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| author | Dave Hansen <dave.hansen@linux.intel.com> | 2020-01-23 10:41:14 -0800 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@intel.com> | 2020-01-23 10:41:14 -0800 |
| commit | 4ba68d00055774308ede6c4c2133e5a8b70a2ab8 (patch) | |
| tree | 1a6238877297fa3b62001a624c84fa94c894a505 | |
| parent | 3a1255396b5aba40299d5dd5bde67b160a44117f (diff) | |
| download | linux-4ba68d00055774308ede6c4c2133e5a8b70a2ab8.tar.bz2 | |
x86/mpx: remove build infrastructure
From: Dave Hansen <dave.hansen@linux.intel.com>
MPX is being removed from the kernel due to a lack of support
in the toolchain going forward (gcc).
Remove the Kconfig option and the Makefile line. This makes
arch/x86/mm/mpx.c and anything under an #ifdef for
X86_INTEL_MPX dead code.
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: x86@kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
| -rw-r--r-- | arch/x86/Kconfig | 28 | ||||
| -rw-r--r-- | arch/x86/mm/Makefile | 1 |
2 files changed, 0 insertions, 29 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 8ef85139553f..1c25ca11236f 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1896,34 +1896,6 @@ config X86_INTEL_UMIP specific cases in protected and virtual-8086 modes. Emulated results are dummy. -config X86_INTEL_MPX - prompt "Intel MPX (Memory Protection Extensions)" - def_bool n - # Note: only available in 64-bit mode due to VMA flags shortage - depends on CPU_SUP_INTEL && X86_64 - select ARCH_USES_HIGH_VMA_FLAGS - ---help--- - MPX provides hardware features that can be used in - conjunction with compiler-instrumented code to check - memory references. It is designed to detect buffer - overflow or underflow bugs. - - This option enables running applications which are - instrumented or otherwise use MPX. It does not use MPX - itself inside the kernel or to protect the kernel - against bad memory references. - - Enabling this option will make the kernel larger: - ~8k of kernel text and 36 bytes of data on a 64-bit - defconfig. It adds a long to the 'mm_struct' which - will increase the kernel memory overhead of each - process and adds some branches to paths used during - exec() and munmap(). - - For details, see Documentation/x86/intel_mpx.rst - - If unsure, say N. - config X86_INTEL_MEMORY_PROTECTION_KEYS prompt "Intel Memory Protection Keys" def_bool y diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile index 84373dc9b341..236e57776ca6 100644 --- a/arch/x86/mm/Makefile +++ b/arch/x86/mm/Makefile @@ -45,7 +45,6 @@ obj-$(CONFIG_AMD_NUMA) += amdtopology.o obj-$(CONFIG_ACPI_NUMA) += srat.o obj-$(CONFIG_NUMA_EMU) += numa_emulation.o -obj-$(CONFIG_X86_INTEL_MPX) += mpx.o obj-$(CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS) += pkeys.o obj-$(CONFIG_RANDOMIZE_MEMORY) += kaslr.o obj-$(CONFIG_PAGE_TABLE_ISOLATION) += pti.o |