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arm64/fp: Clarify effect of setting an unsupported system VL

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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>
This commit is contained in:
Mark Brown 2024-01-24 18:12:37 +00:00 committed by Catalin Marinas
parent ae35792764
commit 3fd97cf323
2 changed files with 4 additions and 6 deletions
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5
Documentation/arch/arm64/sme.rst
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@ -379,9 +379,8 @@ The regset data starts with struct user_za_header, containing:
/proc/sys/abi/sme_default_vector_length /proc/sys/abi/sme_default_vector_length
Writing the text representation of an integer to this file sets the system 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 default vector length to the specified value rounded to a supported value
than the maximum vector length supported by the system in which case the using the same rules as for setting vector length via PR_SME_SET_VL.
default vector length is set to that maximum.
The result can be determined by reopening the file and reading its The result can be determined by reopening the file and reading its
contents. contents.

5
Documentation/arch/arm64/sve.rst
View File

@ -423,9 +423,8 @@ The regset data starts with struct user_sve_header, containing:
/proc/sys/abi/sve_default_vector_length /proc/sys/abi/sve_default_vector_length
Writing the text representation of an integer to this file sets the system 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 default vector length to the specified value rounded to a supported value
than the maximum vector length supported by the system in which case the using the same rules as for setting vector length via PR_SVE_SET_VL.
default vector length is set to that maximum.
The result can be determined by reopening the file and reading its The result can be determined by reopening the file and reading its
contents. contents.