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bh=KNEh+ZS43l4fs1ygurS2HLPWAbO1/zVyUp6TyI3WOfY=; b=VB+NAyF95ShyXaialLQseb6IzKBmVldY6odcWjVK3ZnTnhKAPHoLi9xqgEPS+xqyw68UCj j1Q9pu/c2FaHniBA== From: "tip-bot2 for James Morse" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/cache] tick/nohz: Move tick_nohz_full_mask declaration outside the #ifdef Cc: James Morse , "Borislav Petkov (AMD)" , Shaopeng Tan , Thomas Gleixner , Reinette Chatre , Peter Newman , Carl Worth , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20240213184438.16675-2-james.morse@arm.com> References: <20240213184438.16675-2-james.morse@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <170836786117.398.9035726276646423995.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790811786704839901 X-GMAIL-MSGID: 1791353864110554571 The following commit has been merged into the x86/cache branch of tip: Commit-ID: 31a5c0b7c674977889ce721d69101bc35f25e041 Gitweb: https://git.kernel.org/tip/31a5c0b7c674977889ce721d69101bc35f25e041 Author: James Morse AuthorDate: Tue, 13 Feb 2024 18:44:15 Committer: Borislav Petkov (AMD) CommitterDate: Fri, 16 Feb 2024 19:18:31 +01:00 tick/nohz: Move tick_nohz_full_mask declaration outside the #ifdef tick_nohz_full_mask lists the CPUs that are nohz_full. This is only needed when CONFIG_NO_HZ_FULL is defined. tick_nohz_full_cpu() allows a specific CPU to be tested against the mask, and evaluates to false when CONFIG_NO_HZ_FULL is not defined. The resctrl code needs to pick a CPU to run some work on, a new helper prefers housekeeping CPUs by examining the tick_nohz_full_mask. Hiding the declaration behind #ifdef CONFIG_NO_HZ_FULL forces all the users to be behind an #ifdef too. Move the tick_nohz_full_mask declaration, this lets callers drop the #ifdef, and guard access to tick_nohz_full_mask with IS_ENABLED() or something like tick_nohz_full_cpu(). The definition does not need to be moved as any callers should be removed at compile time unless CONFIG_NO_HZ_FULL is defined. Signed-off-by: James Morse Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Shaopeng Tan Reviewed-by: Thomas Gleixner Acked-by: Reinette Chatre # for resctrl dependency Tested-by: Shaopeng Tan Tested-by: Peter Newman Tested-by: Carl Worth # arm64 Link: https://lore.kernel.org/r/20240213184438.16675-2-james.morse@arm.com Signed-off-by: Borislav Petkov (AMD) --- include/linux/tick.h | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/include/linux/tick.h b/include/linux/tick.h index 716d17f..0fb9038 100644 --- a/include/linux/tick.h +++ b/include/linux/tick.h @@ -164,9 +164,16 @@ static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; } static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; } #endif /* !CONFIG_NO_HZ_COMMON */ +/* + * Mask of CPUs that are nohz_full. + * + * Users should be guarded by CONFIG_NO_HZ_FULL or a tick_nohz_full_cpu() + * check. + */ +extern cpumask_var_t tick_nohz_full_mask; + #ifdef CONFIG_NO_HZ_FULL extern bool tick_nohz_full_running; -extern cpumask_var_t tick_nohz_full_mask; static inline bool tick_nohz_full_enabled(void) {