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Miller" , Eric Dumazet 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 Message-Id: X-Mailer: git-send-email 2.37.3 In-Reply-To: References: MIME-Version: 1.0 X-Spam-Status: No, score=-4.8 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747617678183300812?= X-GMAIL-MSGID: =?utf-8?q?1747617678183300812?= 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 --- 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,