diff options
Diffstat (limited to 'arch/tile/include/asm/page.h')
| -rw-r--r-- | arch/tile/include/asm/page.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/tile/include/asm/page.h b/arch/tile/include/asm/page.h index 8eca6a0e1762..498a5f71245d 100644 --- a/arch/tile/include/asm/page.h +++ b/arch/tile/include/asm/page.h @@ -321,6 +321,16 @@ static inline int pfn_valid(unsigned long pfn) #define virt_to_page(kaddr) pfn_to_page(kaddr_to_pfn((void *)(kaddr))) #define page_to_virt(page) pfn_to_kaddr(page_to_pfn(page)) +/* + * The kernel text is mapped at MEM_SV_START as read-only. To allow + * modifying kernel text, it is also mapped at PAGE_OFFSET as read-write. + * This macro converts a kernel address to its writable kernel text mapping, + * which is used to modify the text code on a running kernel by kgdb, + * ftrace, kprobe, jump label, etc. + */ +#define ktext_writable_addr(kaddr) \ + ((unsigned long)(kaddr) - MEM_SV_START + PAGE_OFFSET) + struct mm_struct; extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr); extern pte_t *virt_to_kpte(unsigned long kaddr); |