linux-kernel - [PATCH] ARM: include <asm/pgtable.h> from proc-macros.S to fix -Wundef warnings

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Date:   Sat,  7 Jan 2023 01:18:21 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     patches@...linux.org.uk
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Russell King <linux@...linux.org.uk>
Subject: [PATCH] ARM: include <asm/pgtable.h> from proc-macros.S to fix -Wundef warnings

Since commit 80b6093b55e3 ("kbuild: add -Wundef to KBUILD_CPPFLAGS
for W=1 builds"), building with W=1 detects -Wundef warnings for
assembly code.

  $ make W=1 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-  arch/arm/mm/
    [snip]
    AS      arch/arm/mm/cache-v7.o
  In file included from arch/arm/mm/cache-v7.S:17:
  arch/arm/mm/proc-macros.S:109:5: warning: "L_PTE_SHARED" is not defined, evaluates to 0 [-Wundef]
    109 | #if L_PTE_SHARED != PTE_EXT_SHARED
        |     ^~~~~~~~~~~~
  arch/arm/mm/proc-macros.S:109:21: warning: "PTE_EXT_SHARED" is not defined, evaluates to 0 [-Wundef]
    109 | #if L_PTE_SHARED != PTE_EXT_SHARED
        |                     ^~~~~~~~~~~~~~
  arch/arm/mm/proc-macros.S:113:10: warning: "L_PTE_XN" is not defined, evaluates to 0 [-Wundef]
    113 |         (L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\
        |          ^~~~~~~~
  arch/arm/mm/proc-macros.S:113:19: warning: "L_PTE_USER" is not defined, evaluates to 0 [-Wundef]
    113 |         (L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\
        |                   ^~~~~~~~~~
  arch/arm/mm/proc-macros.S:113:30: warning: "L_PTE_RDONLY" is not defined, evaluates to 0 [-Wundef]
    113 |         (L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\
        |                              ^~~~~~~~~~~~
  arch/arm/mm/proc-macros.S:113:43: warning: "L_PTE_DIRTY" is not defined, evaluates to 0 [-Wundef]
    113 |         (L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\
        |                                           ^~~~~~~~~~~
  arch/arm/mm/proc-macros.S:113:55: warning: "L_PTE_YOUNG" is not defined, evaluates to 0 [-Wundef]
    113 |         (L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\
        |                                                       ^~~~~~~~~~~
  arch/arm/mm/proc-macros.S:114:10: warning: "L_PTE_PRESENT" is not defined, evaluates to 0 [-Wundef]
    114 |          L_PTE_PRESENT) > L_PTE_SHARED
        |          ^~~~~~~~~~~~~
  arch/arm/mm/proc-macros.S:114:27: warning: "L_PTE_SHARED" is not defined, evaluates to 0 [-Wundef]
    114 |          L_PTE_PRESENT) > L_PTE_SHARED
        |                           ^~~~~~~~~~~~

Include <asm/pgtable.h> from proc-macros.S to fix the warnings.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

KernelVersion: v6.2-rc1


 arch/arm/mm/proc-macros.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mm/proc-macros.S b/arch/arm/mm/proc-macros.S
index fa6999e24b07..e43f6d716b4b 100644
--- a/arch/arm/mm/proc-macros.S
+++ b/arch/arm/mm/proc-macros.S
@@ -6,6 +6,7 @@
  *  VM_EXEC
  */
 #include <asm/asm-offsets.h>
+#include <asm/pgtable.h>
 #include <asm/thread_info.h>
 
 #ifdef CONFIG_CPU_V7M
-- 
2.34.1