linux-kernel - Re: [PATCH v4 resend] OLPC: Add XO-1 suspend/resume support

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Date:	Fri, 26 Nov 2010 10:43:18 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Daniel Drake <dsd@...top.org>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 resend] OLPC: Add XO-1 suspend/resume support

On Thu, 18 Nov 2010, Daniel Drake wrote:
> Feedback after the first submission was quickly acted upon and I haven't been
> able to get a peep since.

Sorry, fell off the radar.

> +
> +wakeup_start:
> +#	jmp wakeup_start

  Debug leftover ?

> +asmlinkage int olpc_xo1_do_sleep(u8 sleep_state)
> +{
> +	void *pgd_addr = __va(read_cr3());
> +	printk(KERN_ERR "xo1_do_sleep!\n"); /* this needs to remain here so
> +					      * that gcc doesn't optimize
> +					      * away our __va! */
> +

  This looks suspect along with the __volatile__ magic below. Care to
  explain, what you fear that gcc is optimizing away ?

> +	/* Enable wakeup through power button */
> +	outl((CS5536_PM_PWRBTN << 16) | 0xFFFF, acpi_base + PM1_STS);
> +
> +	__asm__ __volatile__("movl %0,%%eax" : : "r" (pgd_addr));
> +	__asm__("call *(%%edi); cld"
> +		: : "D" (&ofw_bios_entry));
> +	__asm__ __volatile__("movb $0x34, %al\n\t"
> +			     "outb %al, $0x70\n\t"
> +			     "movb $0x30, %al\n\t"
> +			     "outb %al, $0x71\n\t");

Looks good otherwise.

Thanks,

	tglx
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