Highmem crash
Hemanth V
hemanthv at ti.com
Fri Sep 11 09:58:56 EDT 2009
Hi All,
I am seeing the below crash if I pass __GFP_HIGHMEM flag to
dma_alloc_coherent. Is this a known issue. I am currently using
2.6.31-rc7 kernel along with 2 latest highmem patches from Nicolas Pitre
tree (http://git.marvell.com/?p=orion.git;a=summary).
Thanks
Hemanth
<Unable to handle kernel NULL pointer dereference at virtual address
00000000
<1>pgd = cfab4000
<1>[00000000] *pgd=8e3f5031[00000000] *pgd=8e3f5031, *pte=00000000,
*pte=00000000, *ppte=00000000, *ppte=00000000
Internal error: Oops: 817 [#1]
<d>Modules linked in:Modules linked in: omap2_mcspi_new_datatest(+)
omap2_mcspi_new_datatest(+)
CPU: 0 Not tainted (2.6.31-rc7-omap1-06908-gf1cc27d-dirty #9)
PC is at __memzero+0x24/0x80
LR is at 0x0
pc : [<c017d8e4>] lr : [<00000000>] psr: 20000013
sp : cf9e1d4c ip : 00000000 fp : cf9e1d9c
r10: 00000000 r9 : cf9e0000 r8 : c04758a4
r7 : 00000002 r6 : 00001000 r5 : c0893380 r4 : 00000000
r3 : 00000000 r2 : 00000000 r1 : 00000fc0 r0 : 00000000
Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
Control: 10c5387d Table: 8fab4019 DAC: 00000015
Process insmod (pid: 519, stack limit = 0xcf9e02e8)
Stack: (0xcf9e1d4c to 0xcf9e2000)
[<c017d8e4>] [<c017d8e4>] (__memzero+0x24/0x80) (__memzero+0x24/0x80) from
[<c0034510>] from [<c0034510>] (dma_alloc_coherent+0x58/0x64)
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