[meta-intel] [PATCH v2 4/5] fri2.conf: fix boot time kernel errors

[Darren Hart]

On 01/31/2013 10:31 AM, nitin.a.kamble at intel.com wrote:
> From: Nitin A Kamble <nitin.a.kamble at intel.com>
> 
> The fri2 kernel is hitting kernel BUGs while booting as seen bellow.
> 
> BUG: Bad page state in process loop0  pfn:3803
> page:f6991700 count:0 mapcount:0 mapping:  (null) index:0x0
> page flags: 0x80400000(uncached)
> Modules linked in: emgd drm_kms_helper ip_tables x_tables arc4 minix cdc_acm iwlwifi led_class mac80211 cfg80211 firmware_class
> Pid: 448, comm: loop0 Not tainted 3.4.26-yocto-standard #1
> Call Trace:
>  [<c10cdb0f>] bad_page+0x8f/0xe0
>  [<c10ce0e5>] get_page_from_freelist+0x435/0x4e0
>  [<c10ce2c5>] __alloc_pages_nodemask+0x135/0x690
>  [<c10d1964>] __do_page_cache_readahead+0xe4/0x210
>  [<c1055a6b>] ? get_parent_ip+0xb/0x40
>  [<c1055a6b>] ? get_parent_ip+0xb/0x40
>  [<c10d1cf7>] ra_submit+0x27/0x30
>  [<c10d1e37>] ondemand_readahead+0x137/0x230
>  [<c166b061>] ? __wait_on_bit_lock+0x61/0xa0
>  [<c10d1fae>] page_cache_async_readahead+0x7e/0xa0
>  [<c112b590>] __generic_file_splice_read+0x360/0x5a0
>  [<c1129e90>] ? page_cache_pipe_buf_release+0x20/0x20
>  [<c105c56c>] ? enqueue_task_fair+0x1ac/0x620
>  [<c105b584>] ? check_preempt_wakeup+0x144/0x220
>  [<c1054b32>] ? check_preempt_curr+0x72/0x90
>  [<c1051f5d>] ? ttwu_stat+0x2d/0x100
>  [<c1055a6b>] ? get_parent_ip+0xb/0x40
>  [<c1055a6b>] ? get_parent_ip+0xb/0x40
>  [<c1670763>] ? sub_preempt_count+0x43/0xb0
>  [<c102573e>] ? __kunmap_atomic+0x3e/0x90
>  [<c13b22c0>] ? loop_make_request+0xf0/0xf0
>  [<c13b19b9>] ? lo_splice_actor+0x89/0xc0
>  [<c12c01e4>] ? security_file_permission+0x94/0xb0
>  [<c112b83c>] generic_file_splice_read+0x6c/0xe0
>  [<c112b7d0>] ? __generic_file_splice_read+0x5a0/0x5a0
>  [<c112a201>] vfs_splice_to+0x61/0x80
>  [<c112a2ca>] splice_direct_to_actor+0xaa/0x1d0
>  [<c13b21b0>] ? loop_thread+0x510/0x510
>  [<c13b1f43>] loop_thread+0x2a3/0x510
>  [<c13b1ca0>] ? do_lo_send_write+0xe0/0xe0
>  [<c1047103>] kthread+0x73/0x80
>  [<c1047090>] ? kthread_freezable_should_stop+0x50/0x50
>  [<c1673df6>] kernel_thread_helper+0x6/0x10
> 
> FRI2 has 1GB of ram, hence the kernel sets 128MB for the vmalloc
> allocation memory. And the emgd driver needs at least 256MB vmalloc
> memory to work correctly. This commit specifies the vmalloc allocation
> size to the kernel by the vmalloc=256MB boot parameter.
> 
> Adjusting the kernel's vmalloc allocation size fixes the kernel errors.
> 
> This fixes bug:
> [Yocto #3810]
> 
> Signed-off-by: Nitin A Kamble <nitin.a.kamble at intel.com>

Acked-by: Darren Hart <dvhart at linux.intel.com>

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel