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author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2009-12-15 08:49:32 -0800 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2009-12-15 08:49:32 -0800 |
commit | 7547a3e8a43d31aaf91c2daf5f597e43212ccddf (patch) | |
tree | add99b58ac3b490f6ede666b9dbf2333d87e24fa /mm/percpu.c | |
parent | 0f5e182dff576e6f3cd9b805834f18d11f2882aa (diff) | |
parent | 3ea6b3d0e6d0ffd91c0f8cadeb69b7133c038b32 (diff) |
Merge commit 'linus' into next
Diffstat (limited to 'mm/percpu.c')
-rw-r--r-- | mm/percpu.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/mm/percpu.c b/mm/percpu.c index 5adfc268b40..442010cc91c 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -46,8 +46,6 @@ * * To use this allocator, arch code should do the followings. * - * - drop CONFIG_HAVE_LEGACY_PER_CPU_AREA - * * - define __addr_to_pcpu_ptr() and __pcpu_ptr_to_addr() to translate * regular address to percpu pointer and back if they need to be * different from the default @@ -74,6 +72,7 @@ #include <asm/cacheflush.h> #include <asm/sections.h> #include <asm/tlbflush.h> +#include <asm/io.h> #define PCPU_SLOT_BASE_SHIFT 5 /* 1-31 shares the same slot */ #define PCPU_DFL_MAP_ALLOC 16 /* start a map with 16 ents */ @@ -1302,6 +1301,27 @@ void free_percpu(void *ptr) } EXPORT_SYMBOL_GPL(free_percpu); +/** + * per_cpu_ptr_to_phys - convert translated percpu address to physical address + * @addr: the address to be converted to physical address + * + * Given @addr which is dereferenceable address obtained via one of + * percpu access macros, this function translates it into its physical + * address. The caller is responsible for ensuring @addr stays valid + * until this function finishes. + * + * RETURNS: + * The physical address for @addr. + */ +phys_addr_t per_cpu_ptr_to_phys(void *addr) +{ + if ((unsigned long)addr < VMALLOC_START || + (unsigned long)addr >= VMALLOC_END) + return __pa(addr); + else + return page_to_phys(vmalloc_to_page(addr)); +} + static inline size_t pcpu_calc_fc_sizes(size_t static_size, size_t reserved_size, ssize_t *dyn_sizep) |