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| author | Sumanth Korikkar <sumanthk@linux.ibm.com> | 2024-04-25 17:59:31 +0300 |
|---|---|---|
| committer | Alexander Gordeev <agordeev@linux.ibm.com> | 2024-04-29 18:33:30 +0300 |
| commit | 00cda11d3b2ea07295490b7d67942014f1cbc5c1 (patch) | |
| tree | eb27959101e584b9ff882be1b4d5f8b09b864cb2 /arch/s390/Kconfig | |
| parent | 5f90003f09042b504d90ee38618cfd380ce16f4a (diff) | |
| download | linux-00cda11d3b2ea07295490b7d67942014f1cbc5c1.tar.xz | |
s390: Compile kernel with -fPIC and link with -no-pie
When the kernel is built with CONFIG_PIE_BUILD option enabled it
uses dynamic symbols, for which the linker does not allow more
than 64K number of entries. This can break features like kpatch.
Hence, whenever possible the kernel is built with CONFIG_PIE_BUILD
option disabled. For that support of unaligned symbols generated by
linker scripts in the compiler is necessary.
However, older compilers might lack such support. In that case the
build process resorts to CONFIG_PIE_BUILD option-enabled build.
Compile object files with -fPIC option and then link the kernel
binary with -no-pie linker option.
As result, the dynamic symbols are not generated and not only kpatch
feature succeeds, but also the whole CONFIG_PIE_BUILD option-enabled
code could be dropped.
[ agordeev: Reworded the commit message ]
Suggested-by: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index a077ded1b9e6..7e7fe89c9b25 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -593,18 +593,6 @@ config RELOCATABLE Note: this option exists only for documentation purposes, please do not remove it. -config PIE_BUILD - def_bool CC_IS_CLANG && !$(cc-option,-munaligned-symbols) - help - If the compiler is unable to generate code that can manage unaligned - symbols, the kernel is linked as a position-independent executable - (PIE) and includes dynamic relocations that are processed early - during bootup. - - For kpatch functionality, it is recommended to build the kernel - without the PIE_BUILD option. PIE_BUILD is only enabled when the - compiler lacks proper support for handling unaligned symbols. - config RANDOMIZE_BASE bool "Randomize the address of the kernel image (KASLR)" default y |