diff options
| -rw-r--r-- | arch/powerpc/lib/code-patching.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c index 73ce4b90bb1b..b00112d7ad46 100644 --- a/arch/powerpc/lib/code-patching.c +++ b/arch/powerpc/lib/code-patching.c @@ -178,7 +178,6 @@ static int text_area_cpu_up_mm(unsigned int cpu) this_cpu_write(cpu_patching_context.mm, mm); this_cpu_write(cpu_patching_context.addr, addr); - this_cpu_write(cpu_patching_context.pte, pte); return 0; @@ -195,7 +194,6 @@ static int text_area_cpu_down_mm(unsigned int cpu) this_cpu_write(cpu_patching_context.mm, NULL); this_cpu_write(cpu_patching_context.addr, 0); - this_cpu_write(cpu_patching_context.pte, NULL); return 0; } @@ -289,12 +287,16 @@ static int __do_patch_instruction_mm(u32 *addr, ppc_inst_t instr) unsigned long pfn = get_patch_pfn(addr); struct mm_struct *patching_mm; struct mm_struct *orig_mm; + spinlock_t *ptl; patching_mm = __this_cpu_read(cpu_patching_context.mm); - pte = __this_cpu_read(cpu_patching_context.pte); text_poke_addr = __this_cpu_read(cpu_patching_context.addr); patch_addr = (u32 *)(text_poke_addr + offset_in_page(addr)); + pte = get_locked_pte(patching_mm, text_poke_addr, &ptl); + if (!pte) + return -ENOMEM; + __set_pte_at(patching_mm, text_poke_addr, pte, pfn_pte(pfn, PAGE_KERNEL), 0); /* order PTE update before use, also serves as the hwsync */ @@ -321,6 +323,8 @@ static int __do_patch_instruction_mm(u32 *addr, ppc_inst_t instr) */ local_flush_tlb_page_psize(patching_mm, text_poke_addr, mmu_virtual_psize); + pte_unmap_unlock(pte, ptl); + return err; } |