linux-kernel - [tip: x86/apic] x86/msi: Fix compile error caused by CONFIG_GENERIC_MSI_IRQ=y && !CONFIG_X86_LOCAL

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Message-ID: <169709193403.3135.8043258061582152833.tip-bot2@tip-bot2>
Date:   Thu, 12 Oct 2023 06:25:34 -0000
From:   "tip-bot2 for Lu Yao" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     kernel test robot <lkp@...el.com>, Lu Yao <yaolu@...inos.cn>,
        Ingo Molnar <mingo@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/apic] x86/msi: Fix compile error caused by
 CONFIG_GENERIC_MSI_IRQ=y && !CONFIG_X86_LOCAL_APIC

The following commit has been merged into the x86/apic branch of tip:

Commit-ID:     441ccc351256533b6381e86a5648dbfe04b74286
Gitweb:        https://git.kernel.org/tip/441ccc351256533b6381e86a5648dbfe04b74286
Author:        Lu Yao <yaolu@...inos.cn>
AuthorDate:    Thu, 12 Oct 2023 11:26:59 +08:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Thu, 12 Oct 2023 08:13:27 +02:00

x86/msi: Fix compile error caused by CONFIG_GENERIC_MSI_IRQ=y && !CONFIG_X86_LOCAL_APIC

When compiling the x86 kernel, if X86_LOCAL_APIC is not enabled but
GENERIC_MSI_IRQ is selected in '.config', the following compilation
error will occur:

  include/linux/gpio/driver.h:38:19: error:
    field 'msiinfo' has incomplete type

  kernel/irq/msi.c:752:5: error: invalid use of incomplete typedef
    'msi_alloc_info_t' {aka 'struct irq_alloc_info'}

  kernel/irq/msi.c:740:1: error: control reaches end of non-void function

This is because file such as 'kernel/irq/msi.c' only depends on
'GENERIC_MSI_IRQ', and uses 'struct msi_alloc_info_t'. However,
this struct depends on 'X86_LOCAL_APIC'.

When enable 'GENERIC_MSI_IRQ' or 'X86_LOCAL_APIC' will select
'IRQ_DOMAIN_HIERARCHY', so exposing this struct using
'IRQ_DOMAIN_HIERARCHY' rather than 'X86_LOCAL_APIC'.

Under the above conditions, if 'HPET_TIMER' is selected, the following
compilation error will occur:

  arch/x86/kernel/hpet.c:550:13: error: ‘x86_vector_domain’ undeclared

  arch/x86/kernel/hpet.c:600:9: error: implicit declaration of
    function ‘init_irq_alloc_info’

This is because 'x86_vector_domain' is defined in 'kernel/apic/vector.c'
which is compiled only when 'X86_LOCAL_APIC' is enabled. Besides,
function 'msi_domain_set_affinity' is defined in 'include/linux/msi.h'
which depends on 'GENERIC_MSI_IRQ'. So use 'X86_LOCAL_APIC' and
'GENERIC_MSI_IRQ' to expose these code.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Lu Yao <yaolu@...inos.cn>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Randy Dunlap <rdunlap@...radead.org>
Tested-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20231012032659.323251-1-yaolu@kylinos.cn
---
 arch/x86/include/asm/hw_irq.h | 6 +++---
 arch/x86/kernel/hpet.c        | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 5518298..b02c3cd 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -28,7 +28,7 @@
 #include <asm/irq.h>
 #include <asm/sections.h>
 
-#ifdef	CONFIG_X86_LOCAL_APIC
+#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
 struct irq_data;
 struct pci_dev;
 struct msi_desc;
@@ -105,10 +105,10 @@ static inline void irq_complete_move(struct irq_cfg *c) { }
 #endif
 
 extern void apic_ack_edge(struct irq_data *data);
-#else	/*  CONFIG_X86_LOCAL_APIC */
+#else	/*  CONFIG_IRQ_DOMAIN_HIERARCHY */
 static inline void lock_vector_lock(void) {}
 static inline void unlock_vector_lock(void) {}
-#endif	/* CONFIG_X86_LOCAL_APIC */
+#endif	/* CONFIG_IRQ_DOMAIN_HIERARCHY */
 
 /* Statistics */
 extern atomic_t irq_err_count;
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 1648aa0..41eecf1 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -52,7 +52,7 @@ unsigned long				hpet_address;
 u8					hpet_blockid; /* OS timer block num */
 bool					hpet_msi_disable;
 
-#ifdef CONFIG_GENERIC_MSI_IRQ
+#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_GENERIC_MSI_IRQ)
 static DEFINE_PER_CPU(struct hpet_channel *, cpu_hpet_channel);
 static struct irq_domain		*hpet_domain;
 #endif
@@ -469,7 +469,7 @@ static void __init hpet_legacy_clockevent_register(struct hpet_channel *hc)
 /*
  * HPET MSI Support
  */
-#ifdef CONFIG_GENERIC_MSI_IRQ
+#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_GENERIC_MSI_IRQ)
 static void hpet_msi_unmask(struct irq_data *data)
 {
 	struct hpet_channel *hc = irq_data_get_irq_handler_data(data);