linux-kernel - [RFC PATCH] x86/acpi: Drop duplicate BOOT table initialization

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Date:   Fri, 15 Nov 2019 17:24:24 +0800
From:   Shiyang Ruan <ruansy.fnst@...fujitsu.com>
To:     <x86@...nel.org>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <rjw@...ysocki.net>, <len.brown@...el.com>, <pavel@....cz>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <hpa@...or.com>, Cao jin <caoj.fnst@...fujitsu.com>,
        <linux-acpi@...r.kernel.org>
Subject: [RFC PATCH] x86/acpi: Drop duplicate BOOT table initialization

From: Cao jin <caoj.fnst@...fujitsu.com>

ACPI BOOT table is initialized in both acpi_boot_table_init &
acpi_boot_init of setup_arch, but its usage is quite late at the end of
start_kernel. It should be safe to drop one of them. Since it is less
related with table init, drop it from there.

Signed-off-by: Cao jin <caoj.fnst@...fujitsu.com>
Cc: <linux-acpi@...r.kernel.org>
Signed-off-by: Shiyang Ruan <ruansy.fnst@...fujitsu.com>
---
 arch/x86/kernel/acpi/boot.c | 2 --
 1 file changed, 2 deletions(-)

It existed since git repo is built, so it might has its reason? The
patch is not tested since I don't have BOOT table in my firmware.

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 04205ce127a1..ca1c15bb0b48 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1558,8 +1558,6 @@ void __init acpi_boot_table_init(void)
 		return;
 	}
 
-	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
-
 	/*
 	 * blacklist may disable ACPI entirely
 	 */
-- 
2.21.0