From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org, Mark Brown <broonie@kernel.org>
Subject: [PATCH 1/3] arm64/sme: Fix context switch for SME only systems
Date: Tue, 27 Dec 2022 17:12:04 +0000 [thread overview]
Message-ID: <20221223-arm64-fix-sme-only-v1-1-938d663f69e5@kernel.org> (raw)
In-Reply-To: <20221223-arm64-fix-sme-only-v1-0-938d663f69e5@kernel.org>
When refactoring fpsimd_load() to support keeping SVE enabled over syscalls
support for systems with SME but not SVE was broken. The code that selects
between loading regular FPSIMD and SVE states was guarded by using
system_supports_sve() but is also needed to handle the streaming SVE state
in SME only systems where that check will be false. Fix this by also
checking for system_supports_sme().
Fixes: a0136be443d ("arm64/fpsimd: Load FP state based on recorded data type")
Signed-off-by: Mark Brown <broonie@kernel.org>
---
arch/arm64/kernel/fpsimd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index dcc81e7200d4..b6ef1af0122e 100644
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -385,7 +385,7 @@ static void task_fpsimd_load(void)
WARN_ON(!system_supports_fpsimd());
WARN_ON(!have_cpu_fpsimd_context());
- if (system_supports_sve()) {
+ if (system_supports_sve() || system_supports_sme()) {
switch (current->thread.fp_type) {
case FP_STATE_FPSIMD:
/* Stop tracking SVE for this task until next use. */
--
2.30.2
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next prev parent reply other threads:[~2022-12-27 17:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-27 17:12 [PATCH 0/3] arm64/sme: Fixes for SME only support Mark Brown
2022-12-27 17:12 ` Mark Brown [this message]
2022-12-27 17:12 ` [PATCH 2/3] arm64/signal: Always accept SVE signal frames on SME only systems Mark Brown
2022-12-27 17:12 ` [PATCH 3/3] arm64/signal: Always allocate " Mark Brown
2023-01-05 15:22 ` [PATCH 0/3] arm64/sme: Fixes for SME only support Will Deacon
2023-01-05 15:29 ` Will Deacon
2023-01-05 16:00 ` Mark Brown
2023-01-05 15:47 ` Mark Brown
2023-01-05 18:03 ` Will Deacon
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