6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Qi Xi <xiqi2@xxxxxxxxxx>
commit b8ee299855f08539e04d6c1a6acb3dc9e5423c00 upstream.
When build with !CONFIG_MMU, the variable 'vmcore_mmap_ops'
is defined but not used:
>> fs/proc/vmcore.c:458:42: warning: unused variable 'vmcore_mmap_ops'
458 | static const struct vm_operations_struct vmcore_mmap_ops = {
Fix this by only defining it when CONFIG_MMU is enabled.
Link: https://lkml.kernel.org/r/20241101034803.9298-1-xiqi2@xxxxxxxxxx
Fixes: 9cb218131de1 ("vmcore: introduce remap_oldmem_pfn_range()")
Signed-off-by: Qi Xi <xiqi2@xxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/lkml/202410301936.GcE8yUos-lkp@xxxxxxxxx/
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Cc: Wang ShaoBo <bobo.shaobowang@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/proc/vmcore.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -457,10 +457,6 @@ static vm_fault_t mmap_vmcore_fault(stru
#endif
}
-static const struct vm_operations_struct vmcore_mmap_ops = {
- .fault = mmap_vmcore_fault,
-};
-
/**
* vmcore_alloc_buf - allocate buffer in vmalloc memory
* @size: size of buffer
@@ -488,6 +484,11 @@ static inline char *vmcore_alloc_buf(siz
* virtually contiguous user-space in ELF layout.
*/
#ifdef CONFIG_MMU
+
+static const struct vm_operations_struct vmcore_mmap_ops = {
+ .fault = mmap_vmcore_fault,
+};
+
/*
* remap_oldmem_pfn_checked - do remap_oldmem_pfn_range replacing all pages
* reported as not being ram with the zero page.
