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| author | Mark Brown <broonie@kernel.org> | 2024-01-24 21:12:37 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2024-02-21 21:02:46 +0300 |
| commit | 3fd97cf3234c5ffbd420319d1d510e4940183843 (patch) | |
| tree | 8602c6036df4e1f59b308439edc4e9fcb0b34281 /Documentation/arch | |
| parent | ae35792764bcba1dc13d2de62480eae8b97c2c41 (diff) | |
| download | linux-3fd97cf3234c5ffbd420319d1d510e4940183843.tar.xz | |
arm64/fp: Clarify effect of setting an unsupported system VL
The documentation for system vector length configuration does not cover all
cases where unsupported values are written, tighten it up.
Reported-by: Edmund Grimley-Evans <edmund.grimley-evans@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Link: https://lore.kernel.org/r/20240124-arm64-sve-sme-doc-v2-3-fe3964fb3c19@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'Documentation/arch')
| -rw-r--r-- | Documentation/arch/arm64/sme.rst | 5 | ||||
| -rw-r--r-- | Documentation/arch/arm64/sve.rst | 5 |
2 files changed, 4 insertions, 6 deletions
diff --git a/Documentation/arch/arm64/sme.rst b/Documentation/arch/arm64/sme.rst index 3133d0e91b48..f4376c06f447 100644 --- a/Documentation/arch/arm64/sme.rst +++ b/Documentation/arch/arm64/sme.rst @@ -379,9 +379,8 @@ The regset data starts with struct user_za_header, containing: /proc/sys/abi/sme_default_vector_length Writing the text representation of an integer to this file sets the system - default vector length to the specified value, unless the value is greater - than the maximum vector length supported by the system in which case the - default vector length is set to that maximum. + default vector length to the specified value rounded to a supported value + using the same rules as for setting vector length via PR_SME_SET_VL. The result can be determined by reopening the file and reading its contents. diff --git a/Documentation/arch/arm64/sve.rst b/Documentation/arch/arm64/sve.rst index b45a2da19bf1..8d8837fc39ec 100644 --- a/Documentation/arch/arm64/sve.rst +++ b/Documentation/arch/arm64/sve.rst @@ -423,9 +423,8 @@ The regset data starts with struct user_sve_header, containing: /proc/sys/abi/sve_default_vector_length Writing the text representation of an integer to this file sets the system - default vector length to the specified value, unless the value is greater - than the maximum vector length supported by the system in which case the - default vector length is set to that maximum. + default vector length to the specified value rounded to a supported value + using the same rules as for setting vector length via PR_SVE_SET_VL. The result can be determined by reopening the file and reading its contents. |