Mark Nelson e423b9ecd6 powerpc: Fix 64bit memcpy() regression ... This fixes a regression introduced by commit 25d6e2d7c5 ("powerpc: Update 64bit memcpy() using CPU_FTR_UNALIGNED_LD_STD"). This commit allowed CPUs that have the CPU_FTR_UNALIGNED_LD_STD CPU feature bit present to do the memcpy() with unaligned load doubles. But, along with this came a bug where our final load double would read bytes beyond a page boundary and into the next (unmapped) page. This was caught by enabling CONFIG_DEBUG_PAGEALLOC, The fix was to read only the number of bytes that we need to store rather than reading a full 8-byte doubleword and storing only a portion of that. In order to minimise the amount of existing code touched we use the original do_tail for the src_unaligned case. Below is an example of the regression, as reported by Sachin Sant: Unable to handle kernel paging request for data at address 0xc00000003f380000 Faulting instruction address: 0xc000000000039574 cpu 0x1: Vector: 300 (Data Access) at [c00000003baf3020] pc: c000000000039574: .memcpy+0x74/0x244 lr: d00000000244916c: .ext3_xattr_get+0x288/0x2f4 [ext3] sp: c00000003baf32a0 msr: 8000000000009032 dar: c00000003f380000 dsisr: 40000000 current = 0xc00000003e54b010 paca = 0xc000000000a53680 pid = 1840, comm = readahead enter ? for help [link register ] d00000000244916c .ext3_xattr_get+0x288/0x2f4 [ext3] [c00000003baf32a0] d000000002449104 .ext3_xattr_get+0x220/0x2f4 [ext3] (unreliab le) [c00000003baf3390] d00000000244a6e8 .ext3_xattr_security_get+0x40/0x5c [ext3] [c00000003baf3400] c000000000148154 .generic_getxattr+0x74/0x9c [c00000003baf34a0] c000000000333400 .inode_doinit_with_dentry+0x1c4/0x678 [c00000003baf3560] c00000000032c6b0 .security_d_instantiate+0x50/0x68 [c00000003baf35e0] c00000000013c818 .d_instantiate+0x78/0x9c [c00000003baf3680] c00000000013ced0 .d_splice_alias+0xf0/0x120 [c00000003baf3720] d00000000243e05c .ext3_lookup+0xec/0x134 [ext3] [c00000003baf37c0] c000000000131e74 .do_lookup+0x110/0x260 [c00000003baf3880] c000000000134ed0 .__link_path_walk+0xa98/0x1010 [c00000003baf3970] c0000000001354a0 .path_walk+0x58/0xc4 [c00000003baf3a20] c000000000135720 .do_path_lookup+0x138/0x1e4 [c00000003baf3ad0] c00000000013645c .path_lookup_open+0x6c/0xc8 [c00000003baf3b70] c000000000136780 .do_filp_open+0xcc/0x874 [c00000003baf3d10] c0000000001251e0 .do_sys_open+0x80/0x140 [c00000003baf3dc0] c00000000016aaec .compat_sys_open+0x24/0x38 [c00000003baf3e30] c00000000000855c syscall_exit+0x0/0x40 Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>		2009-02-26 14:02:53 +11:00
..
boot	powerpc/83xx: Fix TSEC0 workability on MPC8313E-RDB boards	2009-02-06 10:38:57 -06:00
configs	powerpc/83xx: Fix TSEC0 workability on MPC8313E-RDB boards	2009-02-06 10:38:57 -06:00
include/asm	powerpc/mm: Fix _PAGE_CHG_MASK to protect _PAGE_SPECIAL	2009-02-13 16:37:44 +11:00
kernel	powerpc: Fix load/store float double alignment handler	2009-02-26 14:02:53 +11:00
kvm	KVM: Add kvm_arch_sync_events to sync with asynchronize events	2009-02-15 02:47:36 +02:00
lib	powerpc: Fix 64bit memcpy() regression	2009-02-26 14:02:53 +11:00
math-emu	powerpc: Add SPE/EFP math emulation for E500v1/v2 processors.	2008-12-03 08:19:16 -06:00
mm	powerpc/mm: Fix numa reserve bootmem page selection	2009-02-13 16:37:45 +11:00
oprofile	powerpc/cell: Add missing #include for oprofile	2009-02-10 14:39:08 +11:00
platforms	powerpc/ps3: Move ps3_mm_add_memory to device_initcall	2009-02-13 16:37:45 +11:00
sysdev	powerpc/cpm2: Fix set interrupt type	2009-02-06 10:44:02 -06:00
xmon	powerpc: Prepare xmon_save_regs for use with kdump	2008-12-23 15:13:28 +11:00
Kconfig	powerpc: Remove arch/ppc cruft from Kconfig	2009-01-28 17:15:51 +11:00
Kconfig.debug	powerpc: Allow the max stack trace depth to be configured	2008-12-03 20:46:35 +11:00
Makefile	powerpc: Remove unncessary SPE related compiler flag	2008-12-03 08:19:10 -06:00