Messages in this thread | | | Date | Sun, 21 Apr 2002 09:47:52 +1000 | From | Anton Blanchard <> | Subject | Re: vmalloc comments patch |
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Hi,
> + * To give a safety margin, the linear address starts about 8MB after the end > + * of physical memory at VMALLOC_START. This is to try and catch memory > + * overruns.
Thats architecture dependent. On ppc64 for example the kernel text starts at 0xC000000000000000 and the vmalloc region starts at 0xD000000000000000, 2^60 bits apart.
> + /* The page table is unlocked because we don't need to traverse > + * the page tables while a page is been allocated. As > + * alloc_page could block for a long time, let go the lock > + */ > spin_unlock(&init_mm.page_table_lock); > page = alloc_page(gfp_mask); > spin_lock(&init_mm.page_table_lock);
Since alloc_page can sleep we must drop the spinlock.
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