linux-kernel - [tip: x86/platform] x86/of: Move the x86_flattree_get_config() call out of x86_dtb

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Date:   Mon, 02 Oct 2023 19:41:03 -0000
From:   "tip-bot2 for Saurabh Sengar" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Saurabh Sengar <ssengar@...ux.microsoft.com>,
        Ingo Molnar <mingo@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/platform] x86/of: Move the x86_flattree_get_config() call
 out of x86_dtb_init()

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

Commit-ID:     0d294c8c4efa5c0f283a6dfc82dc014a5dbd9308
Gitweb:        https://git.kernel.org/tip/0d294c8c4efa5c0f283a6dfc82dc014a5dbd9308
Author:        Saurabh Sengar <ssengar@...ux.microsoft.com>
AuthorDate:    Fri, 25 Aug 2023 00:47:36 -07:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Mon, 02 Oct 2023 21:30:09 +02:00

x86/of: Move the x86_flattree_get_config() call out of x86_dtb_init()

Fetching the device tree configuration before initmem_init() is necessary
to allow the parsing of NUMA node information. However moving the entire
x86_dtb_init() call before initmem_init() is not correct as APIC/IO-APIC enumeration
has to be after initmem_init().

Thus, move the x86_flattree_get_config() call out of x86_dtb_init(),
into setup_arch(), to call it before initmem_init(), and
leave the ACPI/IOAPIC registration sequence as-is.

[ mingo: Updated the changelog for clarity. ]

Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Link: https://lore.kernel.org/r/1692949657-16446-1-git-send-email-ssengar@linux.microsoft.com
---
 arch/x86/include/asm/prom.h  | 5 +++++
 arch/x86/kernel/devicetree.c | 6 +-----
 arch/x86/kernel/setup.c      | 2 ++
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/prom.h b/arch/x86/include/asm/prom.h
index b716d29..65dee24 100644
--- a/arch/x86/include/asm/prom.h
+++ b/arch/x86/include/asm/prom.h
@@ -31,6 +31,11 @@ static inline void x86_dtb_init(void) { }
 #define of_ioapic 0
 #endif
 
+#ifdef CONFIG_OF_EARLY_FLATTREE
+void x86_flattree_get_config(void);
+#else
+static inline void x86_flattree_get_config(void) { }
+#endif
 extern char cmd_line[COMMAND_LINE_SIZE];
 
 #endif /* __ASSEMBLY__ */
diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index 87d38f1..afd0992 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -278,7 +278,7 @@ static void __init dtb_apic_setup(void)
 }
 
 #ifdef CONFIG_OF_EARLY_FLATTREE
-static void __init x86_flattree_get_config(void)
+void __init x86_flattree_get_config(void)
 {
 	u32 size, map_len;
 	void *dt;
@@ -300,14 +300,10 @@ static void __init x86_flattree_get_config(void)
 	unflatten_and_copy_device_tree();
 	early_memunmap(dt, map_len);
 }
-#else
-static inline void x86_flattree_get_config(void) { }
 #endif
 
 void __init x86_dtb_init(void)
 {
-	x86_flattree_get_config();
-
 	if (!of_have_populated_dt())
 		return;
 
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index b9145a6..ef73704 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1221,6 +1221,8 @@ void __init setup_arch(char **cmdline_p)
 
 	early_acpi_boot_init();
 
+	x86_flattree_get_config();
+
 	initmem_init();
 	dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);