Re: #define MADV_NORMAL different in kernel and glibc

[Andreas Jaeger]

[e-mail] writes:

> Not a bug, just an inconsistency:
> 
> #defines for MADV_* are different between glibc-2.2.4 and recent linux kernels.
> 
> Most src/linux/include/asm*/mman.h define MADV_* in hex.  
> asm-alpha and asm-parisc in Linus and Alan trees use decimal.
> 
> /usr/include/bits comes from glibc.
> 
> hrandoz@rushmore:/$ grep " MADV_" /usr/include/bits/mman.h
> # define MADV_NORMAL     0      /* No further special treatment.  */
> # define MADV_RANDOM     1      /* Expect random page references.  */
> # define MADV_SEQUENTIAL 2      /* Expect sequential page references.  */
> # define MADV_WILLNEED   3      /* Will need these pages.  */
> # define MADV_DONTNEED   4      /* Don't need these pages.  */
> 
> /usr/include/asm comes from src/linux/include/asm.
> 
> hrandoz@rushmore:/$ grep " MADV_" /usr/include/asm/mman.h
> #define MADV_NORMAL     0x0             /* default page-in behavior */
> #define MADV_RANDOM     0x1             /* page-in minimum required */
> #define MADV_SEQUENTIAL 0x2             /* read-ahead aggressively */
> #define MADV_WILLNEED   0x3             /* pre-fault pages */
> #define MADV_DONTNEED   0x4             /* discard these pages */
> 
> 
> Programs like mremap04.c from the Linux Test Project that include mman.h
> give a warning like:

Those programs should not include asm/mman.h.  Just remove the
inclusion of that header and use only glibc's headers.

Andreas
-- 
 Andreas Jaeger
  SuSE Labs [e-mail]
   private [e-mail]
    http://www.suse.de/~aj