X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=init%2FKconfig;h=fd664b3ab99ef79432643ab3e954943e759f81ca;hb=0a6b76dd23fa08c5fd7b68acdb55018a37afd4aa;hp=22320804fbafdc57b7228b68392199657a7c2f49;hpb=81f05fee8c063cfc1614ddba1ce88cb1129f263d;p=cascardo%2Flinux.git

diff --git a/init/Kconfig b/init/Kconfig
index 22320804fbaf..fd664b3ab99e 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