From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
To: scott.d.constable@intel.com, daniel.sneddon@linux.intel.com,
Jakub Kicinski <kuba@kernel.org>,
dave.hansen@intel.com, Johannes Berg <johannes@sipsolutions.net>,
Paolo Abeni <pabeni@redhat.com>,
antonio.gomez.iglesias@linux.intel.com,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>
Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
x86@kernel.org, gregkh@linuxfoundation.org,
netdev@vger.kernel.org
Subject: [RFC PATCH 1/2] nospec: Add a generic barrier_nospec()
Date: Mon, 24 Oct 2022 15:57:46 -0700 [thread overview]
Message-ID: <a29745ae921ed03084b7d4bdec38c7b01d764fb9.1666651511.git.pawan.kumar.gupta@linux.intel.com> (raw)
In-Reply-To: <cover.1666651511.git.pawan.kumar.gupta@linux.intel.com>
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@linux.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
next prev parent reply other threads:[~2022-10-25 0:33 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-24 22:57 [RFC PATCH 0/2] Branch Target Injection (BTI) gadget in minstrel Pawan Gupta
2022-10-24 22:57 ` Pawan Gupta [this message]
2022-10-24 22:57 ` [RFC PATCH 2/2] minstrel_ht: Mitigate BTI gadget minstrel_ht_get_expected_throughput() Pawan Gupta
2022-10-25 7:36 ` Greg KH
2022-10-25 16:55 ` Pawan Gupta
2022-10-25 11:07 ` [RFC PATCH 0/2] Branch Target Injection (BTI) gadget in minstrel Peter Zijlstra
2022-10-25 19:38 ` Pawan Gupta
2022-10-25 19:56 ` Johannes Berg
2022-10-26 0:17 ` Pawan Gupta
2022-10-25 20:31 ` Peter Zijlstra
2022-10-25 22:00 ` Dave Hansen
2022-10-26 7:31 ` Peter Zijlstra
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