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| author | Nicholas Piggin <npiggin@gmail.com> | 2017-05-11 13:24:41 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-06-01 11:54:33 +0200 |
| commit | a2b05b7aa60e1e9b60faf01dfb1cca35638d1ab1 (patch) | |
| tree | 8099ff4a321f57dfdbb18eec41d357369c93a0b2 /Documentation | |
| parent | powerpc: Add PPC_FEATURE userspace bits for SCV and DARN instructions (diff) | |
| download | linux-a2b05b7aa60e1e9b60faf01dfb1cca35638d1ab1.tar.xz linux-a2b05b7aa60e1e9b60faf01dfb1cca35638d1ab1.zip | |
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.txt | 9 |
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 |