Re: [Qemu-trivial] [PATCH] set_memory_options: remove code that make no sense

[Michael Tokarev <mjt@tls.msk.ru>]

03.11.2015 15:30, Cao jin wrote:
> Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
> ---
>  vl.c | 9 ---------
>  1 file changed, 9 deletions(-)
> 
> diff --git a/vl.c b/vl.c
> index f5f7c3f..13f2c8b 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -2860,11 +2860,6 @@ static void set_memory_options(uint64_t *ram_slots, ram_addr_t *maxram_size,
>      sz = 0;
>      mem_str = qemu_opt_get(opts, "size");
>      if (mem_str) {
> -        if (!*mem_str) {
> -            error_report("missing 'size' option value");
> -            exit(EXIT_FAILURE);
> -        }

I'm not sure this one is bad or good, it is indeed possible
to specify no value for size=, but if we're to check that,
we'd have to add such checks everywhere.

But the next one...

>          sz = qemu_opt_get_size(opts, "size", ram_size);
>  
>          /* Fix up legacy suffix-less format */
> @@ -2886,10 +2881,6 @@ static void set_memory_options(uint64_t *ram_slots, ram_addr_t *maxram_size,
>  
>      sz = QEMU_ALIGN_UP(sz, 8192);
>      ram_size = sz;
> -    if (ram_size != sz) {
> -        error_report("ram size too large");
> -        exit(EXIT_FAILURE);
> -    }

is definitely wrong.

sz is uint64_t, while ram_size is ram_addr_t which is
either uint64_t or uintptr_t.  Until it is fixed to
always be 64bits, the above code makes (some) sense.

Thanks,

/mjt