[K42-discussion] Problem with changing FairLock class

[Alex Depoutovitch]

The problem was because I did not recompile correctly linux modules.
After recompilation everything started to work properly.
Thank you for your help!

Alex


On 12/21/05, Bryan S Rosenburg <rosnbrg at us.ibm.com> wrote:
>
>
> I checked, and I don't think Marc's concern is the issue here.  The
> assembler code he's referring to is contained in inline asm statements that,
> as far as I can tell, reference the lock fields properly wherever they
> happen to be.
>
> Alex, you say you changed the size of spinlock_t to match your new
> FairBLock.  I assume you rebuilt your Linux modules after doing so?
>
> The only other possible problem I found (without actually trying to
> reproduce your experiment) is the k42_rtas_t struct in
> kitchsrc/os/kernel/bilge/arch/powerpc/BootInfo.H:
>
> struct k42_rtas_t {
>         uval64 entry;           /* physical address pointer */
>         uval64 base;            /* physical address pointer */
>         uval64 size;
>         //spinlock_t lock;
>         uval64 lock[2];
>
>         fill32;
>         struct device_node *dev;        /* virtual address pointer */
> };
>
> This is ugly, but maybe expanding the lock field there is needed.
>
> Your invalid memory access is happening early in Linux module
> initialization, so I'm guessing there's a size mismatch between the Linux
> stuff and K42, probably because something didn't get rebuilt properly.
>
> - Bryan
>
>
>
>   *Marc Auslander/Watson/Contr/IBM at IBMUS*
> Sent by: k42-discussion-bounces at ozlabs.org
>
> 12/20/2005 08:02 PM
>    To
> Alex Depoutovitch <siroko at gmail.com>  cc
> k42-discussion-bounces at ozlabs.org, k42-discussion at ozlabs.org  Subject
> Re: [K42-discussion] Problem with changing FairLock class
>
>
>
>
>
> IIRC, fairlock has machine dependent assembler code that actually
> implements it.  You need to make sure that the assembler code is consistent
> with your code.  I'm not sure this is the problem but you need to check.
>
> Marc Auslander <Marc_Auslander at us.ibm.com> 914 945-4346 (Fax x4282)
>
>   *Alex Depoutovitch <siroko at gmail.com>*
> Sent by: k42-discussion-bounces at ozlabs.org
>
> 12/20/2005 06:58 PM
>
>   To
> k42-discussion at ozlabs.org  cc
>   Subject
> [K42-discussion] Problem with changing FairLock class
>
>
>
>
>
>
> Hi,
> I tired to add data member to FairLock class. I changed size of
> spinlock_t structure accordingly so that they have the same size.
> But after I have done it K42 crashes during boot process with:
> ---
> .......
> NET: Registered protocol family 16
> /lewis/d/d1/depout/k42/kitchsrc/os/kernel/proc/ProcessShared.C,255:
> Invalid memory access: processID 0x0 addr 0x0, type
> -6917529026567294926
> GDB got trap: Data Storage Interrupt
> vector=0x300, sr=0xa00000004000b032, pc=0x0 lr=0xc000000002338020
> Kernel Connecting to GDB via thinwire channel
> -----
>
> Connecting with gdb does not help much as stack is corrupted and bt
> command returns:
> --
> (gdb) bt
> #0  0x0000000000000000 in ?? ()
> --
>
> Could anybody please tell me how to change size of FairLock structure
> in a right way? Any suggestions are really appreciated.
>
> Thank you,
>
> Alex
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