linux-kernel - [PATCH v3] x86/msi: Fix compile error caused by GENERIC_MSI_IRQ and X86_LOCAL

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Message-Id: <20231012032659.323251-1-yaolu@kylinos.cn>
Date:   Thu, 12 Oct 2023 11:26:59 +0800
From:   Lu Yao <yaolu@...inos.cn>
To:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org
Cc:     hpa@...or.com, linux-kernel@...r.kernel.org, rdunlap@...radead.org,
        lkp@...el.com, Lu Yao <yaolu@...inos.cn>
Subject: [PATCH v3] x86/msi: Fix compile error caused by GENERIC_MSI_IRQ and 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.

Tested-by: Randy Dunlap <rdunlap@...radead.org>
Signed-off-by: Lu Yao <yaolu@...inos.cn>
---
Change from v2:
 * Fix arch/x86/kernel/hpet.c compiled error when enable 'X86_LOCAL_APIC'
   'HPET_TIMER' but disable 'GENERIC_MSI_IRQ'.
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202310120849.zrfrI44Z-lkp@intel.com/
v2: https://patchew.org/linux/20231011055749.98840-1-yaolu@kylinos.cn/

Change from v1:
 * Fix arch/x86/kernel/hpet.c compiled error when enable 'X86_LOCAL_APIC'
   'GENERIC_MSI_IRQ' 'HPET_TIMER'
Thanks to Randy for the feedback.
v1: https://lore.kernel.org/lkml/20231008082827.279154-1-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 551829884734..b02c3cd3c0f6 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 1648aa0204d9..41eecf180b7f 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);
-- 
2.25.1