linux-kernel - Re: linux-next: parsing mem=700M broken

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Date:	Mon, 22 Dec 2008 21:52:19 -0800
From:	"Yinghai Lu" <yinghai@...nel.org>
To:	"Hugh Dickins" <hugh@...itas.com>, "Ingo Molnar" <mingo@...e.hu>
Cc:	"Rusty Russell" <rusty@...tcorp.com.au>,
	"Stephen Rothwell" <sfr@...b.auug.org.au>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: linux-next: parsing mem=700M broken

On Mon, Dec 22, 2008 at 7:06 PM, Hugh Dickins <hugh@...itas.com> wrote:
> Hi Rusty,
>
> I find that bootparam "mem=700M" isn't working in linux-next or mmotm,
> and have bisected it down to your patch below; but now I'm off to bed
> without working out just what goes wrong (I'll bet it's the "=").
>
> Hugh
>
> commit 5c886584a758edba7e25ad9df974cf15a4a1f59d
> Author: Rusty Russell <rusty@...tcorp.com.au>
> Date:   Wed Dec 3 13:34:34 2008 +1030
>
>    Call early_param earlier.
>
>    We delete all the arch calls: we call it from start_kernel earlier
>    now.  We also no longer take a temporary copy, but parse in place.
>
>    Note: IA64 needs to parse "machvec=" before other commandline options
>    but machvec_init_from_cmdline() needs efi_init() and io_port_init(),
>    so they are all moved into arch_get_boot_command_line().
>

yeah, you are right.

static int __init parse_memopt(char *p)
{
        u64 mem_size;

        if (!p)
                return -EINVAL;

#ifdef CONFIG_X86_32
        if (!strcmp(p, "nopentium")) {
                setup_clear_cpu_cap(X86_FEATURE_PSE);
                return 0;
        }
#endif

        userdef = 1;
        mem_size = memparse(p, &p);
        e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);

        return 0;
}
early_param("mem", parse_memopt);


in x86 we use that param analyser much later ( after we check the e820 table..)

other cpu flag will be overwrite too..

anyway, this patch is not go through x86 tip..., some strange!

YH
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