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From: "tip-bot2 for Peter Zijlstra" <tip-bot2@linutronix.de>
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Reply-to: linux-kernel@vger.kernel.org
To: linux-tip-commits@vger.kernel.org
Subject: [tip: sched/core] cpuidle, nospec: Make mds_idle_clear_cpu_buffers()
noinstr clean
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Tony Lindgren <tony@atomide.com>,
Ulf Hansson <ulf.hansson@linaro.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Frederic Weisbecker <frederic@kernel.org>, x86@kernel.org,
linux-kernel@vger.kernel.org
In-Reply-To: <20230112195541.233779815@infradead.org>
References: <20230112195541.233779815@infradead.org>
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[tip:,sched/core] cpuidle, nospec: Make mds_idle_clear_cpu_buffers() noinstr clean
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Commit Message
tip-bot2 for Thomas Gleixner
Jan. 13, 2023, 12:31 p.m. UTC
The following commit has been merged into the sched/core branch of tip: Commit-ID: 10fdb38cee36b8dc4775e6fe4ad85e78bafdbd65 Gitweb: https://git.kernel.org/tip/10fdb38cee36b8dc4775e6fe4ad85e78bafdbd65 Author: Peter Zijlstra <peterz@infradead.org> AuthorDate: Thu, 12 Jan 2023 20:43:45 +01:00 Committer: Ingo Molnar <mingo@kernel.org> CommitterDate: Fri, 13 Jan 2023 11:48:16 +01:00 cpuidle, nospec: Make mds_idle_clear_cpu_buffers() noinstr clean objtool found that the mds_idle_clear_cpu_buffers() method got uninlined by the compiler where it called out into instrumentation: vmlinux.o: warning: objtool: mwait_idle+0x47: call to mds_idle_clear_cpu_buffers() leaves .noinstr.text section vmlinux.o: warning: objtool: acpi_processor_ffh_cstate_enter+0xa2: call to mds_idle_clear_cpu_buffers() leaves .noinstr.text section vmlinux.o: warning: objtool: intel_idle+0x91: call to mds_idle_clear_cpu_buffers() leaves .noinstr.text section vmlinux.o: warning: objtool: intel_idle_s2idle+0x8c: call to mds_idle_clear_cpu_buffers() leaves .noinstr.text section vmlinux.o: warning: objtool: intel_idle_irq+0xaa: call to mds_idle_clear_cpu_buffers() leaves .noinstr.text section Solve this by marking mds_idle_clear_cpu_buffers() as __always_inline. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Tested-by: Tony Lindgren <tony@atomide.com> Tested-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Frederic Weisbecker <frederic@kernel.org> Link: https://lore.kernel.org/r/20230112195541.233779815@infradead.org --- arch/x86/include/asm/nospec-branch.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h index 771b0a2..e04313e 100644 --- a/arch/x86/include/asm/nospec-branch.h +++ b/arch/x86/include/asm/nospec-branch.h @@ -564,7 +564,7 @@ static __always_inline void mds_user_clear_cpu_buffers(void) * * Clear CPU buffers if the corresponding static key is enabled */ -static inline void mds_idle_clear_cpu_buffers(void) +static __always_inline void mds_idle_clear_cpu_buffers(void) { if (static_branch_likely(&mds_idle_clear)) mds_clear_cpu_buffers();