2008-11-06T08:05:33+00:00

Impact: introduce new APIs We want to deprecate cpumasks on the stack, as we are headed for gynormous numbers of CPUs. Eventually, we want to head towards an undefined 'struct cpumask' so they can never be declared on stack. 1) New cpumask functions which take pointers instead of copies. (cpus_* -> cpumask_*) 2) Several new helpers to reduce requirements for temporary cpumasks (cpumask_first_and, cpumask_next_and, cpumask_any_and) 3) Helpers for declaring cpumasks on or offstack for large NR_CPUS (cpumask_var_t, alloc_cpumask_var and free_cpumask_var) 4) 'struct cpumask' for explicitness and to mark new-style code. 5) Make iterator functions stop at nr_cpu_ids (a runtime constant), not NR_CPUS for time efficiency and for smaller dynamic allocations in future. 6) cpumask_copy() so we can allocate less than a full cpumask eventually (for alloc_cpumask_var), and so we can eliminate the 'struct cpumask' definition eventually. 7) work_on_cpu() helper for doing task on a CPU, rather than saving old cpumask for current thread and manipulating it. 8) smp_call_function_many() which is smp_call_function_mask() except taking a cpumask pointer. Note that this patch simply introduces the new functions and leaves the obsolescent ones in place. This is to simplify the transition patches. Signed-off-by: Rusty Russell Signed-off-by: Ingo Molnar