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arm64/sme: Fix some comments of ARM SME

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When TIF_SME is clear, fpsimd_restore_current_state will disable
SME trap during ret_to_user, then SME access trap is impossible
in userspace, not SVE.

Besides, fix typo: alocated->allocated.

Signed-off-by: Dongxu Sun <sundongxu3@huawei.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230317124915.1263-5-sundongxu3@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Dongxu Sun
2023-03-17 20:49:15 +08:00
committed by Will Deacon
parent 19e99e7d59
commit 97b5576b01
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/kernel/fpsimd.c
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@ -299,7 +299,7 @@ void task_set_vl_onexec(struct task_struct *task, enum vec_type type,
/* /*
* TIF_SME controls whether a task can use SME without trapping while * TIF_SME controls whether a task can use SME without trapping while
* in userspace, when TIF_SME is set then we must have storage * in userspace, when TIF_SME is set then we must have storage
* alocated in sve_state and sme_state to store the contents of both ZA * allocated in sve_state and sme_state to store the contents of both ZA
* and the SVE registers for both streaming and non-streaming modes. * and the SVE registers for both streaming and non-streaming modes.
* *
* If both SVCR.ZA and SVCR.SM are disabled then at any point we * If both SVCR.ZA and SVCR.SM are disabled then at any point we
@ -1477,7 +1477,7 @@ void do_sve_acc(unsigned long esr, struct pt_regs *regs)
* *
* TIF_SME should be clear on entry: otherwise, fpsimd_restore_current_state() * TIF_SME should be clear on entry: otherwise, fpsimd_restore_current_state()
* would have disabled the SME access trap for userspace during * would have disabled the SME access trap for userspace during
* ret_to_user, making an SVE access trap impossible in that case. * ret_to_user, making an SME access trap impossible in that case.
*/ */
void do_sme_acc(unsigned long esr, struct pt_regs *regs) void do_sme_acc(unsigned long esr, struct pt_regs *regs)
{ {