more information:  not just related to debug -- on card insert see this

  311.430644] mmcblk1: mmc1:8fe4 SD16G 14.8 GiB (ro)                            
                                                                                
                                             
[  311.453761]  mmcblk1: p1                                                     
                                                                                
                                              
[  311.491052] FAT: IO charset iso8859-1 not found                              
                                                                                
                                              
[  311.506584] ------------[ cut here ]------------                             
                                                                                
                                              
[  311.506602] WARNING: at kernel/sched.c:4000 schedule+0x25c/0x3ac()           
                                                                                
                                              
[  311.520321] Modules linked in:                                               
                                                                                
                                              
[  311.547754] [<c002abe8>] (unwind_backtrace+0x0/0x124) from [<c003834c>] 
(warn_slowpath_common+0x4c/0x64)                                                
                                                   
[  311.547754] [<c003834c>] (warn_slowpath_common+0x4c/0x64) from [<c0038380>] 
(warn_slowpath_null+0x1c/0x24)                                                  
                                               
[  311.575939] [<c0038380>] (warn_slowpath_null+0x1c/0x24) from [<c028911c>] 
(schedule+0x25c/0x3ac)                                                          
                                                 
[  311.630782] [<c028911c>] (schedule+0x25c/0x3ac) from [<c02892ac>] 
(preempt_schedule+0x40/0x70)                                                    
                                                         
[  311.656404] [<c02892ac>] (preempt_schedule+0x40/0x70) from [<c01ec164>] 
(mmc_blk_issue_rq+0x5f4/0x8f0)                                                  
                                                   
[  311.656404] [<c01ec164>] (mmc_blk_issue_rq+0x5f4/0x8f0) from [<c01ecb5c>] 
(mmc_queue_thread+0xd4/0xf8)                                                    
                                                 
[  311.684078] [<c01ecb5c>] (mmc_queue_thread+0xd4/0xf8) from [<c00500d0>] 
(kthread+0x7c/0x84)                                                             
                                                   
[  311.736602] [<c00500d0>] (kthread+0x7c/0x84) from [<c00263e0>] 
(kernel_thread_exit+0x0/0x8)                                                    
                                                            
[  311.736602] ---[ end trace 9d0d1c3c07fa6efd ]---                             
                                                                                
                                              
[  311.775214] EXT3-fs (mmcblk1p1): error: can't find ext3 filesystem on dev 
mmcblk1p1.                                                                      
                                                 
[  311.799387] EXT2-fs (mmcblk1p1): error: can't find an ext2 filesystem on dev 
mmcblk1p1.                                                                      
                                              
[  311.822737] MTD: Attempt to mount non-MTD device "/dev/mmcblk1p1"            
                                                                                
                                              
[  311.845630] cramfs: wrong magic                                              
                                                                                
                                              


On Dec 21, 2010, at 8:40 AM, Philip Rakity wrote:

> 
> Using linux-next and enabled MMC_DEBUG
> 
> on card insert get schedule warn message sched.c line 4000
> warn on once test_tsk_need_resched(next));
> 
> This warning comes when sdhci.c printk no vmmc regulator found on card insert 
> in add_host.
> 
> Phlip--
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