linux-kernel - [PATCH] coredump: move dump_emit_page() into CONFIG_ELF

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Date:   Thu, 15 Dec 2022 17:44:02 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Alexander Viro <viro@...iv.linux.org.uk>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Xiaoming Ni <nixiaoming@...wei.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] coredump: move dump_emit_page() into CONFIG_ELF_CORE check

From: Arnd Bergmann <arnd@...db.de>

If CONFIG_ELF_CORE is disabled, dump_emit_page() is unused, which
causes a warning:

fs/coredump.c:834:12: error: 'dump_emit_page' defined but not used [-Werror=unused-function]

There is only one caller, so move the definition next to it.

Fixes: 06bbaa6dc53c ("[coredump] don't use __kernel_write() on kmap_local_page()")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 fs/coredump.c | 48 ++++++++++++++++++++++++------------------------
 1 file changed, 24 insertions(+), 24 deletions(-)

diff --git a/fs/coredump.c b/fs/coredump.c
index de78bde2991b..a25ecec9ca7c 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -838,6 +838,30 @@ 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 = {
@@ -871,30 +895,6 @@ 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)
 {
-- 
2.35.1