# \[PATCH\] powerpc/8xx: Force VIRT\_IMMR\_BASE to be a positive number - Subsystems: LINUX FOR POWERPC (32-BIT AND 64-BIT), THE REST - Maintainers: Madhavan Srinivasan, Linus Torvalds - List: linuxppc-dev - 1 message, 1 author - Page: https://ratatoskr.run/linuxppc-dev/2016/07/9491080/t ## \[PATCH\] powerpc/8xx: Force VIRT\_IMMR\_BASE to be a positive number - From: Scott Wood \ - Date: 2016-07-09 08:28:49 - Message: https://ratatoskr.run/linuxppc-dev/2016/07/9491080.md ```text The asm-offsets mechanism generates signed numbers, even if the input value is explicitly unsigned. This causes a problem with older binutils (e.g. 2.23), which sign-extend a negative number when @h is applied. Thus, this instruction: cmpli cr0, r11, VIRT_IMMR_BASE@h resulted in this: Error: operand out of range (0xfffffff0 is not between 0x00000000 and 0x0000ffff) By casting to a larger type, we can force the output to be expressed as a positive number. Signed-off-by: Scott Wood Cc: Christophe Leroy --- arch/powerpc/kernel/asm-offsets.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 247f640..b89d14c 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -754,7 +754,7 @@ int main(void) DEFINE(PPC_DBELL_SERVER, PPC_DBELL_SERVER); #ifdef CONFIG_PPC_8xx - DEFINE(VIRT_IMMR_BASE, __fix_to_virt(FIX_IMMR_BASE)); + DEFINE(VIRT_IMMR_BASE, (u64)__fix_to_virt(FIX_IMMR_BASE)); #endif return 0; -- 2.7.4 ```