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Message-ID: <e1461cf9-be4a-6c3b-5209-91339262491c@gmail.com> Date: Mon, 8 Aug 2016 21:04:09 +0800 From: hejianet <hejianet@...il.com> To: Florian Westphal <fw@...len.de> Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, Alexey Kuznetsov <kuznet@....inr.ac.ru>, James Morris <jmorris@...ei.org>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, Patrick McHardy <kaber@...sh.net> Subject: Re: [RFC PATCH 1/3] net: Remove unnecessary memset in __snmp6_fill_stats64 Yes, sorry about it,I am too hasty B.R. Jia He On 8/8/16 7:12 PM, Florian Westphal wrote: > Jia He <hejianet@...il.com> wrote: >> buff[] will be assigned later, so memset is not necessary. >> >> Signed-off-by: Jia He <hejianet@...il.com> >> Cc: "David S. Miller" <davem@...emloft.net> >> Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru> >> Cc: James Morris <jmorris@...ei.org> >> Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org> >> Cc: Patrick McHardy <kaber@...sh.net> >> --- >> net/ipv6/addrconf.c | 1 - >> 1 file changed, 1 deletion(-) >> >> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c >> index ab3e796..43fa8d0 100644 >> --- a/net/ipv6/addrconf.c >> +++ b/net/ipv6/addrconf.c >> @@ -4967,7 +4967,6 @@ static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, >> >> BUG_ON(pad < 0); >> >> - memset(buff, 0, sizeof(buff)); >> buff[0] = IPSTATS_MIB_MAX; >> >> for_each_possible_cpu(c) { > for (i = 1; i < IPSTATS_MIB_MAX; i++) > buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); > > Without memset result of buff[i] += ... is undefined. >
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