linux-kernel - Re: [PATCH v6 10/12] mmap locking API: rename mmap_sem to mmap

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Date:   Thu, 4 Jun 2020 12:35:06 +0800
From:   youling 257 <youling257@...il.com>
To:     walken@...gle.com
Cc:     Liam.Howlett@...cle.com, akpm@...ux-foundation.org,
        daniel.m.jordan@...cle.com, dave@...olabs.net, hughd@...gle.com,
        jgg@...pe.ca, jglisse@...hat.com, jhubbard@...dia.com,
        ldufour@...ux.ibm.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, peterz@...radead.org, rientjes@...gle.com,
        vbabka@...e.cz, willy@...radead.org, yinghan@...gle.com,
        youling257 <youling257@...il.com>
Subject: Re: [PATCH v6 10/12] mmap locking API: rename mmap_sem to mmap_lock

I have build error about kernel/sys.c,


kernel/sys.c: In function ‘prctl_set_vma’:

kernel/sys.c:2392:18: error:

‘struct mm_struct’ has no member named ‘mmap_sem’; did you mean

‘mmap_base’?

  2392 |  down_write(&mm->mmap_sem);

       |                  ^~~~~~~~

       |                  mmap_base

kernel/sys.c:2402:16: error:

‘struct mm_struct’ has no member named ‘mmap_sem’; did you mean

‘mmap_base’?

  2402 |  up_write(&mm->mmap_sem);

       |                ^~~~~~~~

       |                mmap_base



why not rename kernel/sys.c mmap_sem to mmap_lock?


diff --git a/kernel/sys.c b/kernel/sys.c

index 113955fe1c6b..043c04a745a9 100644

--- a/kernel/sys.c

+++ b/kernel/sys.c

@@ -2389,7 +2389,7 @@ static int prctl_set_vma(unsigned long opt,
unsigned long start,

      if (end == start)

          return 0;

-    down_write(&mm->mmap_sem);

+    down_write(&mm->mmap_lock);

      switch (opt) {

      case PR_SET_VMA_ANON_NAME:

@@ -2399,7 +2399,7 @@ static int prctl_set_vma(unsigned long opt,
unsigned long start,

          error = -EINVAL;

      }

-    up_write(&mm->mmap_sem);

+    up_write(&mm->mmap_lock);

      return error;

  }