From 3c0979c64481f07a6bf9c1775601845ac5fa57f3 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Wed, 23 Jul 2025 13:27:45 +0100 Subject: [PATCH] arm64/sme: Drop inaccurate documentation of streaming mode switches The SME ABI documentation contains an inaccurate description of the architectural streaming mode entry/exit behaviour, just remove it since this is better documented by the architecture or with the rest of the documentation for the specific software interfaces concerned. Signed-off-by: Mark Brown Signed-off-by: Will Deacon --- Documentation/arch/arm64/sme.rst | 14 ++------------ 1 file changed, 2 insertions(+), 12 deletions(-) diff --git a/Documentation/arch/arm64/sme.rst b/Documentation/arch/arm64/sme.rst index 4cb38330e7046..583f2ee9cb977 100644 --- a/Documentation/arch/arm64/sme.rst +++ b/Documentation/arch/arm64/sme.rst @@ -81,17 +81,7 @@ The ZA matrix is square with each side having as many bytes as a streaming mode SVE vector. -3. Sharing of streaming and non-streaming mode SVE state ---------------------------------------------------------- - -It is implementation defined which if any parts of the SVE state are shared -between streaming and non-streaming modes. When switching between modes -via software interfaces such as ptrace if no register content is provided as -part of switching no state will be assumed to be shared and everything will -be zeroed. - - -4. System call behaviour +3. System call behaviour ------------------------- * On syscall PSTATE.ZA is preserved, if PSTATE.ZA==1 then the contents of the @@ -112,7 +102,7 @@ be zeroed. exceptions for execve() described in section 6. -5. Signal handling +4. Signal handling ------------------- * Signal handlers are invoked with PSTATE.SM=0, PSTATE.ZA=0, and TPIDR2_EL0=0. -- 2.47.3