| Message ID | 20240822133908.1042240-7-lizetao1@huawei.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Some modifications to optimize code readability | expand |
On Thu, Aug 22, 2024 at 09:39:06PM +0800, Li Zetao wrote: > When coping sockaddr in ip6_mc_msfget(), the time of copies > depends on the minimum value between sl_count and gf_numsrc. > Using min() here is very semantic. > > Signed-off-by: Li Zetao <lizetao1@huawei.com> > --- > net/ipv6/mcast.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c > index 7ba01d8cfbae..b244dbf61d5f 100644 > --- a/net/ipv6/mcast.c > +++ b/net/ipv6/mcast.c > @@ -586,7 +586,8 @@ int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, > const struct in6_addr *group; > struct ipv6_mc_socklist *pmc; > struct ip6_sf_socklist *psl; > - int i, count, copycount; > + unsigned int count; > + int i, copycount; > > group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; > > @@ -610,7 +611,7 @@ int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, > psl = sock_dereference(pmc->sflist, sk); > count = psl ? psl->sl_count : 0; Both count and psl->sl_count are unsigned int, so this looks safe (and more correct than what it replaces, IMHO). > > - copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; > + copycount = min(count, gsf->gf_numsrc); And gsf->gf_numsrc is a __u32, so min operating on it and count looks safe to me. Further, the code it replaces seems to be a max() operation in both intent and function. Reviewed-by: Simon Horman <horms@kernel.org> > gsf->gf_numsrc = count; > for (i = 0; i < copycount; i++) { > struct sockaddr_in6 *psin6; > -- > 2.34.1 > >
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c index 7ba01d8cfbae..b244dbf61d5f 100644 --- a/net/ipv6/mcast.c +++ b/net/ipv6/mcast.c @@ -586,7 +586,8 @@ int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, const struct in6_addr *group; struct ipv6_mc_socklist *pmc; struct ip6_sf_socklist *psl; - int i, count, copycount; + unsigned int count; + int i, copycount; group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; @@ -610,7 +611,7 @@ int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, psl = sock_dereference(pmc->sflist, sk); count = psl ? psl->sl_count : 0; - copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; + copycount = min(count, gsf->gf_numsrc); gsf->gf_numsrc = count; for (i = 0; i < copycount; i++) { struct sockaddr_in6 *psin6;
When coping sockaddr in ip6_mc_msfget(), the time of copies depends on the minimum value between sl_count and gf_numsrc. Using min() here is very semantic. Signed-off-by: Li Zetao <lizetao1@huawei.com> --- net/ipv6/mcast.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)