Thus spake Benjamin Herrenschmidt (b...@kernel.crashing.org): > Bernhard, Rex, please let me know if that works for you.
it doesn't work for me, it crashes differently then before though! This patch worked for me: > > Signed-off-by: Bernhard Weirich <bernhard.weir...@riedel.net> > --- linux/arch/powerpc/include/asm/pte-common.h 2009-09-16 11:23:44.000000000 > +0200 > +++ linux/arch/powerpc/include/asm/pte-common.h 2009-09-22 11:13:08.000000000 > +0200 > @@ -176,7 +176,7 @@ > #define HAVE_PAGE_AGP > > /* Advertise support for _PAGE_SPECIAL */ > -#ifdef _PAGE_SPECIAL > +#if _PAGE_SPECIAL != 0 > #define __HAVE_ARCH_PTE_SPECIAL > #endif > without either patch: boots into userspace, starts running my code which uses mmap to access an fpga: BUG: Bad page map in process loadfpga pte:ff1008d3 pmd:02103001 addr:30028000 vm_flags:400844fb anon_vma:(null) mapping:c30000e8 index:ff100 vma->vm_ops->fault: 0x0 vma->vm_file->f_op->mmap: mmap_mem+0x0/0xa8 Call Trace: [c2107db0] [c00067d0] show_stack+0x44/0x14c (unreliable) [c2107df0] [c0056854] print_bad_pte+0x1b4/0x1d0 [c2107e20] [c0056898] vm_normal_page+0x28/0x50 [c2107e30] [c0056c30] unmap_vmas+0x1b8/0x510 [c2107eb0] [c005b17c] unmap_region+0x94/0x124 [c2107ef0] [c005c110] do_munmap+0x264/0x2dc [c2107f20] [c005c1c0] sys_munmap+0x38/0x5c [c2107f40] [c000d0dc] ret_from_syscall+0x0/0x38 trunk+benh complicated patch: crashes earlier: BUG: Bad page map in process swapper pte:001f88e9 pmd:020d8001 addr:7ffffff6 vm_flags:00100177 anon_vma:c20d95e0 mapping:(null) index:7ffff Call Trace: [c341fd20] [c00067d0] show_stack+0x44/0x14c (unreliable) [c341fd60] [c0056860] print_bad_pte+0x1b4/0x1d0 [c341fd90] [c00568c8] vm_normal_page+0x4c/0x78 [c341fda0] [c0056988] follow_page+0x94/0x1b8 [c341fdc0] [c005854c] __get_user_pages+0x324/0x3c4 [c341fe20] [c006c12c] get_arg_page+0x40/0xac [c341fe40] [c006c374] copy_strings+0xec/0x1d4 [c341fe80] [c006c47c] copy_strings_kernel+0x20/0x38 [c341fea0] [c006d3cc] do_execve+0x110/0x240 [c341fee0] [c00070c4] sys_execve+0x50/0x7c [c341ff00] [c000d0dc] ret_from_syscall+0x0/0x38 [c341ffc0] [c00023ac] init_post+0x5c/0x168 [c341ffe0] [c01df22c] kernel_init+0x10c/0x124 [c341fff0] [c000cf3c] kernel_thread+0x4c/0x68 this is running on a MPC 875, and I'm happy to test any patches or add any debugging code if it helps. thanks! /rex _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
