linux-kernel - [PATCH linux-next 1/3] x86, crash: don't nest CONFIG_CRASH_DUMP ifdef inside CONFIG_KEXEC

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Message-ID: <20240129135033.157195-1-bhe@redhat.com>
Date: Mon, 29 Jan 2024 21:50:31 +0800
From: Baoquan He <bhe@...hat.com>
To: kexec@...ts.infradead.org,
	akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org,
	x86@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org,
	nathan@...nel.org,
	mhklinux@...look.com,
	Baoquan He <bhe@...hat.com>
Subject: [PATCH linux-next 1/3] x86, crash: don't nest CONFIG_CRASH_DUMP ifdef inside CONFIG_KEXEC_CODE ifdef scope

Michael pointed out that the #ifdef CONFIG_CRASH_DUMP is nested inside
arch/x86/xen/enlighten_hvm.c.

Although the nesting works well too since CONFIG_CRASH_DUMP has
dependency on CONFIG_KEXEC_CORE, it may cause confuse because there
are places where it's not nested, and people may think it need be nested
even though it doesn't have to.

Fix that by moving  CONFIG_CRASH_DUMP ifdeffery of codes out of
CONFIG_KEXEC_CODE ifdeffery scope.

And also fix a building error Nathan reported as below by replacing
CONFIG_KEXEC_CORE ifdef with CONFIG_VMCORE_INFO ifdef.

====
$ curl -LSso .config https://git.alpinelinux.org/aports/plain/community/linux-edge/config-edge.x86_64
$ make -skj"$(nproc)" ARCH=x86_64 CROSS_COMPILE=x86_64-linux- olddefconfig all
..
x86_64-linux-ld: arch/x86/xen/mmu_pv.o: in function `paddr_vmcoreinfo_note':
mmu_pv.c:(.text+0x3af3): undefined reference to `vmcoreinfo_note'
====

Link: https://lore.kernel.org/all/SN6PR02MB4157931105FA68D72E3D3DB8D47B2@SN6PR02MB4157.namprd02.prod.outlook.com/T/#u
Link: https://lore.kernel.org/all/20240126045551.GA126645@dev-arch.thelio-3990X/T/#u
Signed-off-by: Baoquan He <bhe@...hat.com>
---
 arch/x86/kernel/cpu/mshyperv.c | 10 ++++++----
 arch/x86/kernel/reboot.c       |  2 +-
 arch/x86/xen/enlighten_hvm.c   |  4 ++--
 arch/x86/xen/mmu_pv.c          |  2 +-
 4 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index f8163a59026b..2e8cd5a4ae85 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -209,6 +209,7 @@ static void hv_machine_shutdown(void)
 	if (kexec_in_progress)
 		hyperv_cleanup();
 }
+#endif /* CONFIG_KEXEC_CORE */
 
 #ifdef CONFIG_CRASH_DUMP
 static void hv_machine_crash_shutdown(struct pt_regs *regs)
@@ -222,8 +223,7 @@ static void hv_machine_crash_shutdown(struct pt_regs *regs)
 	/* Disable the hypercall page when there is only 1 active CPU. */
 	hyperv_cleanup();
 }
-#endif
-#endif /* CONFIG_KEXEC_CORE */
+#endif /* CONFIG_CRASH_DUMP */
 #endif /* CONFIG_HYPERV */
 
 static uint32_t  __init ms_hyperv_platform(void)
@@ -497,9 +497,11 @@ static void __init ms_hyperv_init_platform(void)
 	no_timer_check = 1;
 #endif
 
-#if IS_ENABLED(CONFIG_HYPERV) && defined(CONFIG_KEXEC_CORE)
+#if IS_ENABLED(CONFIG_HYPERV)
+#if defined(CONFIG_KEXEC_CORE)
 	machine_ops.shutdown = hv_machine_shutdown;
-#ifdef CONFIG_CRASH_DUMP
+#endif
+#if defined(CONFIG_CRASH_DUMP)
 	machine_ops.crash_shutdown = hv_machine_crash_shutdown;
 #endif
 #endif
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 1287b0d5962f..f3130f762784 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -826,7 +826,7 @@ void machine_halt(void)
 	machine_ops.halt();
 }
 
-#ifdef CONFIG_KEXEC_CORE
+#ifdef CONFIG_CRASH_DUMP
 void machine_crash_shutdown(struct pt_regs *regs)
 {
 	machine_ops.crash_shutdown(regs);
diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c
index 09e3db7ff990..0b367c1e086d 100644
--- a/arch/x86/xen/enlighten_hvm.c
+++ b/arch/x86/xen/enlighten_hvm.c
@@ -148,6 +148,7 @@ static void xen_hvm_shutdown(void)
 	if (kexec_in_progress)
 		xen_reboot(SHUTDOWN_soft_reset);
 }
+#endif
 
 #ifdef CONFIG_CRASH_DUMP
 static void xen_hvm_crash_shutdown(struct pt_regs *regs)
@@ -156,7 +157,6 @@ static void xen_hvm_crash_shutdown(struct pt_regs *regs)
 	xen_reboot(SHUTDOWN_soft_reset);
 }
 #endif
-#endif
 
 static int xen_cpu_up_prepare_hvm(unsigned int cpu)
 {
@@ -238,10 +238,10 @@ static void __init xen_hvm_guest_init(void)
 
 #ifdef CONFIG_KEXEC_CORE
 	machine_ops.shutdown = xen_hvm_shutdown;
+#endif
 #ifdef CONFIG_CRASH_DUMP
 	machine_ops.crash_shutdown = xen_hvm_crash_shutdown;
 #endif
-#endif
 }
 
 static __init int xen_parse_nopv(char *arg)
diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
index 218773cfb009..e21974f2cf2d 100644
--- a/arch/x86/xen/mmu_pv.c
+++ b/arch/x86/xen/mmu_pv.c
@@ -2520,7 +2520,7 @@ int xen_remap_pfn(struct vm_area_struct *vma, unsigned long addr,
 }
 EXPORT_SYMBOL_GPL(xen_remap_pfn);
 
-#ifdef CONFIG_KEXEC_CORE
+#ifdef CONFIG_VMCORE_INFO
 phys_addr_t paddr_vmcoreinfo_note(void)
 {
 	if (xen_pv_domain())
-- 
2.41.0