Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) #ifndef _ASM_POWERPC_PTE_WALK_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #define _ASM_POWERPC_PTE_WALK_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) /* Don't use this directly */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) extern pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 			       bool *is_thp, unsigned *hshift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 				    bool *is_thp, unsigned *hshift)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 	pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #if defined(CONFIG_DEBUG_VM) &&						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	!(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	 * We should not find huge page if these configs are not enabled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	if (hshift)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		WARN_ON(*hshift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	return pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static inline pte_t *find_init_mm_pte(unsigned long ea, unsigned *hshift)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	pgd_t *pgdir = init_mm.pgd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	return __find_linux_pte(pgdir, ea, NULL, hshift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)  * This is what we should always use. Any other lockless page table lookup needs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)  * careful audit against THP split.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static inline pte_t *find_current_mm_pte(pgd_t *pgdir, unsigned long ea,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 					 bool *is_thp, unsigned *hshift)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	VM_WARN(pgdir != current->mm->pgd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		"%s lock less page table lookup called on wrong mm\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #if defined(CONFIG_DEBUG_VM) &&						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	!(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	 * We should not find huge page if these configs are not enabled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	if (hshift)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		WARN_ON(*hshift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	return pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #endif /* _ASM_POWERPC_PTE_WALK_H */