linux-kernel - [PATCH v4 8/9] crash_core: use VMCOREINFO_SYMBOL_ARRAY() for swapper_pg

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Message-Id: <c05f9781ec204f40fc96f95086e7b6de6a3eb2c3.1532563124.git.osandov@fb.com>
Date:   Wed, 25 Jul 2018 16:59:19 -0700
From:   Omar Sandoval <osandov@...ndov.com>
To:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Alexey Dobriyan <adobriyan@...il.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        James Morse <james.morse@....com>,
        Bhupesh Sharma <bhsharma@...hat.com>, kernel-team@...com
Subject: [PATCH v4 8/9] crash_core: use VMCOREINFO_SYMBOL_ARRAY() for swapper_pg_dir

From: Omar Sandoval <osandov@...com>

This is preparation for allowing CRASH_CORE to be enabled for any
architecture.

swapper_pg_dir is always either an array or a macro expanding to NULL.
In the latter case, VMCOREINFO_SYMBOL() won't work, as it tries to take
the address of the given symbol:

	#define VMCOREINFO_SYMBOL(name) \
		vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)

Instead, use VMCOREINFO_SYMBOL_ARRAY(), which uses the value:

	#define VMCOREINFO_SYMBOL_ARRAY(name) \
		vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)name)

This is the same thing for the array case but isn't an error for the
macro case.

Signed-off-by: Omar Sandoval <osandov@...com>
---
 kernel/crash_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index b66aced5e8c2..e7b4025c7b24 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -401,7 +401,7 @@ static int __init crash_save_vmcoreinfo_init(void)
 	VMCOREINFO_SYMBOL(init_uts_ns);
 	VMCOREINFO_SYMBOL(node_online_map);
 #ifdef CONFIG_MMU
-	VMCOREINFO_SYMBOL(swapper_pg_dir);
+	VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir);
 #endif
 	VMCOREINFO_SYMBOL(_stext);
 	VMCOREINFO_SYMBOL(vmap_area_list);
-- 
2.18.0