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From:   Ren Zhijie <renzhijie2@huawei.com>
To:     <viro@zeniv.linux.org.uk>
CC:     <linux-fsdevel@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        Ren Zhijie <renzhijie2@huawei.com>
Subject: [PATCH -next] coredump: fix unused-function warning
Date:   Sun, 9 Oct 2022 09:24:20 +0000
Message-ID: <20221009092420.32850-1-renzhijie2@huawei.com>
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Precedence: bulk

If CONFIG_ELF_CORE is not set,
gcc warns about unused function:

fs/coredump.c:839:12: error: ‘dump_emit_page’ defined but not used [-Werror=unused-function]
 static int dump_emit_page(struct coredump_params *cprm, struct page *page)
            ^~~~~~~~~~~~~~
cc1: all warnings being treated as errors

dump_emit_page() only be called by dump_user_range(),
so move it under the CONFIG_ELF_CORE.

Fixes: 06bbaa6dc53c ("[coredump] don't use __kernel_write() on kmap_local_page()")
Signed-off-by: Ren Zhijie <renzhijie2@huawei.com>
---
 fs/coredump.c | 48 ++++++++++++++++++++++++------------------------
 1 file changed, 24 insertions(+), 24 deletions(-)

diff --git a/fs/coredump.c b/fs/coredump.c
index 3e8630c8d627..dc1cb8440bc9 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -836,6 +836,30 @@ static int __dump_skip(struct coredump_params *cprm, size_t nr)
 	}
 }
 
+int dump_emit(struct coredump_params *cprm, const void *addr, int nr)
+{
+	if (cprm->to_skip) {
+		if (!__dump_skip(cprm, cprm->to_skip))
+			return 0;
+		cprm->to_skip = 0;
+	}
+	return __dump_emit(cprm, addr, nr);
+}
+EXPORT_SYMBOL(dump_emit);
+
+void dump_skip_to(struct coredump_params *cprm, unsigned long pos)
+{
+	cprm->to_skip = pos - cprm->pos;
+}
+EXPORT_SYMBOL(dump_skip_to);
+
+void dump_skip(struct coredump_params *cprm, size_t nr)
+{
+	cprm->to_skip += nr;
+}
+EXPORT_SYMBOL(dump_skip);
+
+#ifdef CONFIG_ELF_CORE
 static int dump_emit_page(struct coredump_params *cprm, struct page *page)
 {
 	struct bio_vec bvec = {
@@ -869,30 +893,6 @@ static int dump_emit_page(struct coredump_params *cprm, struct page *page)
 	return 1;
 }
 
-int dump_emit(struct coredump_params *cprm, const void *addr, int nr)
-{
-	if (cprm->to_skip) {
-		if (!__dump_skip(cprm, cprm->to_skip))
-			return 0;
-		cprm->to_skip = 0;
-	}
-	return __dump_emit(cprm, addr, nr);
-}
-EXPORT_SYMBOL(dump_emit);
-
-void dump_skip_to(struct coredump_params *cprm, unsigned long pos)
-{
-	cprm->to_skip = pos - cprm->pos;
-}
-EXPORT_SYMBOL(dump_skip_to);
-
-void dump_skip(struct coredump_params *cprm, size_t nr)
-{
-	cprm->to_skip += nr;
-}
-EXPORT_SYMBOL(dump_skip);
-
-#ifdef CONFIG_ELF_CORE
 int dump_user_range(struct coredump_params *cprm, unsigned long start,
 		    unsigned long len)
 {
-- 
2.17.1