add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

 kernel/arch/arm64/kernel/fpsimd.c
..
..
@@ -159,6 +159,16 @@
159
159
 	__sve_free(task);
160
160
 }
161
161
 
162
+static void *sve_free_atomic(struct task_struct *task)
163
+{
164
+	void *sve_state = task->thread.sve_state;
165
+
166
+	WARN_ON(test_tsk_thread_flag(task, TIF_SVE));
167
+
168
+	task->thread.sve_state = NULL;
169
+	return sve_state;
170
+}
171
+
162
172
 /*
163
173
  * TIF_SVE controls whether a task can use SVE without trapping while
164
174
  * in userspace, and also the way a task's FPSIMD/SVE state is stored
..
..
@@ -549,6 +559,7 @@
549
559
 	 * non-SVE thread.
550
560
 	 */
551
561
 	if (task == current) {
562
+		preempt_disable();
552
563
 		local_bh_disable();
553
564
 
554
565
 		fpsimd_save();
..
..
@@ -559,8 +570,10 @@
559
570
 	if (test_and_clear_tsk_thread_flag(task, TIF_SVE))
560
571
 		sve_to_fpsimd(task);
561
572
 
562
-	if (task == current)
573
+	if (task == current) {
563
574
 		local_bh_enable();
575
+		preempt_enable();
576
+	}
564
577
 
565
578
 	/*
566
579
 	 * Force reallocation of task SVE state to the correct size
..
..
@@ -815,6 +828,7 @@
815
828
 
816
829
 	sve_alloc(current);
817
830
 
831
+	preempt_disable();
818
832
 	local_bh_disable();
819
833
 
820
834
 	fpsimd_save();
..
..
@@ -828,6 +842,7 @@
828
842
 		WARN_ON(1); /* SVE access shouldn't have trapped */
829
843
 
830
844
 	local_bh_enable();
845
+	preempt_enable();
831
846
 }
832
847
 
833
848
 /*
..
..
@@ -894,10 +909,12 @@
894
909
 void fpsimd_flush_thread(void)
895
910
 {
896
911
 	int vl, supported_vl;
912
+	void *mem = NULL;
897
913
 
898
914
 	if (!system_supports_fpsimd())
899
915
 		return;
900
916
 
917
+	preempt_disable();
901
918
 	local_bh_disable();
902
919
 
903
920
 	memset(&current->thread.uw.fpsimd_state, 0,
..
..
@@ -906,7 +923,7 @@
906
923
 
907
924
 	if (system_supports_sve()) {
908
925
 		clear_thread_flag(TIF_SVE);
909
-		sve_free(current);
926
+		mem = sve_free_atomic(current);
910
927
 
911
928
 		/*
912
929
 		 * Reset the task vector length as required.
..
..
@@ -942,6 +959,8 @@
942
959
 	set_thread_flag(TIF_FOREIGN_FPSTATE);
943
960
 
944
961
 	local_bh_enable();
962
+	preempt_enable();
963
+	kfree(mem);
945
964
 }
946
965
 
947
966
 /*
..
..
@@ -953,9 +972,11 @@
953
972
 	if (!system_supports_fpsimd())
954
973
 		return;
955
974
 
975
+	preempt_disable();
956
976
 	local_bh_disable();
957
977
 	fpsimd_save();
958
978
 	local_bh_enable();
979
+	preempt_enable();
959
980
 }
960
981
 
961
982
 /*
..
..
@@ -1026,6 +1047,7 @@
1026
1047
 		return;
1027
1048
 	}
1028
1049
 
1050
+	preempt_disable();
1029
1051
 	local_bh_disable();
1030
1052
 
1031
1053
 	if (test_and_clear_thread_flag(TIF_FOREIGN_FPSTATE)) {
..
..
@@ -1034,6 +1056,7 @@
1034
1056
 	}
1035
1057
 
1036
1058
 	local_bh_enable();
1059
+	preempt_enable();
1037
1060
 }
1038
1061
 
1039
1062
 /*
..
..
@@ -1046,6 +1069,7 @@
1046
1069
 	if (WARN_ON(!system_supports_fpsimd()))
1047
1070
 		return;
1048
1071
 
1072
+	preempt_disable();
1049
1073
 	local_bh_disable();
1050
1074
 
1051
1075
 	current->thread.uw.fpsimd_state = *state;
..
..
@@ -1058,6 +1082,7 @@
1058
1082
 	clear_thread_flag(TIF_FOREIGN_FPSTATE);
1059
1083
 
1060
1084
 	local_bh_enable();
1085
+	preempt_enable();
1061
1086
 }
1062
1087
 
1063
1088
 /*
..
..
@@ -1104,6 +1129,7 @@
1104
1129
 
1105
1130
 	BUG_ON(!may_use_simd());
1106
1131
 
1132
+	preempt_disable();
1107
1133
 	local_bh_disable();
1108
1134
 
1109
1135
 	__this_cpu_write(kernel_neon_busy, true);
..
..
@@ -1117,6 +1143,7 @@
1117
1143
 	preempt_disable();
1118
1144
 
1119
1145
 	local_bh_enable();
1146
+	preempt_enable();
1120
1147
 }
1121
1148
 EXPORT_SYMBOL(kernel_neon_begin);
1122
1149