linux-kernel - [PATCH] x86/setup: Explicitly include acpi.h

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Date:   Tue, 31 Aug 2021 19:15:11 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org
Cc:     "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        Maurizio Lombardi <mlombard@...hat.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Konrad Rzeszutek Wilk <konrad@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH] x86/setup: Explicitly include acpi.h

After commit 342f43af70db ("iscsi_ibft: fix crash due to KASLR physical
memory remapping"), certain configurations show the following errors:

arch/x86/kernel/setup.c: In function ‘setup_arch’:
arch/x86/kernel/setup.c:916:13: error: implicit declaration of function ‘acpi_mps_check’ [-Werror=implicit-function-declaration]
  916 |         if (acpi_mps_check()) {
      |             ^~~~~~~~~~~~~~
arch/x86/kernel/setup.c:1110:9: error: implicit declaration of function ‘acpi_table_upgrade’ [-Werror=implicit-function-declaration]
 1110 |         acpi_table_upgrade();
      |         ^~~~~~~~~~~~~~~~~~
arch/x86/kernel/setup.c:1112:9: error: implicit declaration of function ‘acpi_boot_table_init’ [-Werror=implicit-function-declaration]
 1112 |         acpi_boot_table_init();
      |         ^~~~~~~~~~~~~~~~~~~~
arch/x86/kernel/setup.c:1120:9: error: implicit declaration of function ‘early_acpi_boot_init’; did you mean ‘early_cpu_init’? [-Werror=implicit-function-declaration]
 1120 |         early_acpi_boot_init();
      |         ^~~~~~~~~~~~~~~~~~~~
      |         early_cpu_init
arch/x86/kernel/setup.c:1162:9: error: implicit declaration of function ‘acpi_boot_init’ [-Werror=implicit-function-declaration]
 1162 |         acpi_boot_init();
      |         ^~~~~~~~~~~~~~
cc1: some warnings being treated as errors

acpi.h was being implicitly included from iscsi_ibft.h in these
configurations so the removal of that means these functions have no
definition or declaration. Add acpi.h explicitly so there is no more
error.

Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---

* No fixes tag as I doubt the mentioned commit is the root cause.

* The configuration was WSL2's, I did not drill down exactly which set
  of configs triggers this but it is pretty obvious what is going on
  here.

 arch/x86/kernel/setup.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 63b20536c8d2..79f164141116 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -5,6 +5,7 @@
  * This file contains the setup_arch() code, which handles the architecture-dependent
  * parts of early kernel initialization.
  */
+#include <linux/acpi.h>
 #include <linux/console.h>
 #include <linux/crash_dump.h>
 #include <linux/dma-map-ops.h>

base-commit: 9e9fb7655ed585da8f468e29221f0ba194a5f613
-- 
2.33.0