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Date: Mon, 24 Oct 2022 15:57:46 -0700 From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com> To: scott.d.constable@...el.com, daniel.sneddon@...ux.intel.com, Jakub Kicinski <kuba@...nel.org>, dave.hansen@...el.com, Johannes Berg <johannes@...solutions.net>, Paolo Abeni <pabeni@...hat.com>, antonio.gomez.iglesias@...ux.intel.com, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com> Cc: linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org, gregkh@...uxfoundation.org, netdev@...r.kernel.org Subject: [RFC PATCH 1/2] nospec: Add a generic barrier_nospec() barrier_nospec() is a speculation barrier with an arch dependent implementation. Architectures that don't need a speculation barrier shouldn't have to define an arch specific version. To be able to use barrier_nospec() in non-architecture code add a generic version that does nothing. Architectures needing speculation barrier can override the generic version in their asm/barrier.h. Signed-off-by: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com> --- include/linux/nospec.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/nospec.h b/include/linux/nospec.h index c1e79f72cd89..60e040a5df27 100644 --- a/include/linux/nospec.h +++ b/include/linux/nospec.h @@ -60,6 +60,10 @@ static inline unsigned long array_index_mask_nospec(unsigned long index, (typeof(_i)) (_i & _mask); \ }) +#ifndef barrier_nospec +#define barrier_nospec() do { } while (0) +#endif + /* Speculation control prctl */ int arch_prctl_spec_ctrl_get(struct task_struct *task, unsigned long which); int arch_prctl_spec_ctrl_set(struct task_struct *task, unsigned long which, -- 2.37.3
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