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Subject[PATCH v2 20/24] x86/xen: Make irq_enable() noinstr
vmlinux.o: warning: objtool: pv_ops[32]: native_irq_enable
vmlinux.o: warning: objtool: pv_ops[32]: __raw_callee_save_xen_irq_enable
vmlinux.o: warning: objtool: pv_ops[32]: xen_irq_enable_direct
vmlinux.o: warning: objtool: lock_is_held_type()+0xfe: call to pv_ops[32]() leaves .noinstr.text section

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/kernel/paravirt.c | 7 ++++-
arch/x86/xen/irq.c | 4 +--
arch/x86/xen/xen-asm.S | 56 ++++++++++++++++++++++-----------------------
3 files changed, 36 insertions(+), 31 deletions(-)

--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -258,6 +258,11 @@ static noinstr void pv_native_set_debugr
native_set_debugreg(regno, val);
}

+static noinstr void pv_native_irq_enable(void)
+{
+ native_irq_enable();
+}
+
struct paravirt_patch_template pv_ops = {
/* Cpu ops. */
.cpu.io_delay = native_io_delay,
@@ -302,7 +307,7 @@ struct paravirt_patch_template pv_ops =
/* Irq ops. */
.irq.save_fl = __PV_IS_CALLEE_SAVE(native_save_fl),
.irq.irq_disable = __PV_IS_CALLEE_SAVE(native_irq_disable),
- .irq.irq_enable = __PV_IS_CALLEE_SAVE(native_irq_enable),
+ .irq.irq_enable = __PV_IS_CALLEE_SAVE(pv_native_irq_enable),
.irq.safe_halt = native_safe_halt,
.irq.halt = native_halt,
#endif /* CONFIG_PARAVIRT_XXL */
--- a/arch/x86/xen/irq.c
+++ b/arch/x86/xen/irq.c
@@ -53,7 +53,7 @@ asmlinkage __visible void xen_irq_disabl
}
PV_CALLEE_SAVE_REGS_THUNK(xen_irq_disable);

-asmlinkage __visible void xen_irq_enable(void)
+asmlinkage __visible noinstr void xen_irq_enable(void)
{
struct vcpu_info *vcpu;

@@ -76,7 +76,7 @@ asmlinkage __visible void xen_irq_enable

preempt_enable();
}
-PV_CALLEE_SAVE_REGS_THUNK(xen_irq_enable);
+__PV_CALLEE_SAVE_REGS_THUNK(xen_irq_enable, ".noinstr.text");

static void xen_safe_halt(void)
{
--- a/arch/x86/xen/xen-asm.S
+++ b/arch/x86/xen/xen-asm.S
@@ -22,33 +22,6 @@
#include <linux/linkage.h>

/*
- * Enable events. This clears the event mask and tests the pending
- * event status with one and operation. If there are pending events,
- * then enter the hypervisor to get them handled.
- */
-SYM_FUNC_START(xen_irq_enable_direct)
- FRAME_BEGIN
- /* Unmask events */
- movb $0, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_mask
-
- /*
- * Preempt here doesn't matter because that will deal with any
- * pending interrupts. The pending check may end up being run
- * on the wrong CPU, but that doesn't hurt.
- */
-
- /* Test for pending */
- testb $0xff, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_pending
- jz 1f
-
- call check_events
-1:
- FRAME_END
- ret
-SYM_FUNC_END(xen_irq_enable_direct)
-
-
-/*
* Disabling events is simply a matter of making the event mask
* non-zero.
*/
@@ -57,6 +30,8 @@ SYM_FUNC_START(xen_irq_disable_direct)
ret
SYM_FUNC_END(xen_irq_disable_direct)

+.pushsection .noinstr.text, "ax"
+
/*
* Force an event check by making a hypercall, but preserve regs
* before making the call.
@@ -86,7 +61,32 @@ SYM_FUNC_START(check_events)
ret
SYM_FUNC_END(check_events)

-.pushsection .noinstr.text, "ax"
+/*
+ * Enable events. This clears the event mask and tests the pending
+ * event status with one and operation. If there are pending events,
+ * then enter the hypervisor to get them handled.
+ */
+SYM_FUNC_START(xen_irq_enable_direct)
+ FRAME_BEGIN
+ /* Unmask events */
+ movb $0, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_mask
+
+ /*
+ * Preempt here doesn't matter because that will deal with any
+ * pending interrupts. The pending check may end up being run
+ * on the wrong CPU, but that doesn't hurt.
+ */
+
+ /* Test for pending */
+ testb $0xff, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_pending
+ jz 1f
+
+ call check_events
+1:
+ FRAME_END
+ ret
+SYM_FUNC_END(xen_irq_enable_direct)
+
/*
* (xen_)save_fl is used to get the current interrupt enable status.
* Callers expect the status to be in X86_EFLAGS_IF, and other bits

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