Re: [PATCH] Fix compilation of drivers with -O0

From: Michal Schmidt
Date: Fri Feb 23 2007 - 11:12:23 EST

[that still wasn't right, here's for the 3rd and final time.]

It is sometimes useful to compile individual drivers with optimization
disabled for easier debugging. Currently drivers which use htonl() and
similar functions don't compile with -O0. This patch fixes it.
It also removes obsolete and misleading comments. This header is not
for userspace, so we don't have to care about strange programs these
comments mention.

Signed-off-by: Michal Schmidt <mschmidt@xxxxxxxxxx>

diff --git a/include/linux/byteorder/generic.h b/include/linux/byteorder/generic.h
index e86e4a9..3dc715b 100644
--- a/include/linux/byteorder/generic.h
+++ b/include/linux/byteorder/generic.h
@@ -124,19 +124,8 @@
#define be32_to_cpus __be32_to_cpus
#define cpu_to_be16s __cpu_to_be16s
#define be16_to_cpus __be16_to_cpus

-#if defined(__KERNEL__)
- * Handle ntohl and suches. These have various compatibility
- * issues - like we want to give the prototype even though we
- * also have a macro for them in case some strange program
- * wants to take the address of the thing or something..
- *
- * Note that these used to return a "long" in libc5, even though
- * long is often 64-bit these days.. Thus the casts.
- *
* They have to be macros in order to do the constant folding
* correctly - if the argument passed into a inline function
* it is no longer constant according to gcc..
@@ -147,17 +136,6 @@
#undef htonl
#undef htons

- * Do the prototypes. Somebody might want to take the
- * address or some such sick thing..
- */
-extern __u32 ntohl(__be32);
-extern __be32 htonl(__u32);
-extern __u16 ntohs(__be16);
-extern __be16 htons(__u16);
-#if defined(__GNUC__) && defined(__OPTIMIZE__)
#define ___htonl(x) __cpu_to_be32(x)
#define ___htons(x) __cpu_to_be16(x)
#define ___ntohl(x) __be32_to_cpu(x)
@@ -168,9 +146,6 @@ extern __be16 htons(__u16);
#define htons(x) ___htons(x)
#define ntohs(x) ___ntohs(x)

-#endif /* OPTIMIZE */
#endif /* KERNEL */


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