6.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Will Deacon <will@xxxxxxxxxx> commit b8995a18417088bb53f87c49d200ec72a9dd4ec1 upstream. This reverts commit 2632e25217696712681dd1f3ecc0d71624ea3b23. 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@xxxxxxxxxxxxxxx Reported-by: Johannes Nixdorf <mixi@xxxxxxxxxxxxx> Link: https://lore.kernel.org/all/D1B7GPIR9K1E.5JFV37G0YTIF@xxxxxxxxxxxxx/ Signed-off-by: Will Deacon <will@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/arm64/include/asm/processor.h | 1 - arch/arm64/kernel/fpsimd.c | 18 ------------------ 2 files changed, 19 deletions(-) --- a/arch/arm64/include/asm/processor.h +++ b/arch/arm64/include/asm/processor.h @@ -169,7 +169,6 @@ struct thread_struct { struct debug_info debug; /* debugging */ struct user_fpsimd_state kernel_fpsimd_state; - unsigned int kernel_fpsimd_cpu; #ifdef CONFIG_ARM64_PTR_AUTH struct ptrauth_keys_user keys_user; #ifdef CONFIG_ARM64_PTR_AUTH_KERNEL --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -1492,30 +1492,12 @@ void do_fpsimd_exc(unsigned long esr, st static void fpsimd_load_kernel_state(struct task_struct *task) { - struct cpu_fp_state *last = this_cpu_ptr(&fpsimd_last_state); - - /* - * Elide the load if this CPU holds the most recent kernel mode - * FPSIMD context of the current task. - */ - if (last->st == &task->thread.kernel_fpsimd_state && - task->thread.kernel_fpsimd_cpu == smp_processor_id()) - return; - fpsimd_load_state(&task->thread.kernel_fpsimd_state); } static void fpsimd_save_kernel_state(struct task_struct *task) { - struct cpu_fp_state cpu_fp_state = { - .st = &task->thread.kernel_fpsimd_state, - .to_save = FP_STATE_FPSIMD, - }; - fpsimd_save_state(&task->thread.kernel_fpsimd_state); - fpsimd_bind_state_to_cpu(&cpu_fp_state); - - task->thread.kernel_fpsimd_cpu = smp_processor_id(); } void fpsimd_thread_switch(struct task_struct *next)
