Re: [PATCH 0/3] Use g_new() & friends where that makes obvious

[Philippe Mathieu-Daudé <philippe.mathieu.daude@xxxxxxxxx>]

On 14/3/22 17:01, Markus Armbruster wrote:
> g_new(T, n) is neater than g_malloc(sizeof(T) * n).  It's also safer,
> for two reasons.  One, it catches multiplication overflowing size_t.
> Two, it returns T * rather than void *, which lets the compiler catch
> more type errors.
>
> This series only touches allocations with size arguments of the form
> sizeof(T).  It's mechanical, except for a tiny fix in PATCH 2.
>
> PATCH 1 adds the Coccinelle script.
>
> PATCH 2 cleans up the virtio-9p subsystem, and fixes a harmless typing
> error uncovered by the cleanup.
>
> PATCH 3 cleans up everything else.  I started to split it up, but
> splitting is a lot of decisions, and I just can't see the value.
>
> For instance, MAINTAINERS tells me to split for subsystem "virtio",
> patching
>
>      hw/char/virtio-serial-bus.c
>      hw/display/virtio-gpu.c
>      hw/net/virtio-net.c
>      hw/virtio/virtio-crypto.c
>      hw/virtio/virtio-iommu.c
>      hw/virtio/virtio.c
>
> But it also tells me to split for subsystem "Character devices",
> patching
>
>      hw/char/parallel.c                       |  2 +-
>      hw/char/riscv_htif.c                     |  2 +-
>      hw/char/virtio-serial-bus.c              |  6 +-
>
> and for subsystem "Network devices", patching
>
>      hw/net/virtio-net.c
>
> and for subsystem "virtio-gpu", patching
>
>      hw/display/virtio-gpu.c
>
> I guess I'd go with "virtio".  Six files down, 103 to go.  Thanks, but
> no thanks.
>
> Since the transformation is local to a function call, dropping is
> completely safe.  We can deal with conflicts by dropping conflicting
> hunks, with "git-pull -s recursive -X ours".  Or drop entire files
> with conflicts.
>
> If you want me to split off certain parts, please tell me exactly what
> you want split off, and I'll gladly do the splitting.  I don't mind
> the splitting part, I do mind the *thinking* part.
>
> Markus Armbruster (3):
>    scripts/coccinelle: New use-g_new-etc.cocci
>    9pfs: Use g_new() & friends where that makes obvious sense
>    Use g_new() & friends where that makes obvious sense
Series:
Reviewed-by: Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>