From 7b4967c532045a1983d6d4af5c69cc7c5109f62b Mon Sep 17 00:00:00 2001 From: Mike Travis Date: Fri, 19 Dec 2008 16:56:37 +1030 Subject: cpumask: Add alloc_cpumask_var_node() 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) --- lib/cpumask.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'lib/cpumask.c') diff --git a/lib/cpumask.c b/lib/cpumask.c index 8d03f22c6ced..3f258f58c85b 100644 --- a/lib/cpumask.c +++ b/lib/cpumask.c @@ -76,15 +76,14 @@ int cpumask_any_but(const struct cpumask *mask, unsigned int cpu) /* These are not inline because of header tangles. */ #ifdef CONFIG_CPUMASK_OFFSTACK -bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) +bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) { if (likely(slab_is_available())) - *mask = kmalloc(cpumask_size(), flags); + *mask = kmalloc_node(cpumask_size(), flags, node); else { #ifdef CONFIG_DEBUG_PER_CPU_MAPS printk(KERN_ERR "=> alloc_cpumask_var: kmalloc not available!\n"); - dump_stack(); #endif *mask = NULL; } @@ -96,6 +95,12 @@ bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) #endif return *mask != NULL; } +EXPORT_SYMBOL(alloc_cpumask_var_node); + +bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) +{ + return alloc_cpumask_var_node(mask, flags, numa_node_id()); +} EXPORT_SYMBOL(alloc_cpumask_var); void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask) -- cgit v1.2.3 From ec26b805879c7e77865b39ee91b737985e80006d Mon Sep 17 00:00:00 2001 From: Mike Travis Date: Fri, 19 Dec 2008 16:56:52 +1030 Subject: cpumask: documentation for cpumask_var_t 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) --- lib/cpumask.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) (limited to 'lib/cpumask.c') diff --git a/lib/cpumask.c b/lib/cpumask.c index 3f258f58c85b..a24edf137f41 100644 --- a/lib/cpumask.c +++ b/lib/cpumask.c @@ -76,6 +76,20 @@ int cpumask_any_but(const struct cpumask *mask, unsigned int cpu) /* These are not inline because of header tangles. */ #ifdef CONFIG_CPUMASK_OFFSTACK +/** + * alloc_cpumask_var_node - allocate a struct cpumask on a given node + * @mask: pointer to cpumask_var_t where the cpumask is returned + * @flags: GFP_ flags + * + * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is + * a nop returning a constant 1 (in ) + * Returns TRUE if memory allocation succeeded, FALSE otherwise. + * + * In addition, mask will be NULL if this fails. Note that gcc is + * usually smart enough to know that mask can never be NULL if + * CONFIG_CPUMASK_OFFSTACK=n, so does code elimination in that case + * too. + */ bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) { if (likely(slab_is_available())) @@ -97,23 +111,52 @@ bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) } EXPORT_SYMBOL(alloc_cpumask_var_node); +/** + * alloc_cpumask_var - allocate a struct cpumask + * @mask: pointer to cpumask_var_t where the cpumask is returned + * @flags: GFP_ flags + * + * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is + * a nop returning a constant 1 (in ). + * + * See alloc_cpumask_var_node. + */ bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) { return alloc_cpumask_var_node(mask, flags, numa_node_id()); } EXPORT_SYMBOL(alloc_cpumask_var); +/** + * alloc_bootmem_cpumask_var - allocate a struct cpumask from the bootmem arena. + * @mask: pointer to cpumask_var_t where the cpumask is returned + * + * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is + * a nop returning a constant 1 (in ) + * Either returns an allocated (zero-filled) cpumask, or causes the + * system to panic. + */ void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask) { *mask = alloc_bootmem(cpumask_size()); } +/** + * free_cpumask_var - frees memory allocated for a struct cpumask. + * @mask: cpumask to free + * + * This is safe on a NULL mask. + */ void free_cpumask_var(cpumask_var_t mask) { kfree(mask); } EXPORT_SYMBOL(free_cpumask_var); +/** + * free_bootmem_cpumask_var - frees result of alloc_bootmem_cpumask_var + * @mask: cpumask to free + */ void __init free_bootmem_cpumask_var(cpumask_var_t mask) { free_bootmem((unsigned long)mask, cpumask_size()); -- cgit v1.2.3 From e9690a6e4b1615cb0102e425e04b7ce29e7858e2 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Wed, 31 Dec 2008 16:45:50 +0800 Subject: cpumask: fix bogus kernel-doc Impact: fix kernel-doc alloc_bootmem_cpumask_var() returns avoid. Signed-off-by: Li Zefan Signed-off-by: Rusty Russell --- lib/cpumask.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'lib/cpumask.c') diff --git a/lib/cpumask.c b/lib/cpumask.c index a24edf137f41..8e1496cb63f7 100644 --- a/lib/cpumask.c +++ b/lib/cpumask.c @@ -132,7 +132,7 @@ EXPORT_SYMBOL(alloc_cpumask_var); * @mask: pointer to cpumask_var_t where the cpumask is returned * * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is - * a nop returning a constant 1 (in ) + * a nop (in ). * Either returns an allocated (zero-filled) cpumask, or causes the * system to panic. */ -- cgit v1.2.3 From 2a53008033189ed09bfe241c6b33811ba4ce980d Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Thu, 1 Jan 2009 10:12:30 +1030 Subject: cpumask: zero extra bits in alloc_cpumask_var_node 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 --- lib/cpumask.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'lib/cpumask.c') diff --git a/lib/cpumask.c b/lib/cpumask.c index 8e1496cb63f7..3389e2440da0 100644 --- a/lib/cpumask.c +++ b/lib/cpumask.c @@ -107,6 +107,14 @@ bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) dump_stack(); } #endif + /* FIXME: Bandaid to save us from old primitives which go to NR_CPUS. */ + if (*mask) { + unsigned int tail; + tail = BITS_TO_LONGS(NR_CPUS - nr_cpumask_bits) * sizeof(long); + memset(cpumask_bits(*mask) + cpumask_size() - tail, + 0, tail); + } + return *mask != NULL; } EXPORT_SYMBOL(alloc_cpumask_var_node); -- cgit v1.2.3