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x86: various changes and cleanups to in_p/out_p delay details

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various changes to the in_p/out_p delay details:

- add the io_delay=none method
- make each method selectable from the kernel config
- simplify the delay code a bit by getting rid of an indirect function call
- add the /proc/sys/kernel/io_delay_type sysctl
- change 'io_delay=standard|alternate' to io_delay=0x80 and io_delay=0xed
- make the io delay config not depend on CONFIG_DEBUG_KERNEL

Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: "David P. Reed" <[email protected]>
This commit is contained in:
Ingo Molnar 2008-01-30 13:30:05 +01:00
commit 6e7c402590
6 changed files with 143 additions and 83 deletions
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12
Documentation/kernel-parameters.txt
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@ -795,12 +795,14 @@ and is between 256 and 4096 characters. It is defined in the file
then look in the higher range.
io_delay= [X86-32,X86-64] I/O delay method
standard
Standard port 0x80 delay
alternate
Alternate port 0xed delay
0x80
Standard port 0x80 based delay
0xed
Alternate port 0xed based delay (needed on some systems)
udelay
Simple two microsecond delay
Simple two microseconds delay
none
No delay
io7= [HW] IO7 for Marvel based alpha systems
See comment before marvel_specify_io7 in