Builds kernel with "make bzImage EXTRA_CFLAGS=-Wall", gcc complains:
arch/x86/boot/compressed/pgtable_64.c: In function 'paging_prepare':
arch/x86/boot/compressed/pgtable_64.c:92:7: warning: 'new' may be used
uninitialized in this function [-Wmaybe-uninitialized]
new = round_down(new, PAGE_SIZE);
In theory a random value of variable new may pass all the check and be
assigned to bios_start, fixing it by assigning it an initial value.
Fixes: 0a46fff2f910 ("x86/boot/compressed/64: Fix boot on machines with broken
E820 table")
Signed-off-by: Zhenzhong Duan <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: x86-ml <[email protected]>
---
arch/x86/boot/compressed/pgtable_64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/boot/compressed/pgtable_64.c
b/arch/x86/boot/compressed/pgtable_64.c
index 2faddeb..c886269 100644
--- a/arch/x86/boot/compressed/pgtable_64.c
+++ b/arch/x86/boot/compressed/pgtable_64.c
@@ -72,7 +72,7 @@ static unsigned long find_trampoline_placement(void)
/* Find the first usable memory region under bios_start. */
for (i = boot_params->e820_entries - 1; i >= 0; i--) {
- unsigned long new;
+ unsigned long new = bios_start;
entry = &boot_params->e820_table[i];
--
1.8.3.1
