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Re: [PATCH v6 01/11] block: Simplify QAPI_LIST_ADD
From: |
Markus Armbruster |
Subject: |
Re: [PATCH v6 01/11] block: Simplify QAPI_LIST_ADD |
Date: |
Tue, 27 Oct 2020 13:58:27 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) |
Eric Blake <eblake@redhat.com> writes:
> There is no need to rely on the verbosity of the gcc/clang compiler
> extension of g_new(typeof(X), 1) when we can instead use the standard
> g_malloc(sizeof(X)). In general, we like g_new over g_malloc for
> returning type X rather than void* to let the compiler catch more
> potential typing mistakes, but in this particular macro, our other use
> of typeof on the same line already ensures we are getting correct
> results.
>
> Suggested-by: Markus Armbruster <armbru@redhat.com>
> Signed-off-by: Eric Blake <eblake@redhat.com>
> ---
> block.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/block.c b/block.c
> index 430edf79bb10..857387f3912f 100644
> --- a/block.c
> +++ b/block.c
> @@ -5231,7 +5231,7 @@ BlockDeviceInfoList *bdrv_named_nodes_list(bool flat,
> }
>
> #define QAPI_LIST_ADD(list, element) do { \
> - typeof(list) _tmp = g_new(typeof(*(list)), 1); \
> + typeof(list) _tmp = g_malloc(sizeof(*(list))); \
> _tmp->value = (element); \
> _tmp->next = (list); \
> (list) = _tmp; \
Reviewed-by: Markus Armbruster <armbru@redhat.com>
- [PATCH v6 00/11] Exposing backing-chain allocation over NBD, Eric Blake, 2020/10/27
- [PATCH v6 01/11] block: Simplify QAPI_LIST_ADD, Eric Blake, 2020/10/27
- [PATCH v6 02/11] qapi: Make QAPI_LIST_ADD() public, Eric Blake, 2020/10/27
- [PATCH v6 04/11] nbd: Update qapi to support exporting multiple bitmaps, Eric Blake, 2020/10/27
- [PATCH v6 08/11] block: Return depth level during bdrv_is_allocated_above, Eric Blake, 2020/10/27
- [PATCH v6 07/11] nbd: Allow export of multiple bitmaps for one device, Eric Blake, 2020/10/27
- [PATCH v6 03/11] nbd: Utilize QAPI_CLONE for type conversion, Eric Blake, 2020/10/27
- [PATCH v6 09/11] nbd: Add new qemu:allocation-depth metadata context, Eric Blake, 2020/10/27