powerpc/irq: Don't open code irq_soft_mask helpers

Use READ_ONCE() and WRITE_ONCE() instead of open coding
read and write of local PACA irq_soft_mask.

For the write, add a barrier to keep the memory clobber
that was there previously.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/e2454434992cc932a5a34b695ae981c0b2f4c28e.1652862729.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h
index 674e5aa..edc5694 100644 (file)
--- a/arch/powerpc/include/asm/hw_irq.h
+++ b/arch/powerpc/include/asm/hw_irq.h
@@ -113,14 +113,7 @@ static inline void __hard_RI_enable(void)
 
 static inline notrace unsigned long irq_soft_mask_return(void)
 {
-       unsigned long flags;
-
-       asm volatile(
-               "lbz %0,%1(13)"
-               : "=r" (flags)
-               : "i" (offsetof(struct paca_struct, irq_soft_mask)));
-
-       return flags;
+       return READ_ONCE(local_paca->irq_soft_mask);
 }
 
 /*
@@ -148,46 +141,24 @@ static inline notrace void irq_soft_mask_set(unsigned long mask)
        WARN_ON(mask && !(mask & IRQS_DISABLED));
 #endif
 
-       asm volatile(
-               "stb %0,%1(13)"
-               :
-               : "r" (mask),
-                 "i" (offsetof(struct paca_struct, irq_soft_mask))
-               : "memory");
+       WRITE_ONCE(local_paca->irq_soft_mask, mask);
+       barrier();
 }
 
 static inline notrace unsigned long irq_soft_mask_set_return(unsigned long mask)
 {
-       unsigned long flags;
-
-#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
-       WARN_ON(mask && !(mask & IRQS_DISABLED));
-#endif
+       unsigned long flags = irq_soft_mask_return();
 
-       asm volatile(
-               "lbz %0,%1(13); stb %2,%1(13)"
-               : "=&r" (flags)
-               : "i" (offsetof(struct paca_struct, irq_soft_mask)),
-                 "r" (mask)
-               : "memory");
+       irq_soft_mask_set(mask);
 
        return flags;
 }
 
 static inline notrace unsigned long irq_soft_mask_or_return(unsigned long mask)
 {
-       unsigned long flags, tmp;
-
-       asm volatile(
-               "lbz %0,%2(13); or %1,%0,%3; stb %1,%2(13)"
-               : "=&r" (flags), "=r" (tmp)
-               : "i" (offsetof(struct paca_struct, irq_soft_mask)),
-                 "r" (mask)
-               : "memory");
+       unsigned long flags = irq_soft_mask_return();
 
-#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
-       WARN_ON((mask | flags) && !((mask | flags) & IRQS_DISABLED));
-#endif
+       irq_soft_mask_set(flags | mask);
 
        return flags;
 }