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| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2020-06-29 11:15:23 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-07-27 00:01:30 +1000 |
| commit | b6be1bb7f7216b9e9f33f57abe6e3290c0e66bd4 (patch) | |
| tree | 0100142b94e27eec5f0db65d8a7beeb783277a8e /arch/powerpc/include/asm/page.h | |
| parent | powerpc/32s: Only leave NX unset on segments used for modules (diff) | |
| download | linux-dev-b6be1bb7f7216b9e9f33f57abe6e3290c0e66bd4.tar.xz linux-dev-b6be1bb7f7216b9e9f33f57abe6e3290c0e66bd4.zip | |
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/include/asm/page.h')
| -rw-r--r-- | arch/powerpc/include/asm/page.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index a63fe6f3a0ff..254687258f42 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -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 |