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SubjectRe: [PATCH 2/2] mm: Add kvmalloc_ab_c and kvzalloc_struct
On Wed, Feb 14, 2018 at 01:55:59PM -0600, Christopher Lameter wrote:
> On Wed, 14 Feb 2018, Matthew Wilcox wrote:
>
> > +#define kvzalloc_struct(p, member, n, gfp) \
> > + (typeof(p))kvzalloc_ab_c(n, \
> > + sizeof(*(p)->member) + __must_be_array((p)->member), \
> > + offsetof(typeof(*(p)), member), gfp)
> > +
>
> Uppercase like the similar KMEM_CACHE related macros in
> include/linux/slab.h?>

Do you think that would look better in the users? Compare:

@@ -1284,7 +1284,7 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
return -EOPNOTSUPP;
if (mem.nregions > max_mem_regions)
return -E2BIG;
- newmem = kvzalloc(size + mem.nregions * sizeof(*m->regions), GFP_KERNEL);
+ newmem = kvzalloc_struct(newmem, regions, mem.nregions, GFP_KERNEL);
if (!newmem)
return -ENOMEM;

@@ -1284,7 +1284,7 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
return -EOPNOTSUPP;
if (mem.nregions > max_mem_regions)
return -E2BIG;
- newmem = kvzalloc(size + mem.nregions * sizeof(*m->regions), GFP_KERNEL);
+ newmem = KVZALLOC_STRUCT(newmem, regions, mem.nregions, GFP_KERNEL);
if (!newmem)
return -ENOMEM;

Making it look like a function is more pleasing to my eye, but I'll
change it if that's the only thing keeping it from being merged.
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