Subject: local-vars-migrate-disable.patch From: Thomas Gleixner Date: Tue, 28 Jun 2011 20:42:16 +0200 Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/patches-3.12.0-rt2.tar.xz Signed-off-by: Thomas Gleixner --- include/linux/percpu.h | 28 ++++++++++++++++++++++++---- 1 file changed, 24 insertions(+), 4 deletions(-) --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -48,10 +48,30 @@ preempt_enable(); \ } while (0) -#define get_local_var(var) get_cpu_var(var) -#define put_local_var(var) put_cpu_var(var) -#define get_local_ptr(var) get_cpu_ptr(var) -#define put_local_ptr(var) put_cpu_ptr(var) +#ifndef CONFIG_PREEMPT_RT_FULL +# define get_local_var(var) get_cpu_var(var) +# define put_local_var(var) put_cpu_var(var) +# define get_local_ptr(var) get_cpu_ptr(var) +# define put_local_ptr(var) put_cpu_ptr(var) +#else +# define get_local_var(var) (*({ \ + migrate_disable(); \ + &__get_cpu_var(var); })) + +# define put_local_var(var) do { \ + (void)&(var); \ + migrate_enable(); \ +} while (0) + +# define get_local_ptr(var) ({ \ + migrate_disable(); \ + this_cpu_ptr(var); }) + +# define put_local_ptr(var) do { \ + (void)(var); \ + migrate_enable(); \ +} while (0) +#endif /* minimum unit size, also is the maximum supported allocation size */ #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10)