diff options
Diffstat (limited to 'init/Kconfig')
| -rw-r--r-- | init/Kconfig | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index af4de4f1b02c..2d70c8c4b1d8 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1420,6 +1420,28 @@ config KALLSYMS_ALL Say N unless you really need all symbols. +config KALLSYMS_ABSOLUTE_PERCPU + bool + default X86_64 && SMP + +config KALLSYMS_BASE_RELATIVE + bool + depends on KALLSYMS + default !IA64 && !(TILE && 64BIT) + help + 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. + config PRINTK default y bool "Enable support for printk" if EXPERT |