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-rw-r--r--init/Kconfig18
1 files changed, 18 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index b17824a875fa..fd664b3ab99e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1424,6 +1424,24 @@ 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
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