Russell, I have attached the dump below, Summary, we have latest kernel 2.6.31-rc5-omap1 running on beagle with ARCH_HAS_HOLES_MEMORYMODEL enabled for OMAP architecture. 80000000 to 857FFFFF - (88M for kernel) 85800000 to 8c3FFFFF - (108M hole) 8c400000 to 8FFFFFFF - (60M for kernel) After booting the kernel and a kernel module uses request_mem_region and ioremap to create some pool of memory in the hole region. A user application mmap s this space and uses memset to fill 0s in one of the pool. This results in a crash. When we don't create the hole (kernel has only 88M) and run same kernel module and app then it passes. I am doing some clean up to my test driver and app, I can pass these later this week. Thanks Regards, Khasim > -----Original Message----- > From: Russell King - ARM Linux [mailto:linux@xxxxxxxxxxxxxxxx] > Sent: Saturday, August 08, 2009 10:33 PM > To: Syed Mohammed, Khasim > Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxxxxx; linux-omap@xxxxxxxxxxxxxxx > Subject: Re: Exception while handling MEM Hole on OMAP3 / ARM Cortex A8 > > On Sat, Aug 08, 2009 at 08:45:44PM +0530, Syed Mohammed, Khasim wrote: > > Hi Russell, > > > > > -----Original Message----- > > > From: Russell King - ARM Linux [mailto:linux@xxxxxxxxxxxxxxxx] > > > Sent: Saturday, August 08, 2009 3:30 AM > > > To: Syed Mohammed, Khasim > > > Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxxxxx; linux-omap@xxxxxxxxxxxxxxx > > > Subject: Re: Exception while handling MEM Hole on OMAP3 / ARM Cortex A8 > > > > > > On Sat, Aug 08, 2009 at 01:46:35AM +0530, Syed Mohammed, Khasim wrote: > > > > On OMAP3 we are creating a space for DSP components to have shared > > > > buffers using the boot arguments. > > > > > > > > mem=88M@0x80000000 mem=128M@0x88000000 > > > > > > Ensure that you have ARCH_HAS_HOLES_MEMORYMODEL enabled in the > > > configuration - you need OMAP3 to select this symbol. > > > > We are on 2.6.29 on beagleboard, this kernel doesn't support ARCH_HAS_HOLES_MEMORYMODEL so I > applied the patch from > > > > http://git.kernel.org/?p=linux/kernel/git/tmlind/linux-omap- > 2.6.git;a=commitdiff;h=eb33575cf67d3f35fa2510210ef92631266e2465 > > > > Didn't help, still fails, do you suggest us to move to latest kernel and try the same instead of > patch alone? > > In which case, please supply a full bug report with a _full_ oops dump. root@beagleboard:/media/mmcblk0p1# ./a.out mmap: vma->vm_start = 0x40137000 mmap: vma->vm_pgoff = 0x85ce1 mmap: vma->vm_end = 0x404a6000 mmap: size = 0x36f000 <1>Unable to handle kernel paging request at virtual address c5cef000 Unable to handle kernel paging request at virtual address c5cef000 Internal error: Oops: 805 [#4] Internal error: Oops: 805 [#4] <d>Modules linked in:Modules linked in: cmemk cmemk CPU: 0 Tainted: G D (2.6.31-rc5-omap1 #7) CPU: 0 Tainted: G D (2.6.31-rc5-omap1 #7) PC is at v7_flush_kern_dcache_page+0x14/0x2c PC is at v7_flush_kern_dcache_page+0x14/0x2c LR is at __flush_dcache_page+0x28/0x34 LR is at __flush_dcache_page+0x28/0x34 pc : [<c002c348>] lr : [<c002a950>] psr: 00000113 sp : ce97be80 ip : c0415de0 fp : 0000081f pc : [<c002c348>] lr : [<c002a950>] psr: 00000113 sp : ce97be80 ip : c0415de0 fp : 0000081f r10: 00000514 r9 : 00001000 r8 : 40145000 r10: 00000514 r9 : 00001000 r8 : 40145000 r7 : c1daec80 r6 : 85cef383 r5 : cf8b39a0 r4 : c1daec80 r7 : c1daec80 r6 : 85cef383 r5 : cf8b39a0 r4 : c1daec80 r3 : 00000002 r2 : 00000040 r1 : c5cf0000 r0 : c5cef000 r3 : 00000002 r2 : 00000040 r1 : c5cf0000 r0 : c5cef000 Flags: nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Flags: nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 10c5387d Table: 8f850019 DAC: 00000015 Control: 10c5387d Table: 8f850019 DAC: 00000015 Process a.out (pid: 893, stack limit = 0xce97a2e8) Process a.out (pid: 893, stack limit = 0xce97a2e8) Stack: (0xce97be80 to 0xce97c000) Stack: (0xce97be80 to 0xce97c000) be80: be80: c1daec80 c1daec80 c002a88c c002a88c 00000000 00000000 c007eaa4 c007e aa4 c0320890 c0320890 c03203f0 c03203f0 b954fd20 b954fd20 000002cc 000002cc bea0: bea0: 00000001 00000001 ce8ed7e0 ce8ed7e0 07735940 07735940 cf851000 cf851 000 ce97bee0 ce97bee0 c0317d20 c0317d20 cf8b39a0 cf8b39a0 c1daec80 c1daec80 bec0: bec0: ce8ed814 ce8ed814 ce8ed7e0 ce8ed7e0 ce97bfb0 ce97bfb0 40145000 40145 000 0000081f 0000081f c002a1b0 c002a1b0 07735940 07735940 00000bd3 00000bd3 bee0: bee0: 07735940 07735940 00000800 00000800 06feeec9 06feeec9 c0317d20 c0317 d20 c0317e10 c0317e10 0000081f 0000081f ce97bfb0 ce97bfb0 40145000 40145000 bf00: bf00: 00000000 00000000 40023000 40023000 be859ce4 be859ce4 c00231ec c0023 1ec 00000bd3 00000bd3 c03223f8 c03223f8 00000001 00000001 06feeec8 06feeec8 bf20: bf20: 00000060 00000060 c035060c c035060c 00000001 00000001 c018f458 c018f 458 c035060c c035060c 00000008 00000008 c03506b0 c03506b0 c035060c c035060c bf40: bf40: 00000001 00000001 00000000 00000000 00000000 00000000 0000004a 00000 04a c1d85340 c1d85340 c018f4d0 c018f4d0 ce9e8420 ce9e8420 0000004a 0000004a bf60: bf60: 00000000 00000000 00000000 00000000 00000000 00000000 ce97a000 ce97a 000 40023000 40023000 c00692b0 c00692b0 c03241d8 c03241d8 0000004a 0000004a bf80: bf80: 00000000 00000000 00000000 00000000 00000000 00000000 c006aeb8 c006a eb8 be859ce4 be859ce4 c0049b40 c0049b40 ffffffff ffffffff 00000000 00000000 bfa0: bfa0: 00000000 00000000 00000000 00000000 00000000 00000000 c0023c7c c0023 c7c 40137000 40137000 00000000 00000000 002f1ff4 002f1ff4 40145000 40145000 bfc0: bfc0: 40022e08 40022e08 00000000 00000000 00000000 00000000 00000000 00000 000 00000000 00000000 00000000 00000000 40023000 40023000 be859ce4 be859ce4 bfe0: bfe0: 4008cac0 4008cac0 be859ce0 be859ce0 000099dc 000099dc 4008caec 4008c aec 20000010 20000010 ffffffff ffffffff 00000000 00000000 00000000 00000000 [<c002c348>] [<c002c348>] (v7_flush_kern_dcache_page+0x14/0x2c) (v7_flush_kern_d cache_page+0x14/0x2c) from [<c1daec80>] from [<c1daec80>] (0xc1daec80) (0xc1daec80) Code: Code: e2033007 e2033007 e3a02010 e3a02010 e1a02312 e1a02312 e2801a01 e2801 a01 (ee070f3e) (ee070f3e) 00 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
