On Tue, 2005-06-14 at 21:38 +0200, Jakub Bogusz wrote:
> This patch avoids recursive crash (leading to kernel stack overflow) in
> die() on CHRP/PReP machines when CONFIG_PMAC_BACKLIGHT=y.
> set_backlight_* functions are placed in pmac section, which is discarded
> when _machine != _MACH_Pmac.
>
> I already posted this patch to LKML few months ago:
> http://www.ussg.iu.edu/hypermail/linux/kernel/0412.0/0300.html
> and it has been applied to linux-2.4 tree, but still not 2.6.
> (patch was made against 2.4.27, but still applies cleanly against
> kernels up to 2.6.11.12)
>
> Signed-off-by: Jakub Bogusz <[email protected]>
Acked-by: Benjamin Herrenschmidt <[email protected]>
> --- linux-2.4.27/arch/ppc/kernel/traps.c.orig Wed Apr 14 15:05:27 2004
> +++ linux-2.4.27/arch/ppc/kernel/traps.c Mon Nov 29 19:05:28 2004
> @@ -88,8 +88,10 @@
> console_verbose();
> spin_lock_irq(&die_lock);
> #ifdef CONFIG_PMAC_BACKLIGHT
> - set_backlight_enable(1);
> - set_backlight_level(BACKLIGHT_MAX);
> + if (_machine == _MACH_Pmac) {
> + set_backlight_enable(1);
> + set_backlight_level(BACKLIGHT_MAX);
> + }
> #endif
> printk("Oops: %s, sig: %ld\n", str, err);
> show_regs(fp);
>
>
-
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