Re: [Qemu-devel] [PATCH] linux-user: fix compile failure if !CONFIG_USE_GUEST_BASE

[Aurelien Jarno]

On Thu, Feb 10, 2011 at 04:53:04PM +0000, Peter Maydell wrote:
> If CONFIG_USE_GUEST_BASE is not defined, gcc complains:
>  linux-user/mmap.c:235: error: comparison of unsigned expression >= 0 is 
> always true
> 
> because RESERVED_VA is #defined to 0. Since mmap_find_vma_reserved()
> will never be called anyway if RESERVED_VA is always 0, fix this by
> simply #ifdef'ing away the function and its callsite.
> 
> Signed-off-by: Peter Maydell <address@hidden>
> ---
> I'm not a great fan of introducing #ifdefs, but I couldn't come
> up with a cleaner way of shutting gcc up...
> 
>  linux-user/mmap.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)

Thanks, applied.

> diff --git a/linux-user/mmap.c b/linux-user/mmap.c
> index abf21f6..0cf22f8 100644
> --- a/linux-user/mmap.c
> +++ b/linux-user/mmap.c
> @@ -216,6 +216,7 @@ static abi_ulong mmap_next_start = TASK_UNMAPPED_BASE;
>  
>  unsigned long last_brk;
>  
> +#ifdef CONFIG_USE_GUEST_BASE
>  /* Subroutine of mmap_find_vma, used when we have pre-allocated a chunk
>     of guest address space.  */
>  static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size)
> @@ -249,6 +250,7 @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, 
> abi_ulong size)
>      mmap_next_start = addr;
>      return last_addr;
>  }
> +#endif
>  
>  /*
>   * Find and reserve a free memory area of size 'size'. The search
> @@ -271,9 +273,11 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
>  
>      size = HOST_PAGE_ALIGN(size);
>  
> +#ifdef CONFIG_USE_GUEST_BASE
>      if (RESERVED_VA) {
>          return mmap_find_vma_reserved(start, size);
>      }
> +#endif
>  
>      addr = start;
>      wrapped = repeat = 0;
> -- 
> 1.7.1
> 
> 
> 

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
address@hidden                 http://www.aurel32.net