linux-kernel - [PATCH v2] powerpc/ptdump: don't entirely rebuild kernel when selecting CONFIG_PPC_DEBUG

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Message-Id: <bf34fd9dca61eadf9a134a9f89ebbc162cfd5f86.1578986011.git.christophe.leroy@c-s.fr>
Date:   Tue, 14 Jan 2020 07:14:40 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2] powerpc/ptdump: don't entirely rebuild kernel when
 selecting CONFIG_PPC_DEBUG_WX

Selecting CONFIG_PPC_DEBUG_WX only impacts ptdump and pgtable_32/64
init calls. Declaring related functions in asm/pgtable.h implies
rebuilding almost everything.

Move ptdump_check_wx() declaration in mm/mmu_decl.h

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
v2: use mm/mmu_decl.h instead of a new asm/ptdump.h
---
 arch/powerpc/include/asm/pgtable.h | 6 ------
 arch/powerpc/mm/mmu_decl.h         | 6 ++++++
 arch/powerpc/mm/ptdump/ptdump.c    | 2 ++
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 0e4ec8cc37b7..8cc543ed114c 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -94,12 +94,6 @@ void mark_initmem_nx(void);
 static inline void mark_initmem_nx(void) { }
 #endif
 
-#ifdef CONFIG_PPC_DEBUG_WX
-void ptdump_check_wx(void);
-#else
-static inline void ptdump_check_wx(void) { }
-#endif
-
 /*
  * When used, PTE_FRAG_NR is defined in subarch pgtable.h
  * so we are sure it is included when arriving here.
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index 8e99649c24fc..7097e07a209a 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -181,3 +181,9 @@ void mmu_mark_rodata_ro(void);
 static inline void mmu_mark_initmem_nx(void) { }
 static inline void mmu_mark_rodata_ro(void) { }
 #endif
+
+#ifdef CONFIG_PPC_DEBUG_WX
+void ptdump_check_wx(void);
+#else
+static inline void ptdump_check_wx(void) { }
+#endif
diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
index 2f9ddc29c535..4af0d5d9589e 100644
--- a/arch/powerpc/mm/ptdump/ptdump.c
+++ b/arch/powerpc/mm/ptdump/ptdump.c
@@ -24,6 +24,8 @@
 #include <asm/page.h>
 #include <asm/pgalloc.h>
 
+#include <mm/mmu_decl.h>
+
 #include "ptdump.h"
 
 /*
-- 
2.13.3