blk_max_low_pfn 20 block/blk-settings.c unsigned long blk_max_low_pfn; blk_max_low_pfn 21 block/blk-settings.c EXPORT_SYMBOL(blk_max_low_pfn); blk_max_low_pfn 152 block/blk-settings.c if (b_pfn < blk_max_low_pfn) blk_max_low_pfn 879 block/blk-settings.c blk_max_low_pfn = max_low_pfn - 1; blk_max_low_pfn 780 include/linux/blkdev.h extern unsigned long blk_max_low_pfn, blk_max_pfn; blk_max_low_pfn 791 include/linux/blkdev.h #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)