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author | Haicheng Li <haicheng.li@linux.intel.com> | 2010-05-19 09:42:14 (GMT) |
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committer | H. Peter Anvin <hpa@linux.intel.com> | 2010-08-26 21:02:29 (GMT) |
commit | 6afb5157b9eba4092e2f0f54d24a3806409bdde5 (patch) | |
tree | 5d213ef0366441af288b3a293557df09cb45cdca /arch/x86/mm/init_64.c | |
parent | 61c77326d1df079f202fa79403c3ccd8c5966a81 (diff) | |
download | linux-fsl-qoriq-6afb5157b9eba4092e2f0f54d24a3806409bdde5.tar.xz |
x86, mm: Separate x86_64 vmalloc_sync_all() into separate functions
No behavior change.
Move some of vmalloc_sync_all() code into a new function
sync_global_pgds() that will be useful for memory hotplug.
Signed-off-by: Haicheng Li <haicheng.li@linux.intel.com>
LKML-Reference: <4C6E4ECD.1090607@linux.intel.com>
Reviewed-by: Wu Fengguang <fengguang.wu@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/mm/init_64.c')
-rw-r--r-- | arch/x86/mm/init_64.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 9a66746..61a1b4f 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -98,6 +98,36 @@ static int __init nonx32_setup(char *str) __setup("noexec32=", nonx32_setup); /* + * When memory was added/removed make sure all the processes MM have + * suitable PGD entries in the local PGD level page. + */ +void sync_global_pgds(unsigned long start, unsigned long end) +{ + unsigned long address; + + for (address = start; address <= end; address += PGDIR_SIZE) { + const pgd_t *pgd_ref = pgd_offset_k(address); + unsigned long flags; + struct page *page; + + if (pgd_none(*pgd_ref)) + continue; + + spin_lock_irqsave(&pgd_lock, flags); + list_for_each_entry(page, &pgd_list, lru) { + pgd_t *pgd; + pgd = (pgd_t *)page_address(page) + pgd_index(address); + if (pgd_none(*pgd)) + set_pgd(pgd, *pgd_ref); + else + BUG_ON(pgd_page_vaddr(*pgd) + != pgd_page_vaddr(*pgd_ref)); + } + spin_unlock_irqrestore(&pgd_lock, flags); + } +} + +/* * NOTE: This function is marked __ref because it calls __init function * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. */ |