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Message-ID: <56CC1C1C.6030405@linux.vnet.ibm.com>
Date: Tue, 23 Feb 2016 16:45:16 +0800
From: Pan Xinhui <xinhui@...ux.vnet.ibm.com>
To: linuxppc-dev@...ts.ozlabs.org,
open list <"linux-kernel"@vger.kernel.org>
CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
Boqun Feng <boqun.feng@...il.com>,
"'Peter Zijlstra (Intel)\"" <peterz@...radead.org>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] arch/powerpc: use BUILD_BUG() when detect unfit {cmp}xchg,
size
From: pan xinhui <xinhui.pan@...ux.vnet.ibm.com>
__xchg_called_with_bad_pointer() can't tell us what codes use {cmp}xchg
in incorrect way. And no error will be reported until the link stage.
To fix such kinds of issues in a easy way, we use BUILD_BUG() here.
Signed-off-by: pan xinhui <xinhui.pan@...ux.vnet.ibm.com>
---
arch/powerpc/include/asm/cmpxchg.h | 19 +++++--------------
1 file changed, 5 insertions(+), 14 deletions(-)
diff --git a/arch/powerpc/include/asm/cmpxchg.h b/arch/powerpc/include/asm/cmpxchg.h
index d1a8d93..20c0a30 100644
--- a/arch/powerpc/include/asm/cmpxchg.h
+++ b/arch/powerpc/include/asm/cmpxchg.h
@@ -5,6 +5,7 @@
#include <linux/compiler.h>
#include <asm/synch.h>
#include <asm/asm-compat.h>
+#include <linux/bug.h>
/*
* Atomic exchange
@@ -92,12 +93,6 @@ __xchg_u64_local(volatile void *p, unsigned long val)
}
#endif
-/*
- * This function doesn't exist, so you'll get a linker error
- * if something tries to do an invalid xchg().
- */
-extern void __xchg_called_with_bad_pointer(void);
-
static __always_inline unsigned long
__xchg(volatile void *ptr, unsigned long x, unsigned int size)
{
@@ -109,7 +104,7 @@ __xchg(volatile void *ptr, unsigned long x, unsigned int size)
return __xchg_u64(ptr, x);
#endif
}
- __xchg_called_with_bad_pointer();
+ BUILD_BUG();
return x;
}
@@ -124,7 +119,7 @@ __xchg_local(volatile void *ptr, unsigned long x, unsigned int size)
return __xchg_u64_local(ptr, x);
#endif
}
- __xchg_called_with_bad_pointer();
+ BUILD_BUG();
return x;
}
#define xchg(ptr,x) \
@@ -235,10 +230,6 @@ __cmpxchg_u64_local(volatile unsigned long *p, unsigned long old,
}
#endif
-/* This function doesn't exist, so you'll get a linker error
- if something tries to do an invalid cmpxchg(). */
-extern void __cmpxchg_called_with_bad_pointer(void);
-
static __always_inline unsigned long
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
unsigned int size)
@@ -251,7 +242,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
return __cmpxchg_u64(ptr, old, new);
#endif
}
- __cmpxchg_called_with_bad_pointer();
+ BUILD_BUG();
return old;
}
@@ -267,7 +258,7 @@ __cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new,
return __cmpxchg_u64_local(ptr, old, new);
#endif
}
- __cmpxchg_called_with_bad_pointer();
+ BUILD_BUG();
return old;
}
--
2.5.0
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