include/linux/compiler-gcc.h: hide assume_aligned attribute from sparse
authorRasmus Villemoes <linux@rasmusvillemoes.dk>
Fri, 6 Nov 2015 02:45:05 +0000 (18:45 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 6 Nov 2015 03:34:48 +0000 (19:34 -0800)
The patch "slab.h: sprinkle __assume_aligned attributes" causes *tons* of
whinges if you do 'make C=2' with sparse 0.5.0:

  CHECK   drivers/media/usb/pwc/pwc-if.c
include/linux/slab.h:307:43: error: attribute '__assume_aligned__': unknown attribute
include/linux/slab.h:308:58: error: attribute '__assume_aligned__': unknown attribute
include/linux/slab.h:337:73: error: attribute '__assume_aligned__': unknown attribute
include/linux/slab.h:375:74: error: attribute '__assume_aligned__': unknown attribute
include/linux/slab.h:378:80: error: attribute '__assume_aligned__': unknown attribute

sparse apparently pretends to be gcc >= 4.9, yet isn't prepared to handle
all the function attributes supported by those gccs and complains loudly.
So hide the definition of __assume_aligned from it (so that the generic
one in compiler.h gets used).

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reported-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Tested-By: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Cc: Christopher Li <sparse@chrisli.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/compiler-gcc.h

index 02fa6176120d80553e67cb7bacf4c332333e3c97..0e3110a0b771551191c58ec95e4c04fb1262c5d8 100644 (file)
 #endif
 
 
-#if GCC_VERSION >= 40900
+#if GCC_VERSION >= 40900 && !defined(__CHECKER__)
 /*
  * __assume_aligned(n, k): Tell the optimizer that the returned
  * pointer can be assumed to be k modulo n. The second argument is