Merge tag 'v4.8' into patchwork

[cascardo/linux.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index a4f4d69..7b550d4 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1688,7 +1688,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        intel_idle.max_cstate=  [KNL,HW,ACPI,X86]
                        0       disables intel_idle and fall back on acpi_idle.
-                       1 to 6  specify maximum depth of C-state.
+                       1 to 9  specify maximum depth of C-state.
 
        intel_pstate=  [X86]
                       disable
@@ -2161,10 +2161,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        than or equal to this physical address is ignored.
 
        maxcpus=        [SMP] Maximum number of processors that an SMP kernel
-                       should make use of.  maxcpus=n : n >= 0 limits the
-                       kernel to using 'n' processors.  n=0 is a special case,
-                       it is equivalent to "nosmp", which also disables
-                       the IO APIC.
+                       will bring up during bootup.  maxcpus=n : n >= 0 limits
+                       the kernel to bring up 'n' processors. Surely after
+                       bootup you can bring up the other plugged cpu by executing
+                       "echo 1 > /sys/devices/system/cpu/cpuX/online". So maxcpus
+                       only takes effect during system bootup.
+                       While n=0 is a special case, it is equivalent to "nosmp",
+                       which also disables the IO APIC.
 
        max_loop=       [LOOP] The number of loop block devices that get
        (loop.max_loop) unconditionally pre-created at init time. The default
@@ -2571,8 +2574,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        nodelayacct     [KNL] Disable per-task delay accounting
 
-       nodisconnect    [HW,SCSI,M68K] Disables SCSI disconnects.
-
        nodsp           [SH] Disable hardware DSP at boot time.
 
        noefi           Disable EFI runtime services support.
@@ -2773,9 +2774,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        nr_cpus=        [SMP] Maximum number of processors that an SMP kernel
                        could support.  nr_cpus=n : n >= 1 limits the kernel to
-                       supporting 'n' processors. Later in runtime you can not
-                       use hotplug cpu feature to put more cpu back to online.
-                       just like you compile the kernel NR_CPUS=n
+                       support 'n' processors. It could be larger than the
+                       number of already plugged CPU during bootup, later in
+                       runtime you can physically add extra cpu until it reaches
+                       n. So during boot up some boot time memory for per-cpu
+                       variables need be pre-allocated for later physical cpu
+                       hot plugging.
 
        nr_uarts=       [SERIAL] maximum number of UARTs to be registered.