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tile: define a macro ktext_writable_addr to get writable kernel text address

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It is used by kgdb, ftrace, kprobe and jump label, so we factor
this out into a helper routine.

Reviewed-by: Chris Metcalf <cmetcalf@ezchip.com>
Signed-off-by: Zhigang Lu <zlu@ezchip.com>
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
This commit is contained in:
Zhigang Lu
2015-09-30 09:53:47 +08:00
committed by Chris Metcalf
parent 9f9499ae8e
commit f419e6f63c
4 changed files with 14 additions and 4 deletions
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10
arch/tile/include/asm/page.h
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@@ -319,6 +319,16 @@ 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);