Re: [PATCH 2/3] 9pfs: Use g_new() & friends where that makes obvious sense

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

Hi Christian,

On 14/3/22 17:42, Christian Schoenebeck wrote:
> On Montag, 14. März 2022 17:01:07 CET 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 commit only touches allocations with size arguments of the form
> > sizeof(T).
> >
> > Patch created mechanically with:
> >
> >      $ spatch --in-place --sp-file scripts/coccinelle/use-g_new-etc.cocci \
> >              --macro-file scripts/cocci-macro-file.h FILES...
> >
> > Except this uncovers a typing error:
> >
> >      ../hw/9pfs/9p.c:855:13: warning: incompatible pointer types assigning to
> > 'QpfEntry *' from 'QppEntry *' [-Wincompatible-pointer-types] val =
> > g_new0(QppEntry, 1);
> >                 ^ ~~~~~~~~~~~~~~~~~~~
> >      1 warning generated.
> >
> > Harmless, because QppEntry is larger than QpfEntry.  Fix to allocate a
> > QpfEntry instead.
> >
> > Cc: Greg Kurz <groug@xxxxxxxx>
> > Cc: Christian Schoenebeck <qemu_oss@xxxxxxxxxxxxx>
> > Signed-off-by: Markus Armbruster <armbru@xxxxxxxxxx>
> > ---
> Reviewed-by: Christian Schoenebeck <qemu_oss@xxxxxxxxxxxxx>
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