[parisc-linux] not freeing initmem?

[parisc-linux] not freeing initmem?

[Ralf Hildebrandt]

Re: [parisc-linux] not freeing initmem?

[Helge Deller]

There is still one or more __init 's too much somewhere. 
If we would free the memory without fixing/finding this place first, 
the kernel will crash.

Helge

On Wednesday 06 March 2002 16:19, Ralf Hildebrandt wrote:
> From my dmesg output of the recent 2.4.18-pa3:
>
> ...
> EXT3-fs: mounted filesystem with ordered data mode.
> VFS: Mounted root (ext3 filesystem) readonly.
> NOT FREEING INITMEM (351k)
> Adding Swap: 124800k swap-space (priority -1)
> EXT3 FS 2.4-0.9.17, 10 Jan 2002 on sd(8,3), internal journal
> ...
>
> What does that mean? Why is the memory not freed on PA-RISC, but freed
> on x86?
>
> On my x86 box:
>
> ...
> EXT3-fs: mounted filesystem with ordered data mode.
> VFS: Mounted root (ext3 filesystem) readonly.
> Freeing unused kernel memory: 224k freed
> EXT3 FS 2.4-0.9.17, 10 Jan 2002 on ide0(3,2), internal journal
> Real Time Clock Driver v1.10e
> ...

-- 
Helge Deller
SAP AG - LinuxLab and Unix Platforms
email: helge.deller@sap.com
Phone: +49 6227 7 - 67783

Re: [parisc-linux] not freeing initmem?

[Ralf Hildebrandt]

Am 06.03.2002 um 16:19:13 +0100 schrieb Ralf Hildebrandt folgendes:

> What does that mean? Why is the memory not freed on PA-RISC, but freed
> on x86?

OK, I grepped for that string and found the infamous FIXME:

/* FIXME: */
        printk(KERN_INFO "NOT FREEING INITMEM (%dk)\n",
                        (&__init_end - &__init_begin) >> 10);
        return;			

OTOH, why does the code below that not work for PA-RISC?

Re: [parisc-linux] not freeing initmem?

[Alan Cox]

> There is still one or more __init 's too much somewhere. 
> If we would free the memory without fixing/finding this place first, 
> the kernel will crash.

Disable interrupts, memset all the freed pages to an invalid instruction in
parisc asm at the point you free the init pages, then re-enable ints and
the traceback should give you a direct stack trace to the offender