sh: comment tidying for sh64->sh migration.

[mirror_ubuntu-bionic-kernel.git] / arch / sh / kernel / process_64.c

diff --git a/arch/sh/kernel/process_64.c b/arch/sh/kernel/process_64.c
index 973dd1a3d2924135c0c031ecbdd84527a2f966c8..cff3b7dc9c563e2fec79cf64aec1143d161101da 100644 (file)
--- a/arch/sh/kernel/process_64.c
+++ b/arch/sh/kernel/process_64.c
@@ -421,19 +421,22 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
  */
 void exit_thread(void)
 {
-       /* See arch/sparc/kernel/process.c for the precedent for doing this -- RPC.
-
-          The SH-5 FPU save/restore approach relies on last_task_used_math
-          pointing to a live task_struct.  When another task tries to use the
-          FPU for the 1st time, the FPUDIS trap handling (see
-          arch/sh64/kernel/fpu.c) will save the existing FPU state to the
-          FP regs field within last_task_used_math before re-loading the new
-          task's FPU state (or initialising it if the FPU has been used
-          before).  So if last_task_used_math is stale, and its page has already been
-          re-allocated for another use, the consequences are rather grim. Unless we
-          null it here, there is no other path through which it would get safely
-          nulled. */
-
+       /*
+        * See arch/sparc/kernel/process.c for the precedent for doing
+        * this -- RPC.
+        *
+        * The SH-5 FPU save/restore approach relies on
+        * last_task_used_math pointing to a live task_struct.  When
+        * another task tries to use the FPU for the 1st time, the FPUDIS
+        * trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the
+        * existing FPU state to the FP regs field within
+        * last_task_used_math before re-loading the new task's FPU state
+        * (or initialising it if the FPU has been used before).  So if
+        * last_task_used_math is stale, and its page has already been
+        * re-allocated for another use, the consequences are rather
+        * grim. Unless we null it here, there is no other path through
+        * which it would get safely nulled.
+        */
 #ifdef CONFIG_SH_FPU
        if (last_task_used_math == current) {
                last_task_used_math = NULL;