linux-kernel - [PATCH 5/6] CRIS: use generic cmpxchg.h

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Date:	Thu, 19 Feb 2015 20:29:55 +0100
From:	Rabin Vincent <rabin@....in>
To:	jesper.nilsson@...s.com
Cc:	linux-cris-kernel@...s.com, linux-kernel@...r.kernel.org,
	Rabin Vincent <rabin@....in>
Subject: [PATCH 5/6] CRIS: use generic cmpxchg.h

CRIS can use asm-generic's cmpxchg.h

Signed-off-by: Rabin Vincent <rabin@....in>
---
 arch/cris/include/asm/Kbuild    |  1 +
 arch/cris/include/asm/cmpxchg.h | 51 -----------------------------------------
 2 files changed, 1 insertion(+), 51 deletions(-)
 delete mode 100644 arch/cris/include/asm/cmpxchg.h

diff --git a/arch/cris/include/asm/Kbuild b/arch/cris/include/asm/Kbuild
index 2f2787e..e189931 100644
--- a/arch/cris/include/asm/Kbuild
+++ b/arch/cris/include/asm/Kbuild
@@ -1,6 +1,7 @@
 generic-y += atomic.h
 generic-y += barrier.h
 generic-y += clkdev.h
+generic-y += cmpxchg.h
 generic-y += cputime.h
 generic-y += exec.h
 generic-y += irq_work.h
diff --git a/arch/cris/include/asm/cmpxchg.h b/arch/cris/include/asm/cmpxchg.h
deleted file mode 100644
index deb9048..0000000
--- a/arch/cris/include/asm/cmpxchg.h
+++ /dev/null
@@ -1,51 +0,0 @@
-#ifndef __ASM_CRIS_CMPXCHG__
-#define __ASM_CRIS_CMPXCHG__
-
-#include <linux/irqflags.h>
-
-static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
-{
-  /* since Etrax doesn't have any atomic xchg instructions, we need to disable
-     irq's (if enabled) and do it with move.d's */
-  unsigned long flags,temp;
-  local_irq_save(flags); /* save flags, including irq enable bit and shut off irqs */
-  switch (size) {
-  case 1:
-    *((unsigned char *)&temp) = x;
-    x = *(unsigned char *)ptr;
-    *(unsigned char *)ptr = *((unsigned char *)&temp);
-    break;
-  case 2:
-    *((unsigned short *)&temp) = x;
-    x = *(unsigned short *)ptr;
-    *(unsigned short *)ptr = *((unsigned short *)&temp);
-    break;
-  case 4:
-    temp = x;
-    x = *(unsigned long *)ptr;
-    *(unsigned long *)ptr = temp;
-    break;
-  }
-  local_irq_restore(flags); /* restore irq enable bit */
-  return x;
-}
-
-#define xchg(ptr,x) \
-	((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
-
-#define tas(ptr) (xchg((ptr),1))
-
-#include <asm-generic/cmpxchg-local.h>
-
-/*
- * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
- * them available.
- */
-#define cmpxchg_local(ptr, o, n)				 	       \
-	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
-			(unsigned long)(n), sizeof(*(ptr))))
-#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
-
-#include <asm-generic/cmpxchg.h>
-
-#endif /* __ASM_CRIS_CMPXCHG__ */
-- 
2.1.4

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