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From: Andi Kleen <andi@firstfloor.org>
To: linux-kernel@vger.kernel.org
Cc: x86@kernel.org, samitolvanen@google.com, alxmtvv@gmail.com,
	linux-kbuild@vger.kernel.org, yamada.masahiro@socionext.com,
	akpm@linux-foundation.org, Andi Kleen <ak@linux.intel.com>
Subject: [PATCH 01/21] x86/xen: Mark pv stub assembler symbol visible
Date: Mon, 27 Nov 2017 13:34:03 -0800	[thread overview]
Message-ID: <20171127213423.27218-2-andi@firstfloor.org> (raw)
In-Reply-To: <20171127213423.27218-1-andi@firstfloor.org>

From: Andi Kleen <ak@linux.intel.com>

With LTO any external assembler symbol has to be marked __visible.
Mark the generated asm PV stubs __visible to prevent a linker error.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 arch/x86/include/asm/paravirt.h | 3 ++-
 drivers/xen/time.c              | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 283efcaac8af..cf2861aa4df0 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -745,7 +745,8 @@ static __always_inline bool pv_vcpu_is_preempted(long cpu)
  */
 #define PV_THUNK_NAME(func) "__raw_callee_save_" #func
 #define PV_CALLEE_SAVE_REGS_THUNK(func)					\
-	extern typeof(func) __raw_callee_save_##func;			\
+	extern __visible typeof(func) __raw_callee_save_##func;		\
+	extern __visible typeof(func) func;				\
 									\
 	asm(".pushsection .text;"					\
 	    ".globl " PV_THUNK_NAME(func) ";"				\
diff --git a/drivers/xen/time.c b/drivers/xen/time.c
index 3e741cd1409c..708a00c337d7 100644
--- a/drivers/xen/time.c
+++ b/drivers/xen/time.c
@@ -144,7 +144,7 @@ void xen_get_runstate_snapshot(struct vcpu_runstate_info *res)
 }
 
 /* return true when a vcpu could run but has no real cpu to run on */
-bool xen_vcpu_stolen(int vcpu)
+__visible bool xen_vcpu_stolen(int vcpu)
 {
 	return per_cpu(xen_runstate, vcpu).state == RUNSTATE_runnable;
 }
-- 
2.13.6

  reply	other threads:[~2017-11-27 21:40 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-27 21:34 Link time optimization for LTO/x86 Andi Kleen
2017-11-27 21:34 ` Andi Kleen [this message]
2017-11-27 21:34 ` [PATCH 02/21] afs: Fix const confusion in AFS Andi Kleen
2017-11-27 21:34 ` [PATCH 03/21] x86/timer: Don't inline __const_udelay Andi Kleen
2017-11-27 21:34 ` [PATCH 04/21] locking/spinlocks: Mark spinlocks noinline when inline spinlocks are disabled Andi Kleen
2017-11-27 21:34 ` [PATCH 05/21] x86/kvm: Make steal_time visible Andi Kleen
2017-11-27 21:34 ` [PATCH 06/21] x86/syscalls: Make x86 syscalls use real prototypes Andi Kleen
2017-11-27 21:34 ` [PATCH 07/21] x86: Make exception handler functions visible Andi Kleen
2017-11-27 21:34 ` [PATCH 08/21] x86/idt: Make const __initconst Andi Kleen
2017-11-27 21:34 ` [PATCH 09/21] lto: Use C version for SYSCALL_ALIAS Andi Kleen
2017-11-27 21:34 ` [PATCH 10/21] Fix read buffer overflow in delta-ipc Andi Kleen
2017-11-27 21:34 ` [PATCH 11/21] trace: Use -mcount-record for dynamic ftrace Andi Kleen
2017-12-01  0:22   ` Steven Rostedt
2018-05-01 18:42     ` Steven Rostedt
2017-11-27 21:34 ` [PATCH 12/21] ftrace: Mark function tracer test functions noinline/noclone Andi Kleen
2017-11-27 21:34 ` [PATCH 13/21] ftrace: Disable LTO for ftrace self tests Andi Kleen
2017-11-27 21:34 ` [PATCH 14/21] lto, fs: Avoid static variable in linux/fs.h Andi Kleen
2017-11-27 21:34 ` [PATCH 15/21] lto, x86, mm: Disable vmalloc BUILD_BUG_ON for LTO Andi Kleen
2017-11-27 21:34 ` [PATCH 16/21] lto: Add __noreorder and mark initcalls __noreorder Andi Kleen
2017-11-27 21:34 ` [PATCH 17/21] lto, workaround: Disable LTO for BPF Andi Kleen
2017-11-27 21:34 ` [PATCH 18/21] lto, crypto: Disable LTO for camelia glue Andi Kleen
2017-11-27 21:34 ` [PATCH 19/21] lto, x86: Disable LTO for realmode / vDSO / head64 Andi Kleen
2017-11-27 21:34 ` [PATCH 20/21] Kbuild, lto: Add Link Time Optimization support Andi Kleen
2018-01-27  0:15   ` Arnd Bergmann
2018-01-27  0:55     ` Andi Kleen
2018-01-27 14:26       ` Arnd Bergmann
2018-01-28 18:33         ` Andi Kleen
2017-11-27 21:34 ` [PATCH 21/21] x86: Enable Link Time Optimization Andi Kleen
2017-11-28 16:04 ` [PATCH 02/21] afs: Fix const confusion in AFS David Howells
2017-11-28 16:50   ` Andi Kleen
2017-11-29 23:09 ` Link time optimization for LTO/x86 Sami Tolvanen

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