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authorNicholas Piggin <npiggin@gmail.com>2017-05-11 14:24:41 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2017-06-01 12:54:33 +0300
commita2b05b7aa60e1e9b60faf01dfb1cca35638d1ab1 (patch)
tree8099ff4a321f57dfdbb18eec41d357369c93a0b2 /Documentation
parenta4700a26107241cc7b9ac8528b2c6714ff99983d (diff)
downloadlinux-a2b05b7aa60e1e9b60faf01dfb1cca35638d1ab1.tar.xz
powerpc/64s: Add dt_cpu_ftrs boot time setup option
Provide a dt_cpu_ftrs= cmdline option to disable the dt_cpu_ftrs CPU feature discovery, and fall back to the "cputable" based version. Also allow control of advertising unknown features to userspace and with this parameter, and remove the clunky CONFIG option. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Add explicit early check of bootargs in dt_cpu_ftrs_init()] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/admin-guide/kernel-parameters.txt9
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 15f79c27748d..0f5c3b4347c6 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -866,6 +866,15 @@
dscc4.setup= [NET]
+ dt_cpu_ftrs= [PPC]
+ Format: {"off" | "known"}
+ Control how the dt_cpu_ftrs device-tree binding is
+ used for CPU feature discovery and setup (if it
+ exists).
+ off: Do not use it, fall back to legacy cpu table.
+ known: Do not pass through unknown features to guests
+ or userspace, only those that the kernel is aware of.
+
dump_apple_properties [X86]
Dump name and content of EFI device properties on
x86 Macs. Useful for driver authors to determine