| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef __LINUX_CACHE_H |
| 2 | #define __LINUX_CACHE_H |
| 3 | |
| Joe Perches | c28aa1f | 2014-01-23 15:54:16 -0800 | [diff] [blame] | 4 | #include <uapi/linux/kernel.h> |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | #include <asm/cache.h> |
| 6 | |
| 7 | #ifndef L1_CACHE_ALIGN |
| Joe Perches | c28aa1f | 2014-01-23 15:54:16 -0800 | [diff] [blame] | 8 | #define L1_CACHE_ALIGN(x) __ALIGN_KERNEL(x, L1_CACHE_BYTES) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #endif |
| 10 | |
| 11 | #ifndef SMP_CACHE_BYTES |
| 12 | #define SMP_CACHE_BYTES L1_CACHE_BYTES |
| 13 | #endif |
| 14 | |
| Kyle McMartin | 804f159 | 2006-03-23 03:00:16 -0800 | [diff] [blame] | 15 | #ifndef __read_mostly |
| Christoph Lameter | 6c03652 | 2005-07-07 17:56:59 -0700 | [diff] [blame] | 16 | #define __read_mostly |
| 17 | #endif |
| 18 | |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #ifndef ____cacheline_aligned |
| 20 | #define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES))) |
| 21 | #endif |
| 22 | |
| 23 | #ifndef ____cacheline_aligned_in_smp |
| 24 | #ifdef CONFIG_SMP |
| 25 | #define ____cacheline_aligned_in_smp ____cacheline_aligned |
| 26 | #else |
| 27 | #define ____cacheline_aligned_in_smp |
| 28 | #endif /* CONFIG_SMP */ |
| 29 | #endif |
| 30 | |
| 31 | #ifndef __cacheline_aligned |
| 32 | #define __cacheline_aligned \ |
| 33 | __attribute__((__aligned__(SMP_CACHE_BYTES), \ |
| Tim Abbott | 4af57b7 | 2010-02-20 01:03:34 +0100 | [diff] [blame] | 34 | __section__(".data..cacheline_aligned"))) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #endif /* __cacheline_aligned */ |
| 36 | |
| 37 | #ifndef __cacheline_aligned_in_smp |
| 38 | #ifdef CONFIG_SMP |
| 39 | #define __cacheline_aligned_in_smp __cacheline_aligned |
| 40 | #else |
| 41 | #define __cacheline_aligned_in_smp |
| 42 | #endif /* CONFIG_SMP */ |
| 43 | #endif |
| 44 | |
| Ravikiran G Thirumalai | 22fc6ec | 2006-01-08 01:01:27 -0800 | [diff] [blame] | 45 | /* |
| 46 | * The maximum alignment needed for some critical structures |
| 47 | * These could be inter-node cacheline sizes/L3 cacheline |
| 48 | * size etc. Define this in asm/cache.h for your arch |
| 49 | */ |
| 50 | #ifndef INTERNODE_CACHE_SHIFT |
| 51 | #define INTERNODE_CACHE_SHIFT L1_CACHE_SHIFT |
| 52 | #endif |
| 53 | |
| 54 | #if !defined(____cacheline_internodealigned_in_smp) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #if defined(CONFIG_SMP) |
| Ravikiran G Thirumalai | 22fc6ec | 2006-01-08 01:01:27 -0800 | [diff] [blame] | 56 | #define ____cacheline_internodealigned_in_smp \ |
| 57 | __attribute__((__aligned__(1 << (INTERNODE_CACHE_SHIFT)))) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #else |
| Ravikiran G Thirumalai | 22fc6ec | 2006-01-08 01:01:27 -0800 | [diff] [blame] | 59 | #define ____cacheline_internodealigned_in_smp |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #endif |
| 61 | #endif |
| 62 | |
| Pekka Enberg | 1b27d05 | 2008-04-28 02:12:22 -0700 | [diff] [blame] | 63 | #ifndef CONFIG_ARCH_HAS_CACHE_LINE_SIZE |
| 64 | #define cache_line_size() L1_CACHE_BYTES |
| 65 | #endif |
| 66 | |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #endif /* __LINUX_CACHE_H */ |