[lkml]   [2007]   [Jan]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Subject[patch 00/26] Dynamic kernel command-line
This patch has already been posted by Alon Bar-Lev <>
in 2nd Dec 2006. He didn't get any response. Because I think that this
patch would be really useful being able to increase the command line, I
post this patch again to get some response.

This patches are against 2.6.20-rc4-mm1.

Current implementation stores a static command-line buffer allocated to
COMMAND_LINE_SIZE size. Most architectures stores two copies of this
buffer, one for future reference and one for parameter parsing.

Current kernel command-line size for most architecture is much too small
for module parameters, video settings, initramfs parameters and much
more. The problem is that setting COMMAND_LINE_SIZE to a grater value,
allocates static buffers.

In order to allow a greater command-line size, these buffers should be
dynamically allocated or marked as init disposable buffers, so unused
memory can be released.

This patch renames the static saved_command_line variable into
boot_command_line adding __initdata attribute, so that it can be
disposed after initialization. This rename is required so applications
that use saved_command_line will not be affected by this change.

It reintroduces saved_command_line as dynamically allocated buffer to
match the data in boot_command_line.

It also mark secondary command-line buffer as __initdata, and copies it
to dynamically allocated static_command_line buffer components may hold
reference to it after initialization.

This patch is for linux-2.6.19 and is divided to target each
architecture. I could not check this in any architecture so please
forgive me if I got it wrong.

The per-architecture modification is very simple, use boot_command_line
in place of saved_command_line. The common code is the change into
dynamic command-line.

Signed-off-by: Alon Bar-Lev <>

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-01-18 15:05    [W:0.135 / U:10.088 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site