Le 18/04/2017 à 08:40, Michael Ellerman a écrit :
Christophe Leroy <christophe.le...@c-s.fr> writes:
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index a65c0b4c0669..d506bd61b629 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -323,6 +323,26 @@ get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t
**ptep, pmd_t **pmdp)
return(retval);
}
+void remap_init_ram(void)
+{
+ unsigned long start = (unsigned long)_sinittext & PAGE_MASK;
+ unsigned long end = (unsigned long)_einittext;
+ unsigned long va;
+
+ for (va = start; va < end; va += PAGE_SIZE) {
+ pte_t *kpte;
+ pmd_t *kpmd;
+ pte_t pte = pfn_pte(__pa(va) >> PAGE_SHIFT, PAGE_KERNEL);
+
+ if (!get_pteptr(&init_mm, va, &kpte, &kpmd))
+ continue;
+ __set_pte_at(&init_mm, va, kpte, pte, 0);
+ wmb();
+ pte_unmap(kpte);
+ }
+ flush_tlb_kernel_range(start, end);
+}
Can we just use unmap_kernel_range() ?
We only want to remove the X bit.
I think unmap_kernel_range() will unmap the area, wheareas we want to
keep it as part of the linear data area.
Christophe
Is this sufficient on all 32-bit PPC? (I have no idea)
cheers
