diff options
| author | Ritesh Harjani (IBM) <ritesh.list@gmail.com> | 2024-10-18 22:59:50 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2024-10-23 18:53:20 +1100 |
| commit | 8fec58f503b296af87ffca3898965e3054f2b616 (patch) | |
| tree | 71e50d4e7acf3673c27cc4c0cd3d0673984d05f9 /arch/powerpc/include/asm | |
| parent | 47dd2e63d42a7a1b0a9c374d3a236f58b97c19e6 (diff) | |
book3s64/hash: Add kfence functionality
Now that linear map functionality of debug_pagealloc is made generic,
enable kfence to use this generic infrastructure.
1. Define kfence related linear map variables.
- u8 *linear_map_kf_hash_slots;
- unsigned long linear_map_kf_hash_count;
- DEFINE_RAW_SPINLOCK(linear_map_kf_hash_lock);
2. The linear map size allocated in RMA region is quite small
(KFENCE_POOL_SIZE >> PAGE_SHIFT) which is 512 bytes by default.
3. kfence pool memory is reserved using memblock_phys_alloc() which has
can come from anywhere.
(default 255 objects => ((1+255) * 2) << PAGE_SHIFT = 32MB)
4. The hash slot information for kfence memory gets added in linear map
in hash_linear_map_add_slot() (which also adds for debug_pagealloc).
Reported-by: Pavithra Prakash <pavrampu@linux.vnet.ibm.com>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/5c2b61941b344077a2b8654dab46efa0322af3af.1729271995.git.ritesh.list@gmail.com
Diffstat (limited to 'arch/powerpc/include/asm')
| -rw-r--r-- | arch/powerpc/include/asm/kfence.h | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/arch/powerpc/include/asm/kfence.h b/arch/powerpc/include/asm/kfence.h index f3a9476a71b3..fab124ada1c7 100644 --- a/arch/powerpc/include/asm/kfence.h +++ b/arch/powerpc/include/asm/kfence.h @@ -10,7 +10,6 @@ #include <linux/mm.h> #include <asm/pgtable.h> -#include <asm/mmu.h> #ifdef CONFIG_PPC64_ELF_ABI_V1 #define ARCH_FUNC_PREFIX "." @@ -26,10 +25,6 @@ static inline void disable_kfence(void) static inline bool arch_kfence_init_pool(void) { -#ifdef CONFIG_PPC64 - if (!radix_enabled()) - return false; -#endif return !kfence_disabled; } #endif |