[Linux-Xtensa] kmalloc failure in kernel

[linux-xtensa at linux-xtensa.org]

Hi,

   I was working on bringing up the virtual frame buffer and it was fine. I wanted to modify that and wanted to map a DMA capable physical memory instead of using virtual memory.

  So I modified the vmalloc_32(size) call to kmalloc(size, (GFP_DMA|GFP_KERNEL) but the kernel crashes at this point.

  For testing I tried kmalloc( 32, GPF_KERNEL ), but the same result.

The dump is given below

Unable to handle kernel paging request at virtual address 00000000
 pc = d015682b, ra = 900c3345
Oops: sig: 11 [#1]

a00: 900c3345 d3817dc0 d2e48c00 d002dce4 00000400 d38514c0 00100000 d38514c0
a08: 90156828 00060900 00000000 d0510d38 d0510000 00000000 00000003 00010000
pc: d015682b, ps: 00060913, depc: 00000018, excvaddr: 00000000
lbeg: d00e8408, lend: d00e8413 lcount: 00000000, sar: 0000001e

Stack: 900c23ee d3817e00 00000000 d013f9ac d2e48c00 00000000 00000000 00000001
       d2e9cb90 d38514c0 00100000 00100fff 900c2489 d3817e20 00000001 d2e48c08
       00000001 d0064fa8 d2e48cb0 d2e48c08 900c1d18 d3817e40 d013f9ac d2e48c08
Call Trace:
 [<d00c241a>] driver_probe_device+0x92/0xf4
 [<d00c2489>] __device_attach+0xd/0x14
 [<d00c1d18>] bus_for_each_drv+0x2c/0x50
 [<d00c251c>] device_attach+0x5c/0x7c
 [<d00c1cb4>] bus_attach_device+0x24/0x5c
 [<d00c1229>] device_add+0x1b9/0x314
 [<d00c3622>] platform_device_add+0xc2/0xe8
 [<d0156af9>] cochinfb_init+0x135/0x158
 [<d014fe65>] kernel_init+0xb9/0x1cc
 [<d00022c9>] kernel_thread+0x1d/0x28

Kernel panic - not syncing: Attempted to kill init!





Thanks
Sanu