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____cacheline_aligned_in_smp attribute only makes sure to align a field to a cache line. It does not prevent the linker to use the remaining of the cache line for other variables, causing potential false sharing. Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://patch.msgid.link/20250630093540.3052835-5-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
22 lines
682 B
C
22 lines
682 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _NET_ALIGNED_DATA_H
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#define _NET_ALIGNED_DATA_H
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#include <linux/atomic.h>
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#include <linux/types.h>
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/* Structure holding cacheline aligned fields on SMP builds.
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* Each field or group should have an ____cacheline_aligned_in_smp
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* attribute to ensure no accidental false sharing can happen.
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*/
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struct net_aligned_data {
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atomic64_t net_cookie ____cacheline_aligned_in_smp;
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#if defined(CONFIG_INET)
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atomic_long_t tcp_memory_allocated ____cacheline_aligned_in_smp;
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atomic_long_t udp_memory_allocated ____cacheline_aligned_in_smp;
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#endif
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};
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extern struct net_aligned_data net_aligned_data;
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#endif /* _NET_ALIGNED_DATA_H */
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