linux-kernel - [PATCH v2] coredump: fix compile warning when ELF

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Date:   Tue, 29 Nov 2022 07:32:29 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Ritesh Harjani <ritesh.list@...il.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] coredump: fix compile warning when ELF_CORE=n while COREDUMP=y

fix below build warning when ELF_CORE=n while COREDUMP=y:

fs/coredump.c:834:12: warning: ‘dump_emit_page’ defined but not used [-Wunused-function]
  834 | static int dump_emit_page(struct coredump_params *cprm, struct
      page *page)
      |            ^~~~~~~~~~~~~~

Fixes the warning by moving the definition of dump_emit_page() in the
same #ifdef as of dump_user_range(), since dump_user_range() is the only
caller of dump_emit_page().

Fixes: 06bbaa6dc53c ("[coredump] don't use __kernel_write() on kmap_local_page()")
Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
---
 fs/coredump.c | 48 ++++++++++++++++++++++++------------------------
 1 file changed, 24 insertions(+), 24 deletions(-)

Since v1:
 - add Fixes tag
 - collect Reviewed-by
 - fix the warning by moving the definition of dump_emit_page() in
   the same #ifdef as of dump_user_range().

diff --git a/fs/coredump.c b/fs/coredump.c
index 7bad7785e8e6..1fc8ecc0e8f6 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -831,6 +831,30 @@ 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 = {
@@ -864,30 +888,6 @@ 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)
 {
-- 
2.37.2