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authorChristophe Leroy <christophe.leroy@csgroup.eu>2020-06-29 14:15:23 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2020-07-26 17:01:30 +0300
commitb6be1bb7f7216b9e9f33f57abe6e3290c0e66bd4 (patch)
tree0100142b94e27eec5f0db65d8a7beeb783277a8e /arch/powerpc/mm/ptdump/ptdump.c
parentc496433197154144c310a17939736bc5c155914d (diff)
downloadlinux-b6be1bb7f7216b9e9f33f57abe6e3290c0e66bd4.tar.xz
powerpc/32: 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@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/b38b52cd8dabbb56fbd6f9219d6f3cdccbb43b44.1593428200.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/mm/ptdump/ptdump.c')
-rw-r--r--arch/powerpc/mm/ptdump/ptdump.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
index de6e05ef871c..9d942136c7be 100644
--- a/arch/powerpc/mm/ptdump/ptdump.c
+++ b/arch/powerpc/mm/ptdump/ptdump.c
@@ -348,7 +348,11 @@ static void populate_markers(void)
{
int i = 0;
+#ifdef CONFIG_PPC64
address_markers[i++].start_address = PAGE_OFFSET;
+#else
+ address_markers[i++].start_address = TASK_SIZE;
+#endif
address_markers[i++].start_address = VMALLOC_START;
address_markers[i++].start_address = VMALLOC_END;
#ifdef CONFIG_PPC64
@@ -385,7 +389,7 @@ 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 = IS_ENABLED(CONFIG_PPC64) ? PAGE_OFFSET : TASK_SIZE,
};
#ifdef CONFIG_PPC64
@@ -429,7 +433,7 @@ void ptdump_check_wx(void)
.seq = NULL,
.marker = address_markers,
.check_wx = true,
- .start_address = PAGE_OFFSET,
+ .start_address = IS_ENABLED(CONFIG_PPC64) ? PAGE_OFFSET : TASK_SIZE,
};
#ifdef CONFIG_PPC64