Patch "x86/platform/uv/BAU: Add APIC idt entry" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

x86/platform/uv/BAU: Add APIC idt entry

to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
x86-platform-uv-bau-add-apic-idt-entry.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Andrew Banman <[email protected]>
Date: Tue, 27 Mar 2018 17:09:06 -0500
Subject: x86/platform/uv/BAU: Add APIC idt entry

From: Andrew Banman <[email protected]>

commit 151ad17fbe5e56afa59709f41980508672c777ce upstream.

BAU uses the old alloc_initr_gate90 method to setup its interrupt. This fails silently as the BAU vector is in the range of APIC vectors that are registered to the spurious interrupt handler. As a consequence BAU broadcasts are not handled, and the broadcast source CPU hangs.

Update BAU to use new idt structure.

---
 arch/x86/include/asm/hw_irq.h |    1 +
 arch/x86/kernel/idt.c         |    3 +++
 arch/x86/platform/uv/tlb_uv.c |    2 --
 3 files changed, 4 insertions(+), 2 deletions(-)

@@ -36,6 +36,7 @@ extern asmlinkage void kvm_posted_intr_w
 extern asmlinkage void kvm_posted_intr_nested_ipi(void);
 extern asmlinkage void error_interrupt(void);
 extern asmlinkage void irq_work_interrupt(void);
+extern asmlinkage void uv_bau_message_intr1(void);
 
 extern asmlinkage void spurious_interrupt(void);
 extern asmlinkage void thermal_interrupt(void);

@@ -140,6 +140,9 @@ static const __initconst struct idt_data
 # ifdef CONFIG_IRQ_WORK
 	INTG(IRQ_WORK_VECTOR,		irq_work_interrupt),
 # endif
+#ifdef CONFIG_X86_UV
+	INTG(UV_BAU_MESSAGE,		uv_bau_message_intr1),
+#endif
 	INTG(SPURIOUS_APIC_VECTOR,	spurious_interrupt),
 	INTG(ERROR_APIC_VECTOR,		error_interrupt),
 #endif

@@ -2254,8 +2254,6 @@ static int __init uv_bau_init(void)
 			init_uvhub(uvhub, vector, uv_base_pnode);
 	}
 
-	alloc_intr_gate(vector, uv_bau_message_intr1);
-
 	for_each_possible_blade(uvhub) {
 		if (uv_blade_nr_possible_cpus(uvhub)) {
 			unsigned long val;

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/x86-platform-uv-bau-add-apic-idt-entry.patch