From f091d5a426447cc427680bdd3adc7773aa2867df Mon Sep 17 00:00:00 2001 From: Eugeniy Paltsev Date: Fri, 8 Nov 2019 19:20:22 +0300 Subject: ARC: ARCv2: jump label: implement jump label patching Implement jump label patching for ARC. Jump labels provide an interface to generate dynamic branches using self-modifying code. This allows us to implement conditional branches where changing branch direction is expensive but branch selection is basically 'free' This implementation uses 32-bit NOP and BRANCH instructions which forced to be aligned by 4 to guarantee that they don't cross L1 cache line boundary and can be update atomically. Signed-off-by: Eugeniy Paltsev Signed-off-by: Vineet Gupta --- arch/arc/Kconfig | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'arch/arc/Kconfig') diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 8383155c8c82..375f9d278139 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -46,6 +46,7 @@ config ARC select OF_EARLY_FLATTREE select PCI_SYSCALL if PCI select PERF_USE_VMALLOC if ARC_CACHE_VIPT_ALIASING + select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32 config ARCH_HAS_CACHE_LINE_SIZE def_bool y @@ -525,6 +526,13 @@ config ARC_DW2_UNWIND config ARC_DBG_TLB_PARANOIA bool "Paranoia Checks in Low Level TLB Handlers" +config ARC_DBG_JUMP_LABEL + bool "Paranoid checks in Static Keys (jump labels) code" + depends on JUMP_LABEL + default y if STATIC_KEYS_SELFTEST + help + Enable paranoid checks and self-test of both ARC-specific and generic + part of static keys (jump labels) related code. endif config ARC_BUILTIN_DTB_NAME -- cgit v1.2.3 From 9fbea0b7e842890a76acffce9be9e430b9e11194 Mon Sep 17 00:00:00 2001 From: Eugeniy Paltsev Date: Tue, 19 Nov 2019 18:26:15 +0300 Subject: ARC: add kmemleak support kmemleak is used internally for a long time and as there isn't any issue with it we can finally enable it in upstream. Signed-off-by: Eugeniy Paltsev Signed-off-by: Vineet Gupta --- arch/arc/Kconfig | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/arc/Kconfig') diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 375f9d278139..a00a1d46cf01 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -30,6 +30,7 @@ config ARC select HAVE_ARCH_KGDB select HAVE_ARCH_TRACEHOOK select HAVE_DEBUG_STACKOVERFLOW + select HAVE_DEBUG_KMEMLEAK select HAVE_FUTEX_CMPXCHG if FUTEX select HAVE_IOREMAP_PROT select HAVE_KERNEL_GZIP -- cgit v1.2.3