Diffstat (limited to 'init/Kconfig')
1 files changed, 22 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index af4de4f1b02c..2d70c8c4b1d8 100644
@@ -1420,6 +1420,28 @@ config KALLSYMS_ALL
Say N unless you really need all symbols.
+ default X86_64 && SMP
+ depends on KALLSYMS
+ default !IA64 && !(TILE && 64BIT)
+ Instead of emitting them as absolute values in the native word size,
+ emit the symbol references in the kallsyms table as 32-bit entries,
+ each containing a relative value in the range [base, base + U32_MAX]
+ or, when KALLSYMS_ABSOLUTE_PERCPU is in effect, each containing either
+ an absolute value in the range [0, S32_MAX] or a relative value in the
+ range [base, base + S32_MAX], where base is the lowest relative symbol
+ address encountered in the image.
+ On 64-bit builds, this reduces the size of the address table by 50%,
+ but more importantly, it results in entries whose values are build
+ time constants, and no relocation pass is required at runtime to fix
+ up the entries based on the runtime load address of the kernel.
bool "Enable support for printk" if EXPERT