[PATCH 2/6] x86/xen: Mark pv stub assembler symbol visible

Andi Kleen
2017-12-22T00:27:53Z

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 892df375b615..f03445fbbe2f 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;
}
--
2.15.0