On Thu, 17 Feb 2005 12:54:54 -0800,
Adrian Caceres <[EMAIL PROTECTED]> wrote:
>1. I keep getting Debug linux kernel messages when I enter KDB. I am
>doing it over
>a serial driver:
>"Debug: sleeping function called from invalid context at ..."
>Most of the time I get to a kdb console but sometimes I hang on an
>endless loop:
>The stack always seems to indicate the problem comes from
>kdb_getarea_size():
Sorry for the delay in replying - not waving, drowning ...
You have CONFIG_DEBUG_SPINLOCK_SLEEP=y so the kdb use of __copy_to_user
is generating false positives. When kdb uses that function, the
parameters are such that the call cannot sleep, but __copy_to_user does
not know that. Replace it with __copy_to_user_inatomic.
Does this patch fix your problem? Compiled but not tested.
Index: linux/include/asm-i386/kdb.h
===================================================================
--- linux.orig/include/asm-i386/kdb.h 2005-02-05 13:56:12.000000000 +1100
+++ linux/include/asm-i386/kdb.h 2005-03-03 17:14:04.000000000 +1100
@@ -68,7 +68,7 @@ __kdba_putarea_size(unsigned long to_xxx
}
set_fs(KERNEL_DS);
- r = __copy_to_user((void *)to_xxx, from, size);
+ r = __copy_to_user_inatomic((void *)to_xxx, from, size);
set_fs(oldfs);
return r;
}
@@ -88,19 +88,19 @@ __kdba_getarea_size(void *to, unsigned l
set_fs(KERNEL_DS);
switch (size) {
case 1:
- r = __copy_to_user(to, (void *)from_xxx, 1);
+ r = __copy_to_user_inatomic(to, (void *)from_xxx, 1);
break;
case 2:
- r = __copy_to_user(to, (void *)from_xxx, 2);
+ r = __copy_to_user_inatomic(to, (void *)from_xxx, 2);
break;
case 4:
- r = __copy_to_user(to, (void *)from_xxx, 4);
+ r = __copy_to_user_inatomic(to, (void *)from_xxx, 4);
break;
case 8:
- r = __copy_to_user(to, (void *)from_xxx, 8);
+ r = __copy_to_user_inatomic(to, (void *)from_xxx, 8);
break;
default:
- r = __copy_to_user(to, (void *)from_xxx, size);
+ r = __copy_to_user_inatomic(to, (void *)from_xxx, size);
break;
}
set_fs(oldfs);
---------------------------
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