linux-kernel - [PATCH 02/14] mm/hmm: fix header file if/else/endif maze v2

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Message-Id: <20180317012039.3145-1-jglisse@redhat.com>
Date:   Fri, 16 Mar 2018 21:20:39 -0400
From:   jglisse@...hat.com
To:     linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Jérôme Glisse <jglisse@...hat.com>,
        stable@...r.kernel.org, Ralph Campbell <rcampbell@...dia.com>,
        John Hubbard <jhubbard@...dia.com>,
        Evgeny Baskakov <ebaskakov@...dia.com>
Subject: [PATCH 02/14] mm/hmm: fix header file if/else/endif maze v2

From: Jérôme Glisse <jglisse@...hat.com>

The #if/#else/#endif for IS_ENABLED(CONFIG_HMM) were wrong. Because
of this after multiple include there was multiple definition of both
hmm_mm_init() and hmm_mm_destroy() leading to build failure if HMM
was enabled (CONFIG_HMM set).

Changed since v1:
  - Fix the maze when CONFIG_HMM is disabled not just when it is
    enabled. This fix bot build failure.
  - Improved commit message.

Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
Acked-by: Balbir Singh <bsingharora@...il.com>
Cc: stable@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Ralph Campbell <rcampbell@...dia.com>
Cc: John Hubbard <jhubbard@...dia.com>
Cc: Evgeny Baskakov <ebaskakov@...dia.com>
---
 include/linux/hmm.h | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index 325017ad9311..36dd21fe5caf 100644
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -498,23 +498,16 @@ struct hmm_device {
 struct hmm_device *hmm_device_new(void *drvdata);
 void hmm_device_put(struct hmm_device *hmm_device);
 #endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
-#endif /* IS_ENABLED(CONFIG_HMM) */
 
 /* Below are for HMM internal use only! Not to be used by device driver! */
-#if IS_ENABLED(CONFIG_HMM_MIRROR)
 void hmm_mm_destroy(struct mm_struct *mm);
 
 static inline void hmm_mm_init(struct mm_struct *mm)
 {
 	mm->hmm = NULL;
 }
-#else /* IS_ENABLED(CONFIG_HMM_MIRROR) */
-static inline void hmm_mm_destroy(struct mm_struct *mm) {}
-static inline void hmm_mm_init(struct mm_struct *mm) {}
-#endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
-
-
 #else /* IS_ENABLED(CONFIG_HMM) */
 static inline void hmm_mm_destroy(struct mm_struct *mm) {}
 static inline void hmm_mm_init(struct mm_struct *mm) {}
+#endif /* IS_ENABLED(CONFIG_HMM) */
 #endif /* LINUX_HMM_H */
-- 
2.14.3