bob picco 7c21d533ab sparc64: mem boot option correction ... The "mem" boot option can result in many unexpected consequences. This patch attempts to prevent boot hangs which have been experienced on T4-4 and T5-8. Basically the boot loader allocates vmlinuz and initrd higher in available OBP physical memory. For example, on a 2Tb T5-8 it isn't possible to boot with mem=20G. The patch utilizes memblock to avoid reserved regions and trim memory which is only free. Other improvements are possible for a multi-node machine. This is a snippet of the boot log with mem=20G on T5-8 with the patch applied: MEMBLOCK configuration: <- before memory reduction memory size = 0x1ffad6ce000 reserved size = 0xa1adf44 memory.cnt = 0xb memory[0x0] [0x00000030400000-0x00003fdde47fff], 0x3fada48000 bytes memory[0x1] [0x00003fdde4e000-0x00003fdde4ffff], 0x2000 bytes memory[0x2] [0x00080000000000-0x00083fffffffff], 0x4000000000 bytes memory[0x3] [0x00100000000000-0x00103fffffffff], 0x4000000000 bytes memory[0x4] [0x00180000000000-0x00183fffffffff], 0x4000000000 bytes memory[0x5] [0x00200000000000-0x00203fffffffff], 0x4000000000 bytes memory[0x6] [0x00280000000000-0x00283fffffffff], 0x4000000000 bytes memory[0x7] [0x00300000000000-0x00303fffffffff], 0x4000000000 bytes memory[0x8] [0x00380000000000-0x00383fffc71fff], 0x3fffc72000 bytes memory[0x9] [0x00383fffc92000-0x00383fffca1fff], 0x10000 bytes memory[0xa] [0x00383fffcb4000-0x00383fffcb5fff], 0x2000 bytes reserved.cnt = 0x2 reserved[0x0] [0x00380000000000-0x0038000117e7f8], 0x117e7f9 bytes reserved[0x1] [0x00380004000000-0x0038000d02f74a], 0x902f74b bytes ... MEMBLOCK configuration: <- after reduction of memory memory size = 0x50a1adf44 reserved size = 0xa1adf44 memory.cnt = 0x4 memory[0x0] [0x00380000000000-0x0038000117e7f8], 0x117e7f9 bytes memory[0x1] [0x00380004000000-0x0038050d01d74a], 0x50901d74b bytes memory[0x2] [0x00383fffc92000-0x00383fffca1fff], 0x10000 bytes memory[0x3] [0x00383fffcb4000-0x00383fffcb5fff], 0x2000 bytes reserved.cnt = 0x2 reserved[0x0] [0x00380000000000-0x0038000117e7f8], 0x117e7f9 bytes reserved[0x1] [0x00380004000000-0x0038000d02f74a], 0x902f74b bytes ... Early memory node ranges node 7: [mem 0x380000000000-0x38000117dfff] node 7: [mem 0x380004000000-0x380f0d01bfff] node 7: [mem 0x383fffc92000-0x383fffca1fff] node 7: [mem 0x383fffcb4000-0x383fffcb5fff] Could not find start_pfn for node 0 Could not find start_pfn for node 1 Could not find start_pfn for node 2 Could not find start_pfn for node 3 Could not find start_pfn for node 4 Could not find start_pfn for node 5 Could not find start_pfn for node 6 . The patch was tested on T4-1, T5-8 and Jalap?no. Cc: sparclinux@vger.kernel.org Signed-off-by: Bob Picco <bob.picco@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2014-09-16 18:23:11 -07:00
..
extable.c
fault_32.c	sparc32: fix sparse warnings in unaligned_32.c	2014-04-29 01:12:26 -04:00
fault_64.c	sparc64: sun4v TLB error power off events	2014-09-16 17:46:44 -07:00
gup.c	sparc64: Fix bugs in get_user_pages_fast() wrt. THP.	2014-05-03 22:32:37 -07:00
highmem.c
hugetlbpage.c	hugetlb: restrict hugepage_migration_support() to x86_64	2014-06-04 16:53:51 -07:00
hypersparc.S
init_32.c	sparc32: fix sparse warning in devices.c	2014-04-29 01:12:26 -04:00
init_64.c	sparc64: mem boot option correction	2014-09-16 18:23:11 -07:00
init_64.h	sparc: drop use of extern for prototypes in arch/sparc/*	2014-05-18 19:01:29 -07:00
io-unit.c	sparc32: fix sparse warning in io-unit.c	2014-05-18 19:01:26 -07:00
iommu.c	sparc32: fix sparse warning in iommu.c	2014-05-18 19:01:26 -07:00
leon_mm.c	sparc32: fix sparse "Should it be static?" in mm/	2014-04-29 01:12:25 -04:00
Makefile
mm_32.h	sparc32: fix sparse "Should it be static?" in mm/	2014-04-29 01:12:25 -04:00
srmmu_access.S
srmmu.c	sparc32: fix sparse "Should it be static?" in mm/	2014-04-29 01:12:25 -04:00
swift.S
tlb.c	sparc64: Fix huge PMD invalidation.	2014-05-03 22:31:52 -07:00
tsb.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next	2014-06-19 07:50:07 -10:00
tsunami.S
ultra.S
viking.S