Brian King 48f797de55 powerpc: Check for valid hugepage size in hugetlb_get_unmapped_area ... It looks like most of the hugetlb code is doing the correct thing if hugepages are not supported, but the mmap code is not. If we get into the mmap code when hugepages are not supported, such as in an LPAR which is running Active Memory Sharing, we can oops the kernel. This fixes the oops being seen in this path. oops: Kernel access of bad area, sig: 11 [#1] SMP NR_CPUS=1024 NUMA pSeries Modules linked in: nfs(N) lockd(N) nfs_acl(N) sunrpc(N) ipv6(N) fuse(N) loop(N) dm_mod(N) sg(N) ibmveth(N) sd_mod(N) crc_t10dif(N) ibmvscsic(N) scsi_transport_srp(N) scsi_tgt(N) scsi_mod(N) Supported: No NIP: c000000000038d60 LR: c00000000003945c CTR: c0000000000393f0 REGS: c000000077e7b830 TRAP: 0300 Tainted: G (2.6.27.5-bz50170-2-ppc64) MSR: 8000000000009032 <EE,ME,IR,DR> CR: 44000448 XER: 20000001 DAR: c000002000af90a8, DSISR: 0000000040000000 TASK = c00000007c1b8600[4019] 'hugemmap01' THREAD: c000000077e78000 CPU: 6 GPR00: 0000001fffffffe0 c000000077e7bab0 c0000000009a4e78 0000000000000000 GPR04: 0000000000010000 0000000000000001 00000000ffffffff 0000000000000001 GPR08: 0000000000000000 c000000000af90c8 0000000000000001 0000000000000000 GPR12: 000000000000003f c000000000a73880 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000010000 GPR20: 0000000000000000 0000000000000003 0000000000010000 0000000000000001 GPR24: 0000000000000003 0000000000000000 0000000000000001 ffffffffffffffb5 GPR28: c000000077ca2e80 0000000000000000 c00000000092af78 0000000000010000 NIP [c000000000038d60] .slice_get_unmapped_area+0x6c/0x4e0 LR [c00000000003945c] .hugetlb_get_unmapped_area+0x6c/0x80 Call Trace: [c000000077e7bbc0] [c00000000003945c] .hugetlb_get_unmapped_area+0x6c/0x80 [c000000077e7bc30] [c000000000107e30] .get_unmapped_area+0x64/0xd8 [c000000077e7bcb0] [c00000000010b140] .do_mmap_pgoff+0x140/0x420 [c000000077e7bd80] [c00000000000bf5c] .sys_mmap+0xc4/0x140 [c000000077e7be30] [c0000000000086b4] syscall_exit+0x0/0x40 Instruction dump: fac1ffb0 fae1ffb8 fb01ffc0 fb21ffc8 fb41ffd0 fb61ffd8 fb81ffe0 fbc1fff0 fbe1fff8 f821fef1 f8c10158 f8e10160 <7d49002e> f9010168 e92d01b0 eb4902b0 Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>		2008-12-16 13:48:18 +11:00
..
40x_mmu.c	powerpc/40x: Limit allocable DRAM during early mapping	2008-11-13 10:10:56 -05:00
44x_mmu.c	powerpc: rework 4xx PTE access and TLB miss	2008-07-09 13:36:17 -04:00
Makefile	powerpc/mm: Lockless get_user_pages_fast() for 64-bit (v3)	2008-07-30 15:26:54 +10:00
fault.c	powerpc: BookE hardware watchpoint support	2008-07-25 15:44:39 +10:00
fsl_booke_mmu.c	powerpc/85xx: fix build warning, remove silly cast	2008-09-16 10:01:35 -05:00
gup.c	powerpc: Get USE_STRICT_MM_TYPECHECKS working again	2008-10-14 10:35:27 +11:00
hash_low_32.S	POWERPC: Allow 32-bit hashed pgtable code to support 36-bit physical	2008-09-24 16:29:44 -05:00
hash_low_64.S	powerpc: Free a PTE bit on ppc64 with 64K pages	2008-06-30 22:30:53 +10:00
hash_native_64.c	[POWERPC] Use 1TB segments	2007-10-12 14:05:17 +10:00
hash_utils_64.c	powerpc: Don't use a 16G page if beyond mem= limits	2008-10-22 15:01:21 +11:00
hugetlbpage.c	powerpc: Check for valid hugepage size in hugetlb_get_unmapped_area	2008-12-16 13:48:18 +11:00
init_32.c	powerpc: Fix problems with 32bit PPC's running with >= 4GB of RAM	2008-07-09 14:13:01 -04:00
init_64.c	powerpc: Get USE_STRICT_MM_TYPECHECKS working again	2008-10-14 10:35:27 +11:00
mem.c	mm: cleanup to make remove_memory() arch-neutral	2008-10-20 08:50:25 -07:00
mmap.c	Detach sched.h from mm.h	2007-05-21 09:18:19 -07:00
mmu_context_32.c	[POWERPC] Remove the dregs of APUS support from arch/powerpc	2007-06-14 22:30:15 +10:00
mmu_context_64.c	[POWERPC] Tidy up CONFIG_PPC_MM_SLICES code	2007-08-17 11:01:59 +10:00
mmu_decl.h	powerpc: Fix problems with 32bit PPC's running with >= 4GB of RAM	2008-07-09 14:13:01 -04:00
numa.c	powerpc: Fix boot freeze on machine with empty memory node	2008-12-01 09:40:18 +11:00
pgtable_32.c	POWERPC: Allow 32-bit hashed pgtable code to support 36-bit physical	2008-09-24 16:29:44 -05:00
pgtable_64.c	powerpc ioremap_prot	2008-07-24 10:47:15 -07:00
ppc_mmu_32.c	powerpc: Force printing of 'total_memory' to unsigned long long	2008-08-04 13:18:17 +10:00
slb.c	[POWERPC] vmemmap fixes to use smaller pages	2008-05-15 20:49:25 +10:00
slb_low.S	[POWERPC] vmemmap fixes to use smaller pages	2008-05-15 20:49:25 +10:00
slice.c	Merge commit 'origin/master'	2008-07-16 11:07:59 +10:00
stab.c	[POWERPC] Fix sparse warnings in arch/powerpc/mm	2008-05-14 22:31:46 +10:00
subpage-prot.c	[POWERPC] Provide a way to protect 4k subpages when using 64k pages	2008-01-24 10:06:01 +11:00
tlb_32.c	POWERPC: Allow 32-bit hashed pgtable code to support 36-bit physical	2008-09-24 16:29:44 -05:00
tlb_64.c	powerpc: Move include files to arch/powerpc/include/asm	2008-08-04 12:02:00 +10:00