diff options
| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2019-02-03 21:35:45 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2019-04-29 10:47:10 +0200 |
| commit | 805bc0bc238f7209fca5e39c152b0d3c12046ac9 (patch) | |
| tree | 97edfcee4981bc71c2e6a9dc853353010ac4fa94 /arch/s390/Kconfig | |
| parent | 833b441ec0f6f3c57cc2106ef628bb19d8fb0ee2 (diff) | |
s390/kernel: build a relocatable kernel
This patch adds support for building a relocatable kernel with -fPIE.
The kernel will be relocated to 0 early in the boot process.
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Reviewed-by: Philipp Rudo <prudo@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 21e851b0a989..4c99e4f5f366 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -624,6 +624,19 @@ config EXPOLINE_FULL endchoice +config RELOCATABLE + bool "Build a relocatable kernel" + select MODULE_REL_CRCS if MODVERSIONS + default y + help + This builds a kernel image that retains relocation information + so it can be loaded at an arbitrary address. + The kernel is linked as a position-independent executable (PIE) + and contains dynamic relocations which are processed early in the + bootup process. + The relocations make the kernel image about 15% larger (compressed + 10%), but are discarded at runtime. + endmenu menu "Memory setup" |