diff options
| author | Len Brown <len.brown@intel.com> | 2015-05-11 17:27:09 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-12 08:54:32 +0200 |
| commit | d68921f9bd148359e6d01c84aaa2e32bfbd82970 (patch) | |
| tree | 63a26b919eea60a11495bedf34e069b672469e8d /Documentation/kernel-parameters.txt | |
| parent | 191a66353b22fad8ac89404ab4c929cbe7b0afb2 (diff) | |
| download | lwn-d68921f9bd148359e6d01c84aaa2e32bfbd82970.tar.gz lwn-d68921f9bd148359e6d01c84aaa2e32bfbd82970.zip | |
x86/smp/boot: Add cmdline "cpu_init_udelay=N" to specify cpu_up() delay
No change to default behavior.
Replace the hard-coded mdelay(10) in cpu_up() with a variable
udelay, that is set to a defined default -- rather than a magic
number.
Add a boot-time override, "cpu_init_udelay=N"
Signed-off-by: Len Brown <len.brown@intel.com>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jan H. Schönherr <jschoenh@amazon.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/2fe8e6c798e8def271122f62df9bbf58dc283e2a.1431379433.git.len.brown@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 61ab1628a057..a320a41e7412 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -746,6 +746,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. cpuidle.off=1 [CPU_IDLE] disable the cpuidle sub-system + cpu_init_udelay=N + [X86] Delay for N microsec between assert and de-assert + of APIC INIT to start processors. This delay occurs + on every CPU online, such as boot, and resume from suspend. + Default: 10000 + cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver Format: <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>] |