lkml.org 
[lkml]   [2019]   [Feb]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] x86/boot: Move detecting acpi=off in cmdline to get_rsdp_addr()
On Fri, Feb 15, 2019 at 05:10:47PM +0800, Chao Fan wrote:
> If "acpi=off" specified in cmdline, the whole functions of acpi.c
> should not work, there is no need to ealy parse RSDP, so detect
> "acpi=off" in the very first place.
>
> Also replace magic number with macro.
>
> Signed-off-by: Chao Fan <fanc.fnst@cn.fujitsu.com>
> ---
> arch/x86/boot/compressed/acpi.c | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
> index 0ef4ad55b29b..5510a2105b7b 100644
> --- a/arch/x86/boot/compressed/acpi.c
> +++ b/arch/x86/boot/compressed/acpi.c
> @@ -213,8 +213,13 @@ static acpi_physical_address bios_get_rsdp_addr(void)
> /* Return RSDP address on success, otherwise 0. */
> acpi_physical_address get_rsdp_addr(void)
> {
> + char arg[MAX_ACPI_ARG_LENGTH];
> acpi_physical_address pa;
>
> + if (cmdline_find_option("acpi", arg, sizeof(arg)) == 3 &&
> + !strncmp(arg, "off", 3))
> + return 0;

This place looks wrong because we have a get_acpi_rsdp() call before
that which overrides acpi=off practically.

Also, if you move it to get_rsdp_addr(), add a static variable recording
the previous result of the cmdline parsing because I don't want it
parsing cmdline each time it is called.

Thx.

--
Regards/Gruss,
Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

\
 
 \ /
  Last update: 2019-02-15 10:29    [W:0.054 / U:9.196 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site