Messages in this thread Patch in this message | | | From | Matthias Kaehlcke <> | Subject | [PATCH v2 1/2] cpumask: Add helper cpumask_available() | Date | Wed, 12 Apr 2017 11:20:29 -0700 |
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With CONFIG_CPUMASK_OFFSTACK=y cpumask_var_t is a struct cpumask pointer, otherwise a struct cpumask array with a single element.
Some code dealing with cpumasks needs to validate that a cpumask_var_t is not a NULL pointer when CONFIG_CPUMASK_OFFSTACK=y. This is typically done by performing the check always, regardless of the underlying type of cpumask_var_t. This works in both cases, however clang raises a warning like this when CONFIG_CPUMASK_OFFSTACK=n:
kernel/irq/manage.c:839:28: error: address of array 'desc->irq_common_data.affinity' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
Add the inline helper cpumask_available() which only performs the pointer check if CONFIG_CPUMASK_OFFSTACK=y.
Signed-off-by: Matthias Kaehlcke <mka@chromium.org> --- Changes in v2: - Patch added
include/linux/cpumask.h | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index 96f1e88b767c..1a675604b17d 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -667,6 +667,11 @@ void alloc_bootmem_cpumask_var(cpumask_var_t *mask); void free_cpumask_var(cpumask_var_t mask); void free_bootmem_cpumask_var(cpumask_var_t mask); +static inline bool cpumask_available(cpumask_var_t mask) +{ + return mask != NULL; +} + #else typedef struct cpumask cpumask_var_t[1]; @@ -708,6 +713,11 @@ static inline void free_cpumask_var(cpumask_var_t mask) static inline void free_bootmem_cpumask_var(cpumask_var_t mask) { } + +static inline bool cpumask_available(cpumask_var_t mask) +{ + return true; +} #endif /* CONFIG_CPUMASK_OFFSTACK */ /* It's common to want to use cpu_all_mask in struct member initializers, -- 2.12.2.715.g7642488e1d-goog
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