From: Shaohua Li Date: Tue, 18 Jan 2011 00:57:49 +0000 (+0800) Subject: x86: Make relocatable kernel work with new binutils X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=86b1e8dd83cbb0fcbf3d61d2b461df8be1f528cf;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git x86: Make relocatable kernel work with new binutils The CONFIG_RELOCATABLE=y option is broken with new binutils, which will make boot panic. According to Lu Hongjiu, the affected binutils are from 2.20.51.0.12 to 2.21.51.0.3, which are release since Oct 22 this year. At least ubuntu 10.10 is using such binutils. See: http://sourceware.org/bugzilla/show_bug.cgi?id=12327 The reason of the boot panic is that we have 'jiffies = jiffies_64;' in vmlinux.lds.S. The jiffies isn't in any section. In kernel build, there is warning saying jiffies is an absolute address and can't be relocatable. At runtime, jiffies will have virtual address 0. Signed-off-by: Shaohua Li Cc: Lu Hongjiu Cc: Huang Ying Cc: Sam Ravnborg LKML-Reference: <1295312269.1949.725.camel@sli10-conroe> Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index bf4700755184..b34ab80fddd5 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -34,11 +34,9 @@ OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT) #ifdef CONFIG_X86_32 OUTPUT_ARCH(i386) ENTRY(phys_startup_32) -jiffies = jiffies_64; #else OUTPUT_ARCH(i386:x86-64) ENTRY(phys_startup_64) -jiffies_64 = jiffies; #endif #if defined(CONFIG_X86_64) && defined(CONFIG_DEBUG_RODATA) @@ -142,6 +140,15 @@ SECTIONS CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES) DATA_DATA + /* + * Workaround a binutils (2.20.51.0.12 to 2.21.51.0.3) bug. + * This makes jiffies relocatable in such binutils + */ +#ifdef CONFIG_X86_32 + jiffies = jiffies_64; +#else + jiffies_64 = jiffies; +#endif CONSTRUCTORS /* rarely changed data like cpu maps */