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Message-ID: <CANn89iKVc9J5511u2GO7Qpc=CShhhRf+qN5NmEv5bnHcUM6d1g@mail.gmail.com> Date: Thu, 26 Oct 2023 11:42:45 +0200 From: Eric Dumazet <edumazet@...gle.com> To: Coco Li <lixiaoyan@...gle.com> Cc: Jakub Kicinski <kuba@...nel.org>, Neal Cardwell <ncardwell@...gle.com>, Mubashir Adnan Qureshi <mubashirq@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>, Jonathan Corbet <corbet@....net>, David Ahern <dsahern@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org, Chao Wu <wwchao@...gle.com>, Wei Wang <weiwan@...gle.com>, Pradeep Nemavat <pnemavat@...gle.com> Subject: Re: [PATCH v4 net-next 2/6] cache: enforce cache groups On Thu, Oct 26, 2023 at 10:20 AM Coco Li <lixiaoyan@...gle.com> wrote: > > Set up build time warnings to safegaurd against future header changes of safeguard > organized structs. > > Signed-off-by: Coco Li <lixiaoyan@...gle.com> > Suggested-by: Daniel Borkmann <daniel@...earbox.net> > Acked-by: Daniel Borkmann <daniel@...earbox.net> Reviewed-by: Eric Dumazet <edumazet@...gle.com> > --- > include/linux/cache.h | 18 ++++++++++++++++++ > 1 file changed, 18 insertions(+) > > diff --git a/include/linux/cache.h b/include/linux/cache.h > index 9900d20b76c28..4e547beccd6a5 100644 > --- a/include/linux/cache.h > +++ b/include/linux/cache.h > @@ -85,6 +85,24 @@ > #define cache_line_size() L1_CACHE_BYTES > #endif > > +#ifndef __cacheline_group_begin > +#define __cacheline_group_begin(GROUP) \ > + __u8 __cacheline_group_begin__##GROUP[0] > +#endif > + > +#ifndef __cacheline_group_end > +#define __cacheline_group_end(GROUP) \ > + __u8 __cacheline_group_end__##GROUP[0] > +#endif > + > +#ifndef CACHELINE_ASSERT_GROUP_MEMBER > +#define CACHELINE_ASSERT_GROUP_MEMBER(TYPE, GROUP, MEMBER) \ > + BUILD_BUG_ON(!(offsetof(TYPE, MEMBER) >= \ > + offsetofend(TYPE, __cacheline_group_begin__##GROUP) && \ > + offsetofend(TYPE, MEMBER) <= \ > + offsetof(TYPE, __cacheline_group_end__##GROUP))) > +#endif > + > /* > * Helper to add padding within a struct to ensure data fall into separate > * cachelines. > -- > 2.42.0.758.gaed0368e0e-goog >
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