linux-kernel - [PATCH, net-next] vmcore: hide vmcoredd_mmap

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Message-Id: <20180525213526.2117790-1-arnd@arndb.de>
Date:   Fri, 25 May 2018 23:34:57 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Ganesh Goudar <ganeshgr@...lsio.com>,
        "David S. Miller" <davem@...emloft.net>,
        Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH, net-next] vmcore: hide vmcoredd_mmap_dumps() for nommu builds

Without CONFIG_MMU, we get a build warning:

fs/proc/vmcore.c:228:12: error: 'vmcoredd_mmap_dumps' defined but not used [-Werror=unused-function]
 static int vmcoredd_mmap_dumps(struct vm_area_struct *vma, unsigned long dst,

The function is only referenced from an #ifdef'ed caller, so
this uses the same #ifdef around it.

Fixes: 7efe48df8a3d ("vmcore: append device dumps to vmcore as elf notes")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 fs/proc/vmcore.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index cfb6674331fd..0651646dd04d 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -225,6 +225,7 @@ static int vmcoredd_copy_dumps(void *dst, u64 start, size_t size, int userbuf)
 	return ret;
 }
 
+#ifdef CONFIG_MMU
 static int vmcoredd_mmap_dumps(struct vm_area_struct *vma, unsigned long dst,
 			       u64 start, size_t size)
 {
@@ -259,6 +260,7 @@ static int vmcoredd_mmap_dumps(struct vm_area_struct *vma, unsigned long dst,
 	mutex_unlock(&vmcoredd_mutex);
 	return ret;
 }
+#endif /* CONFIG_MMU */
 #endif /* CONFIG_PROC_VMCORE_DEVICE_DUMP */
 
 /* Read from the ELF header and then the crash dump. On error, negative value is
-- 
2.9.0