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Date: Tue, 07 May 2013 13:46:43 -0700 From: Dave Hansen <dave@...1.net> To: mmarek@...e.cz Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, Dave Hansen <dave@...1.net> Subject: [PATCH 1/7] consolidate per-arch stack overflow debugging options From: Dave Hansen <dave@...ux.vnet.ibm.com> Several architectures have similar stack debugging config options. They all pretty much do the same thing, some with slightly differing help text. This patch changes the architectures to instead enable a Kconfig boolean, and then use that boolean in the generic Kconfig.debug to present the actual menu option. This removes a bunch of duplication and adds consistency across arches. Signed-off-by: Dave Hansen <dave@...ux.vnet.ibm.com> Reviewed-by: H. Peter Anvin <hpa@...or.com> Reviewed-by: James Hogan <james.hogan@...tec.com> Acked-by: Chris Metcalf <cmetcalf@...era.com> [for tile] Signed-off-by: Dave Hansen <dave.hansen@...el.com> --- linux.git-davehans/arch/blackfin/Kconfig | 1 + linux.git-davehans/arch/blackfin/Kconfig.debug | 7 ------- linux.git-davehans/arch/frv/Kconfig | 1 + linux.git-davehans/arch/frv/Kconfig.debug | 4 ---- linux.git-davehans/arch/m32r/Kconfig | 1 + linux.git-davehans/arch/m32r/Kconfig.debug | 7 ------- linux.git-davehans/arch/mips/Kconfig | 1 + linux.git-davehans/arch/mips/Kconfig.debug | 9 --------- linux.git-davehans/arch/mn10300/Kconfig | 1 + linux.git-davehans/arch/mn10300/Kconfig.debug | 4 ---- linux.git-davehans/arch/powerpc/Kconfig | 1 + linux.git-davehans/arch/powerpc/Kconfig.debug | 7 ------- linux.git-davehans/arch/tile/Kconfig | 1 + linux.git-davehans/arch/tile/Kconfig.debug | 7 ------- linux.git-davehans/arch/x86/Kconfig | 1 + linux.git-davehans/arch/x86/Kconfig.debug | 10 ---------- linux.git-davehans/lib/Kconfig.debug | 21 +++++++++++++++++++++ 17 files changed, 29 insertions(+), 55 deletions(-) diff -puN arch/blackfin/Kconfig~consolidat-stack-debugging-configs arch/blackfin/Kconfig --- linux.git/arch/blackfin/Kconfig~consolidat-stack-debugging-configs 2013-05-07 13:41:36.964469362 -0700 +++ linux.git-davehans/arch/blackfin/Kconfig 2013-05-07 13:41:36.994470697 -0700 @@ -41,6 +41,7 @@ config BLACKFIN select ARCH_USES_GETTIMEOFFSET if !GENERIC_CLOCKEVENTS select HAVE_MOD_ARCH_SPECIFIC select MODULES_USE_ELF_RELA + select HAVE_DEBUG_STACKOVERFLOW config GENERIC_CSUM def_bool y diff -puN arch/blackfin/Kconfig.debug~consolidat-stack-debugging-configs arch/blackfin/Kconfig.debug --- linux.git/arch/blackfin/Kconfig.debug~consolidat-stack-debugging-configs 2013-05-07 13:41:36.966469449 -0700 +++ linux.git-davehans/arch/blackfin/Kconfig.debug 2013-05-07 13:41:36.994470697 -0700 @@ -2,13 +2,6 @@ menu "Kernel hacking" source "lib/Kconfig.debug" -config DEBUG_STACKOVERFLOW - bool "Check for stack overflows" - depends on DEBUG_KERNEL - help - This option will cause messages to be printed if free stack space - drops below a certain limit. - config DEBUG_VERBOSE bool "Verbose fault messages" default y diff -puN arch/frv/Kconfig~consolidat-stack-debugging-configs arch/frv/Kconfig --- linux.git/arch/frv/Kconfig~consolidat-stack-debugging-configs 2013-05-07 13:41:36.968469540 -0700 +++ linux.git-davehans/arch/frv/Kconfig 2013-05-07 13:41:36.995470740 -0700 @@ -14,6 +14,7 @@ config FRV select ARCH_WANT_IPC_PARSE_VERSION select OLD_SIGSUSPEND3 select OLD_SIGACTION + select HAVE_DEBUG_STACKOVERFLOW config ZONE_DMA bool diff -puN arch/frv/Kconfig.debug~consolidat-stack-debugging-configs arch/frv/Kconfig.debug --- linux.git/arch/frv/Kconfig.debug~consolidat-stack-debugging-configs 2013-05-07 13:41:36.969469585 -0700 +++ linux.git-davehans/arch/frv/Kconfig.debug 2013-05-07 13:41:36.995470740 -0700 @@ -2,10 +2,6 @@ menu "Kernel hacking" source "lib/Kconfig.debug" -config DEBUG_STACKOVERFLOW - bool "Check for stack overflows" - depends on DEBUG_KERNEL - config GDBSTUB bool "Remote GDB kernel debugging" depends on DEBUG_KERNEL diff -puN arch/m32r/Kconfig~consolidat-stack-debugging-configs arch/m32r/Kconfig --- linux.git/arch/m32r/Kconfig~consolidat-stack-debugging-configs 2013-05-07 13:41:36.971469672 -0700 +++ linux.git-davehans/arch/m32r/Kconfig 2013-05-07 13:41:36.996470784 -0700 @@ -16,6 +16,7 @@ config M32R select GENERIC_ATOMIC64 select ARCH_USES_GETTIMEOFFSET select MODULES_USE_ELF_RELA + select HAVE_DEBUG_STACKOVERFLOW config SBUS bool diff -puN arch/m32r/Kconfig.debug~consolidat-stack-debugging-configs arch/m32r/Kconfig.debug --- linux.git/arch/m32r/Kconfig.debug~consolidat-stack-debugging-configs 2013-05-07 13:41:36.972469716 -0700 +++ linux.git-davehans/arch/m32r/Kconfig.debug 2013-05-07 13:41:36.996470784 -0700 @@ -2,13 +2,6 @@ menu "Kernel hacking" source "lib/Kconfig.debug" -config DEBUG_STACKOVERFLOW - bool "Check for stack overflows" - depends on DEBUG_KERNEL - help - This option will cause messages to be printed if free stack space - drops below a certain limit. - config DEBUG_PAGEALLOC bool "Debug page memory allocations" depends on DEBUG_KERNEL && BROKEN diff -puN arch/mips/Kconfig~consolidat-stack-debugging-configs arch/mips/Kconfig --- linux.git/arch/mips/Kconfig~consolidat-stack-debugging-configs 2013-05-07 13:41:36.974469807 -0700 +++ linux.git-davehans/arch/mips/Kconfig 2013-05-07 13:41:36.997470829 -0700 @@ -42,6 +42,7 @@ config MIPS select MODULES_USE_ELF_REL if MODULES select MODULES_USE_ELF_RELA if MODULES && 64BIT select CLONE_BACKWARDS + select HAVE_DEBUG_STACKOVERFLOW menu "Machine selection" diff -puN arch/mips/Kconfig.debug~consolidat-stack-debugging-configs arch/mips/Kconfig.debug --- linux.git/arch/mips/Kconfig.debug~consolidat-stack-debugging-configs 2013-05-07 13:41:36.976469896 -0700 +++ linux.git-davehans/arch/mips/Kconfig.debug 2013-05-07 13:41:36.997470829 -0700 @@ -67,15 +67,6 @@ config CMDLINE_OVERRIDE Normally, you will choose 'N' here. -config DEBUG_STACKOVERFLOW - bool "Check for stack overflows" - depends on DEBUG_KERNEL - help - This option will cause messages to be printed if free stack space - drops below a certain limit(2GB on MIPS). The debugging option - provides another way to check stack overflow happened on kernel mode - stack usually caused by nested interruption. - config SMTC_IDLE_HOOK_DEBUG bool "Enable additional debug checks before going into CPU idle loop" depends on DEBUG_KERNEL && MIPS_MT_SMTC diff -puN arch/mn10300/Kconfig~consolidat-stack-debugging-configs arch/mn10300/Kconfig --- linux.git/arch/mn10300/Kconfig~consolidat-stack-debugging-configs 2013-05-07 13:41:36.977469939 -0700 +++ linux.git-davehans/arch/mn10300/Kconfig 2013-05-07 13:41:36.998470875 -0700 @@ -13,6 +13,7 @@ config MN10300 select MODULES_USE_ELF_RELA select OLD_SIGSUSPEND3 select OLD_SIGACTION + select HAVE_DEBUG_STACKOVERFLOW config AM33_2 def_bool n diff -puN arch/mn10300/Kconfig.debug~consolidat-stack-debugging-configs arch/mn10300/Kconfig.debug --- linux.git/arch/mn10300/Kconfig.debug~consolidat-stack-debugging-configs 2013-05-07 13:41:36.979470028 -0700 +++ linux.git-davehans/arch/mn10300/Kconfig.debug 2013-05-07 13:41:36.998470875 -0700 @@ -2,10 +2,6 @@ menu "Kernel hacking" source "lib/Kconfig.debug" -config DEBUG_STACKOVERFLOW - bool "Check for stack overflows" - depends on DEBUG_KERNEL - config DEBUG_DECOMPRESS_KERNEL bool "Using serial port during decompressing kernel" depends on DEBUG_KERNEL diff -puN arch/powerpc/Kconfig~consolidat-stack-debugging-configs arch/powerpc/Kconfig --- linux.git/arch/powerpc/Kconfig~consolidat-stack-debugging-configs 2013-05-07 13:41:36.980470074 -0700 +++ linux.git-davehans/arch/powerpc/Kconfig 2013-05-07 13:41:36.998470875 -0700 @@ -143,6 +143,7 @@ config PPC select ARCH_USE_BUILTIN_BSWAP select OLD_SIGSUSPEND select OLD_SIGACTION if PPC32 + select HAVE_DEBUG_STACKOVERFLOW config EARLY_PRINTK bool diff -puN arch/powerpc/Kconfig.debug~consolidat-stack-debugging-configs arch/powerpc/Kconfig.debug --- linux.git/arch/powerpc/Kconfig.debug~consolidat-stack-debugging-configs 2013-05-07 13:41:36.982470163 -0700 +++ linux.git-davehans/arch/powerpc/Kconfig.debug 2013-05-07 13:41:36.999470920 -0700 @@ -28,13 +28,6 @@ config PRINT_STACK_DEPTH too small and stack traces cause important information to scroll off the screen. -config DEBUG_STACKOVERFLOW - bool "Check for stack overflows" - depends on DEBUG_KERNEL - help - This option will cause messages to be printed if free stack space - drops below a certain limit. - config HCALL_STATS bool "Hypervisor call instrumentation" depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS diff -puN arch/tile/Kconfig~consolidat-stack-debugging-configs arch/tile/Kconfig --- linux.git/arch/tile/Kconfig~consolidat-stack-debugging-configs 2013-05-07 13:41:36.984470250 -0700 +++ linux.git-davehans/arch/tile/Kconfig 2013-05-07 13:41:36.999470920 -0700 @@ -25,6 +25,7 @@ config TILE select HAVE_ARCH_TRACEHOOK select HAVE_SYSCALL_TRACEPOINTS select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE + select HAVE_DEBUG_STACKOVERFLOW # FIXME: investigate whether we need/want these options. # select HAVE_IOREMAP_PROT diff -puN arch/tile/Kconfig.debug~consolidat-stack-debugging-configs arch/tile/Kconfig.debug --- linux.git/arch/tile/Kconfig.debug~consolidat-stack-debugging-configs 2013-05-07 13:41:36.985470295 -0700 +++ linux.git-davehans/arch/tile/Kconfig.debug 2013-05-07 13:41:37.000470964 -0700 @@ -14,13 +14,6 @@ config EARLY_PRINTK with klogd/syslogd. You should normally N here, unless you want to debug such a crash. -config DEBUG_STACKOVERFLOW - bool "Check for stack overflows" - depends on DEBUG_KERNEL - help - This option will cause messages to be printed if free stack space - drops below a certain limit. - config DEBUG_EXTRA_FLAGS string "Additional compiler arguments when building with '-g'" depends on DEBUG_INFO diff -puN arch/x86/Kconfig~consolidat-stack-debugging-configs arch/x86/Kconfig --- linux.git/arch/x86/Kconfig~consolidat-stack-debugging-configs 2013-05-07 13:41:36.987470386 -0700 +++ linux.git-davehans/arch/x86/Kconfig 2013-05-07 13:41:37.001471007 -0700 @@ -122,6 +122,7 @@ config X86 select OLD_SIGACTION if X86_32 select COMPAT_OLD_SIGACTION if IA32_EMULATION select RTC_LIB + select HAVE_DEBUG_STACKOVERFLOW config INSTRUCTION_DECODER def_bool y diff -puN arch/x86/Kconfig.debug~consolidat-stack-debugging-configs arch/x86/Kconfig.debug --- linux.git/arch/x86/Kconfig.debug~consolidat-stack-debugging-configs 2013-05-07 13:41:36.989470473 -0700 +++ linux.git-davehans/arch/x86/Kconfig.debug 2013-05-07 13:41:37.001471007 -0700 @@ -59,16 +59,6 @@ config EARLY_PRINTK_DBGP with klogd/syslogd or the X server. You should normally N here, unless you want to debug such a crash. You need usb debug device. -config DEBUG_STACKOVERFLOW - bool "Check for stack overflows" - depends on DEBUG_KERNEL - ---help--- - Say Y here if you want to check the overflows of kernel, IRQ - and exception stacks. This option will cause messages of the - stacks in detail when free stack space drops below a certain - limit. - If in doubt, say "N". - config X86_PTDUMP bool "Export kernel pagetable layout to userspace via debugfs" depends on DEBUG_KERNEL diff -puN lib/Kconfig.debug~consolidat-stack-debugging-configs lib/Kconfig.debug --- linux.git/lib/Kconfig.debug~consolidat-stack-debugging-configs 2013-05-07 13:41:36.991470562 -0700 +++ linux.git-davehans/lib/Kconfig.debug 2013-05-07 13:41:37.002471051 -0700 @@ -1475,6 +1475,27 @@ config ASYNC_RAID6_TEST If unsure, say N. +config HAVE_DEBUG_STACKOVERFLOW + bool + +config DEBUG_STACKOVERFLOW + bool "Check for stack overflows" + depends on DEBUG_KERNEL && HAVE_DEBUG_STACKOVERFLOW + ---help--- + Say Y here if you want to check for overflows of kernel, IRQ + and exception stacks (if your archicture uses them). This + option will show detailed messages if free stack space drops + below a certain limit. + + These kinds of bugs usually occur when call-chains in the + kernel get too deep, especially when interrupts are + involved. + + Use this in cases where you see apparently random memory + corruption, especially if it appears in 'struct thread_info' + + If in doubt, say "N". + source "samples/Kconfig" source "lib/Kconfig.kgdb" _ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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