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powerpc/32: Set user/kernel boundary at TASK_SIZE instead of PAGE_OFFSET

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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
This commit is contained in:
Christophe Leroy 2020-06-29 11:15:23 +00:00 committed by Michael Ellerman
parent c496433197
commit b6be1bb7f7
2 changed files with 9 additions and 3 deletions
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4
arch/powerpc/include/asm/page.h
View File

@ -255,8 +255,10 @@ static inline bool pfn_valid(unsigned long pfn)
*/
#ifdef CONFIG_PPC_BOOK3E_64
#define is_kernel_addr(x) ((x) >= 0x8000000000000000ul)
#else
#elif defined(CONFIG_PPC_BOOK3S_64)
#define is_kernel_addr(x) ((x) >= PAGE_OFFSET)
#else
#define is_kernel_addr(x) ((x) >= TASK_SIZE)
#endif
#ifndef CONFIG_PPC_BOOK3S_64

8
arch/powerpc/mm/ptdump/ptdump.c
View File

@ -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