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Re: [PATCH v2 2/2] mmap-alloc: Include osdep.h before checking CONFIG_LI
From: |
Michael S. Tsirkin |
Subject: |
Re: [PATCH v2 2/2] mmap-alloc: Include osdep.h before checking CONFIG_LINUX |
Date: |
Thu, 12 Mar 2020 02:30:08 -0400 |
On Wed, Mar 11, 2020 at 07:23:42PM -0400, Eduardo Habkost wrote:
> The CONFIG_LINUX check at the top of mmap-alloc.c never worked
> because it was done before including osdep.h.
>
> This means MAP_SYNC and MAP_SHARED_VALIDATE would always be set
> to 0 at the beginning of the file. Luckily, this didn't break
> when using recent glibc versions (2.28+), because those macros
> were redefined by glibc headers.
>
> Move the CONFIG_LINUX check after the main include lines, so the
> CONFIG_LINUX check works and we actually include <linux/mman.h>.
> This will make MAP_SYNC and MAP_SHARED_VALIDATE available even if
> the host has an older glibc version.
>
> Reported-by: Jingqi Liu <address@hidden>
> Reviewed-by: Michael S. Tsirkin <address@hidden>
> Signed-off-by: Eduardo Habkost <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Cc: address@hidden
> ---
> Changes v1 -> v2:
> * (none)
> ---
> util/mmap-alloc.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c
> index 27dcccd8ec..7c2ce98eb0 100644
> --- a/util/mmap-alloc.c
> +++ b/util/mmap-alloc.c
> @@ -9,6 +9,9 @@
> * This work is licensed under the terms of the GNU GPL, version 2 or
> * later. See the COPYING file in the top-level directory.
> */
> +#include "qemu/osdep.h"
> +#include "qemu/mmap-alloc.h"
> +#include "qemu/host-utils.h"
>
> #ifdef CONFIG_LINUX
> #include <linux/mman.h>
> @@ -17,10 +20,6 @@
> #define MAP_SHARED_VALIDATE 0x0
> #endif /* CONFIG_LINUX */
>
> -#include "qemu/osdep.h"
> -#include "qemu/mmap-alloc.h"
> -#include "qemu/host-utils.h"
> -
> #define HUGETLBFS_MAGIC 0x958458f6
>
> #ifdef CONFIG_LINUX
> --
> 2.24.1
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