linux-kernel - [PATCH v1 3/8] powerpc: Set user/kernel boundary at TASK_SIZE instead of PAGE

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Message-Id: <c634cadd3ef2c9667838c4fe2bd425a72c8fcbd5.1592578278.git.christophe.leroy@csgroup.eu>
Date:   Fri, 19 Jun 2020 15:06:54 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
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 v1 3/8] powerpc: Set user/kernel boundary at TASK_SIZE instead
 of PAGE_OFFSET

User space stops at TASK_SIZE. At the moment, kernel space starts
at PAGE_OFFSET.

In order to use space between TASK_SIZE and PAGE_OFFSET for modules,
make TASK_SIZE the limit between user and kernel space.

Note that fault.c already considers TASK_SIZE as the boundary between
user and kernel space.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/include/asm/page.h | 2 +-
 arch/powerpc/mm/ptdump/ptdump.c | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index a63fe6f3a0ff..352a2b80d505 100644
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -256,7 +256,7 @@ static inline bool pfn_valid(unsigned long pfn)
 #ifdef CONFIG_PPC_BOOK3E_64
 #define is_kernel_addr(x)	((x) >= 0x8000000000000000ul)
 #else
-#define is_kernel_addr(x)	((x) >= PAGE_OFFSET)
+#define is_kernel_addr(x)	((x) >= TASK_SIZE)
 #endif
 
 #ifndef CONFIG_PPC_BOOK3S_64
diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
index b71cc628facd..e995f2e9e9f7 100644
--- a/arch/powerpc/mm/ptdump/ptdump.c
+++ b/arch/powerpc/mm/ptdump/ptdump.c
@@ -351,7 +351,7 @@ static void populate_markers(void)
 {
 	int i = 0;
 
-	address_markers[i++].start_address = PAGE_OFFSET;
+	address_markers[i++].start_address = TASK_SIZE;
 	address_markers[i++].start_address = VMALLOC_START;
 	address_markers[i++].start_address = VMALLOC_END;
 #ifdef CONFIG_PPC64
@@ -388,7 +388,7 @@ static int ptdump_show(struct seq_file *m, void *v)
 	struct pg_state st = {
 		.seq = m,
 		.marker = address_markers,
-		.start_address = PAGE_OFFSET,
+		.start_address = TASK_SIZE,
 	};
 
 #ifdef CONFIG_PPC64
@@ -432,7 +432,7 @@ void ptdump_check_wx(void)
 		.seq = NULL,
 		.marker = address_markers,
 		.check_wx = true,
-		.start_address = PAGE_OFFSET,
+		.start_address = TASK_SIZE,
 	};
 
 #ifdef CONFIG_PPC64
-- 
2.25.0