Re: [git-pull -tip] x86: cleanup patches 20090322

[Hannes Eder]

On Mon, Mar 23, 2009 at 10:45 AM, Jaswinder Singh Rajput
<jaswinder@xxxxxxxxxx> wrote:
> On Mon, 2009-03-23 at 18:45 +1030, Rusty Russell wrote:
>> On Monday 23 March 2009 07:22:56 Jaswinder Singh Rajput wrote:
>> >       x86: e820.h fix various signedness issues in setup.c and e820.c
>>
>> Wouldn't fixing the users be better than changing the header?  Esp. since
>> it could well now cause similar warnings in userspace programs.
>>
>> >  struct e820map {
>> > -   __u32 nr_map;
>> > +   __s32 nr_map;
>> >     struct e820entry map[E820_X_MAX];
>> >  };
>>
>> This number can't be negative!
>>
>
> Is this OK, or should I go more further:

since sanitize_e820_map does only modify its third argument on
success, and leaves it untouched on error, the temporary variable
could be eliminated in some places.

> From: Jaswinder Singh Rajput <jaswinderrajput@xxxxxxxxx>
> Date: Mon, 23 Mar 2009 02:13:01 +0530
> Subject: [PATCH] x86: e820 fix various signedness issues in setup.c and e820.c
>
> Impact: cleanup
>
> This fixed various signedness issues in setup.c and e820.c:
> arch/x86/kernel/setup.c:455:53: warning: incorrect type in argument 3 (different signedness)
> arch/x86/kernel/setup.c:455:53:    expected int *pnr_map
> arch/x86/kernel/setup.c:455:53:    got unsigned int extern [toplevel] *<noident>
> arch/x86/kernel/setup.c:639:53: warning: incorrect type in argument 3 (different signedness)
> arch/x86/kernel/setup.c:639:53:    expected int *pnr_map
> arch/x86/kernel/setup.c:639:53:    got unsigned int extern [toplevel] *<noident>
> arch/x86/kernel/setup.c:820:54: warning: incorrect type in argument 3 (different signedness)
> arch/x86/kernel/setup.c:820:54:    expected int *pnr_map
> arch/x86/kernel/setup.c:820:54:    got unsigned int extern [toplevel] *<noident>
>
> arch/x86/kernel/e820.c:670:53: warning: incorrect type in argument 3 (different signedness)
> arch/x86/kernel/e820.c:670:53:    expected int *pnr_map
> arch/x86/kernel/e820.c:670:53:    got unsigned int [toplevel] *<noident>
>
> Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@xxxxxxxxx>
> ---
>  arch/x86/include/asm/e820.h |    2 +-
>  arch/x86/kernel/e820.c      |   10 +++++-----
>  2 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h
> index 00d41ce..7ecba4d 100644
> --- a/arch/x86/include/asm/e820.h
> +++ b/arch/x86/include/asm/e820.h
> @@ -72,7 +72,7 @@ extern int e820_all_mapped(u64 start, u64 end, unsigned type);
>  extern void e820_add_region(u64 start, u64 size, int type);
>  extern void e820_print_map(char *who);
>  extern int
> -sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, int *pnr_map);
> +sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map);
>  extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
>                               unsigned new_type);
>  extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
> diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
> index fb638d9..ef2c356 100644
> --- a/arch/x86/kernel/e820.c
> +++ b/arch/x86/kernel/e820.c
> @@ -233,7 +233,7 @@ void __init e820_print_map(char *who)
>  */
>
>  int __init sanitize_e820_map(struct e820entry *biosmap, int max_nr_map,
> -                               int *pnr_map)
> +                            u32 *pnr_map)
>  {
>        struct change_member {
>                struct e820entry *pbios; /* pointer to original bios entry */
> @@ -552,7 +552,7 @@ u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type,
>
>  void __init update_e820(void)
>  {
> -       int nr_map;
> +       u32 nr_map;
>
>        nr_map = e820.nr_map;
>        if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr_map))
> @@ -563,7 +563,7 @@ void __init update_e820(void)
>  }
>  static void __init update_e820_saved(void)
>  {
> -       int nr_map;
> +       u32 nr_map;
>
>        nr_map = e820_saved.nr_map;
>        if (sanitize_e820_map(e820_saved.map, ARRAY_SIZE(e820_saved.map), &nr_map))
> @@ -1303,7 +1303,7 @@ early_param("memmap", parse_memmap_opt);
>  void __init finish_e820_parsing(void)
>  {
>        if (userdef) {
> -               int nr = e820.nr_map;
> +               u32 nr = e820.nr_map;
>
>                if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr) < 0)
>                        early_panic("Invalid user supplied memory map");
> @@ -1386,7 +1386,7 @@ void __init e820_reserve_resources_late(void)
>  char *__init default_machine_specific_memory_setup(void)
>  {
>        char *who = "BIOS-e820";
> -       int new_nr;
> +       u32 new_nr;
>        /*
>         * Try to copy the BIOS-supplied E820-map.
>         *
> --
> 1.6.0.6
>
>
>
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