Merge branch 'linus' into x86/mm, to refresh the branch and pick up fixes

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 26 insertions, 9 deletions

diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index dc17896a001a..c0b6e74d899a 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -184,11 +184,7 @@ struct thread_struct {
 	struct gs_cb *gs_cb;			/* Current guarded storage cb */
 	struct gs_cb *gs_bc_cb;			/* Broadcast guarded storage cb */
 	struct pgm_tdb trap_tdb;		/* Transaction abort diagnose block */
-	/*
-	 * Warning: 'fpu' is dynamically-sized. It *MUST* be at
-	 * the end.
-	 */
-	struct fpu fpu;			/* FP and VX register save area */
+	struct fpu fpu;				/* FP and VX register save area */
 };
 
 /* Flag to disable transactions. */
@@ -228,7 +224,6 @@ typedef struct thread_struct thread_struct;
 	execve_tail();							\
 } while (0)
 
-/* Forward declaration, a strange C thing */
 struct task_struct;
 struct mm_struct;
 struct seq_file;
@@ -332,14 +327,36 @@ static inline unsigned long __extract_psw(void)
 	return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
 }
 
-static inline void local_mcck_enable(void)
+static inline unsigned long __local_mcck_save(void)
 {
-	__load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
+	unsigned long mask = __extract_psw();
+
+	__load_psw_mask(mask & ~PSW_MASK_MCHECK);
+	return mask & PSW_MASK_MCHECK;
+}
+
+#define local_mcck_save(mflags)			\
+do {						\
+	typecheck(unsigned long, mflags);	\
+	mflags = __local_mcck_save();		\
+} while (0)
+
+static inline void local_mcck_restore(unsigned long mflags)
+{
+	unsigned long mask = __extract_psw();
+
+	mask &= ~PSW_MASK_MCHECK;
+	__load_psw_mask(mask | mflags);
 }
 
 static inline void local_mcck_disable(void)
 {
-	__load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
+	__local_mcck_save();
+}
+
+static inline void local_mcck_enable(void)
+{
+	__load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
 }
 
 /*