kdump: write correct address of mem_section into vmcoreinfo

commit a0b1280368d1e91ab72f849ef095b4f07a39bbf1 upstream.

Depending on configuration mem_section can now be an array or a pointer
to an array allocated dynamically.  In most cases, we can continue to
refer to it as 'mem_section' regardless of what it is.

But there's one exception: '&mem_section' means "address of the array"
if mem_section is an array, but if mem_section is a pointer, it would
mean "address of the pointer".

We've stepped onto this in kdump code.  VMCOREINFO_SYMBOL(mem_section)
writes down address of pointer into vmcoreinfo, not array as we wanted.

Let's introduce VMCOREINFO_SYMBOL_ARRAY() that would handle the
situation correctly for both cases.

Link: http://lkml.kernel.org/r/20180112162532.35896-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Fixes: 83e3c48729d9 ("mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y")
Acked-by: Baoquan He <bhe@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Dave Young <dyoung@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
index 06097ef304491dc8f9743154c10f92d20165cb47..b511f6d24b42b0c4a2796bc33f494d86b7c7854b 100644 (file)
--- a/include/linux/crash_core.h
+++ b/include/linux/crash_core.h
@@ -42,6 +42,8 @@ phys_addr_t paddr_vmcoreinfo_note(void);
        vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
 #define VMCOREINFO_SYMBOL(name) \
        vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
+#define VMCOREINFO_SYMBOL_ARRAY(name) \
+       vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)name)
 #define VMCOREINFO_SIZE(name) \
        vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
                              (unsigned long)sizeof(name))

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index 6db80fc0810b9270b0cec3d7cfa2cf9b5a3413f1..2d90996dbe7715821bf5488fb7390c0d4e3177b2 100644 (file)
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -409,7 +409,7 @@ static int __init crash_save_vmcoreinfo_init(void)
        VMCOREINFO_SYMBOL(contig_page_data);
 #endif
 #ifdef CONFIG_SPARSEMEM
-       VMCOREINFO_SYMBOL(mem_section);
+       VMCOREINFO_SYMBOL_ARRAY(mem_section);
        VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
        VMCOREINFO_STRUCT_SIZE(mem_section);
        VMCOREINFO_OFFSET(mem_section, section_mem_map);