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compiler: add a sizeof_field() macro

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Determining the size of a field is useful when you don't have a struct
variable handy.  Open-coding this is ugly.

This patch adds the sizeof_field() macro, which is similar to
typeof_field().  Existing instances are updated to use the macro.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20180614164431.29305-1-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2018-06-14 17:44:31 +01:00
parent 00928a421d
commit f18793b096
9 changed files with 24 additions and 22 deletions
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4
hw/display/xenfb.c
View file

@ -525,8 +525,8 @@ static int xenfb_configure_fb(struct XenFB *xenfb, size_t fb_len_lim,
int width, int height, int depth,
size_t fb_len, int offset, int row_stride)
{
size_t mfn_sz = sizeof(*((struct xenfb_page *)0)->pd);
size_t pd_len = sizeof(((struct xenfb_page *)0)->pd) / mfn_sz;
size_t mfn_sz = sizeof_field(struct xenfb_page, pd[0]);
size_t pd_len = sizeof_field(struct xenfb_page, pd) / mfn_sz;
size_t fb_pages = pd_len * XC_PAGE_SIZE / mfn_sz;
size_t fb_len_max = fb_pages * XC_PAGE_SIZE;
int max_width, max_height;