[patch 1/7] Make __always_inline actually force always inlining

From: Ingo Molnar <[email protected]>

This patch is the first in a series that tries to optimize the kernel in terms of size
(and thus cache behavior, both cpu and pagecache).

This first patch changes __always_inline to be a forced inline instead of
the "regular" inline it was on everything except alpha. This forced inline
matches the intention of the define better as a matter of documentation.
There is no change in behavior by this patch, since "inline" currently is
mapped to a forced inline anyway.

Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Arjan van de Ven <[email protected]>

===================================================================
--- linux-2.6.15.orig/include/linux/compiler-gcc3.h
+++ linux-2.6.15/include/linux/compiler-gcc3.h
@@ -9,6 +9,8 @@
 # define __inline	__inline	__attribute__((always_inline))
 #endif
 
+#define __always_inline		inline __attribute__((always_inline))
+
 #if __GNUC_MINOR__ > 0
 # define __deprecated		__attribute__((deprecated))
 #endif
Index: linux-2.6.15/include/linux/compiler-gcc4.h
===================================================================
--- linux-2.6.15.orig/include/linux/compiler-gcc4.h
+++ linux-2.6.15/include/linux/compiler-gcc4.h
@@ -6,6 +6,7 @@
 #define inline			inline		__attribute__((always_inline))
 #define __inline__		__inline__	__attribute__((always_inline))
 #define __inline		__inline	__attribute__((always_inline))
+#define __always_inline		inline __attribute__((always_inline))
 #define __deprecated		__attribute__((deprecated))
 #define __attribute_used__	__attribute__((__used__))
 #define __attribute_pure__	__attribute__((pure))


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---

• Follow-Ups:
  • [patch 3/7] mark several functions __always_inline
    • From: Arjan van de Ven <[email protected]>
  • [patch 6/7] Unlinline a bunch of other functions
    • From: Arjan van de Ven <[email protected]>
  • [patch 7/7] Make "inline" no longer mandatory for gcc 4.x
    • From: Arjan van de Ven <[email protected]>
  • [patch 4/7] Mark some key VFS functions as __always_inline
    • From: Arjan van de Ven <[email protected]>
  • [patch 5/7] uninline capable()
    • From: Arjan van de Ven <[email protected]>
  • [patch 2/7] enable unit-at-a-time optimisations for gcc4
    • From: Arjan van de Ven <[email protected]>

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