[PATCH 55/64] arch/riscv: use mm locking wrappers

[Davidlohr Bueso]

From: Davidlohr Bueso <d...@stgolabs.net>

This becomes quite straightforward with the mmrange in place.

Signed-off-by: Davidlohr Bueso <dbu...@suse.de>
---
 arch/riscv/kernel/vdso.c |  5 +++--
 arch/riscv/mm/fault.c    | 10 +++++-----
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
index 582cb153eb24..4bbb6e0425df 100644
--- a/arch/riscv/kernel/vdso.c
+++ b/arch/riscv/kernel/vdso.c
@@ -69,10 +69,11 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
        struct mm_struct *mm = current->mm;
        unsigned long vdso_base, vdso_len;
        int ret;
+       DEFINE_RANGE_LOCK_FULL(mmrange);
 
        vdso_len = (vdso_pages + 1) << PAGE_SHIFT;
 
-       down_write(&mm->mmap_sem);
+       mm_write_lock(mm, &mmrange);
        vdso_base = get_unmapped_area(NULL, 0, vdso_len, 0, 0);
        if (IS_ERR_VALUE(vdso_base)) {
                ret = vdso_base;
@@ -94,7 +95,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
                mm->context.vdso = NULL;
 
 end:
-       up_write(&mm->mmap_sem);
+       mm_write_unlock(mm, &mmrange);
        return ret;
 }
 
diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index 75d15e73ba39..6f78080e987c 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -79,7 +79,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
        perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr);
 
 retry:
-       down_read(&mm->mmap_sem);
+       mm_read_lock(mm, &mmrange);
        vma = find_vma(mm, addr);
        if (unlikely(!vma))
                goto bad_area;
@@ -170,7 +170,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
                }
        }
 
-       up_read(&mm->mmap_sem);
+       mm_read_unlock(mm, &mmrange);
        return;
 
        /*
@@ -178,7 +178,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
         * Fix it, but check if it's kernel or user first.
         */
 bad_area:
-       up_read(&mm->mmap_sem);
+       mm_read_unlock(mm, &mmrange);
        /* User mode accesses just cause a SIGSEGV */
        if (user_mode(regs)) {
                do_trap(regs, SIGSEGV, code, addr, tsk);
@@ -206,14 +206,14 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
         * (which will retry the fault, or kill us if we got oom-killed).
         */
 out_of_memory:
-       up_read(&mm->mmap_sem);
+       mm_read_unlock(mm, &mmrange);
        if (!user_mode(regs))
                goto no_context;
        pagefault_out_of_memory();
        return;
 
 do_sigbus:
-       up_read(&mm->mmap_sem);
+       mm_read_unlock(mm, &mmrange);
        /* Kernel mode? Handle exceptions or die */
        if (!user_mode(regs))
                goto no_context;
-- 
2.13.6