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Revert "arm64: fpsimd: Implement lazy restore for kernel mode FPSIMD"
This reverts commit 2632e25217
.
Johannes (and others) report data corruption with dm-crypt on Apple M1
which has been bisected to this change. Revert the offending commit
while we figure out what's going on.
Cc: stable@vger.kernel.org
Reported-by: Johannes Nixdorf <mixi@shadowice.org>
Link: https://lore.kernel.org/all/D1B7GPIR9K1E.5JFV37G0YTIF@shadowice.org/
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
parent
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@ -171,7 +171,6 @@ struct thread_struct {
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struct debug_info debug; /* debugging */
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struct user_fpsimd_state kernel_fpsimd_state;
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unsigned int kernel_fpsimd_cpu;
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#ifdef CONFIG_ARM64_PTR_AUTH
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struct ptrauth_keys_user keys_user;
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#ifdef CONFIG_ARM64_PTR_AUTH_KERNEL
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@ -1509,30 +1509,12 @@ void do_fpsimd_exc(unsigned long esr, struct pt_regs *regs)
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static void fpsimd_load_kernel_state(struct task_struct *task)
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{
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struct cpu_fp_state *last = this_cpu_ptr(&fpsimd_last_state);
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/*
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* Elide the load if this CPU holds the most recent kernel mode
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* FPSIMD context of the current task.
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*/
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if (last->st == &task->thread.kernel_fpsimd_state &&
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task->thread.kernel_fpsimd_cpu == smp_processor_id())
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return;
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fpsimd_load_state(&task->thread.kernel_fpsimd_state);
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}
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static void fpsimd_save_kernel_state(struct task_struct *task)
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{
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struct cpu_fp_state cpu_fp_state = {
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.st = &task->thread.kernel_fpsimd_state,
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.to_save = FP_STATE_FPSIMD,
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};
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fpsimd_save_state(&task->thread.kernel_fpsimd_state);
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fpsimd_bind_state_to_cpu(&cpu_fp_state);
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task->thread.kernel_fpsimd_cpu = smp_processor_id();
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}
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void fpsimd_thread_switch(struct task_struct *next)
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