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Date: Fri, 11 Jan 2013 09:00:43 -0800 From: Dave Hansen <dave@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org Cc: linux-arch@...r.kernel.org, Dave Hansen <dave@...ux.vnet.ibm.com>, Mike Frysinger <vapier@...too.org>, David Howells <dhowells@...hat.com>, Hirokazu Takata <takata@...ux-m32r.org>, Ralf Baechle <ralf@...ux-mips.org>, Koichi Yasutake <yasutake.koichi@...panasonic.com>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, Chris Metcalf <cmetcalf@...era.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org, uclinux-dist-devel@...ckfin.uclinux.org Subject: [PATCH] consolidate per-arch stack overflow debugging options I'm looking for some Acked-bys on this from the various arch maintainers that it affects. I'd like to send it up to Linus in the next merge window. This is part of a larger series to clean up the "Kernel Hacking" menu: https://lkml.org/lkml/2012/12/17/306 -- 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> Cc: Mike Frysinger <vapier@...too.org> Cc: David Howells <dhowells@...hat.com> Cc: Hirokazu Takata <takata@...ux-m32r.org> Cc: Ralf Baechle <ralf@...ux-mips.org> Cc: Koichi Yasutake <yasutake.koichi@...panasonic.com> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org> Cc: Paul Mackerras <paulus@...ba.org> Cc: Chris Metcalf <cmetcalf@...era.com> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Ingo Molnar <mingo@...hat.com> Cc: H. Peter Anvin <hpa@...or.com> Cc: x86@...nel.org Cc: uclinux-dist-devel@...ckfin.uclinux.org --- linux-2.6.git-dave/arch/blackfin/Kconfig | 1 + linux-2.6.git-dave/arch/blackfin/Kconfig.debug | 7 ------- linux-2.6.git-dave/arch/frv/Kconfig | 1 + linux-2.6.git-dave/arch/frv/Kconfig.debug | 4 ---- linux-2.6.git-dave/arch/m32r/Kconfig | 1 + linux-2.6.git-dave/arch/m32r/Kconfig.debug | 7 ------- linux-2.6.git-dave/arch/mips/Kconfig | 1 + linux-2.6.git-dave/arch/mips/Kconfig.debug | 9 --------- linux-2.6.git-dave/arch/mn10300/Kconfig | 1 + linux-2.6.git-dave/arch/mn10300/Kconfig.debug | 4 ---- linux-2.6.git-dave/arch/powerpc/Kconfig | 1 + linux-2.6.git-dave/arch/powerpc/Kconfig.debug | 7 ------- linux-2.6.git-dave/arch/tile/Kconfig | 1 + linux-2.6.git-dave/arch/tile/Kconfig.debug | 7 ------- linux-2.6.git-dave/arch/x86/Kconfig | 1 + linux-2.6.git-dave/arch/x86/Kconfig.debug | 10 ---------- linux-2.6.git-dave/lib/Kconfig.debug | 21 +++++++++++++++++++++ 17 files changed, 29 insertions(+), 55 deletions(-) diff -puN arch/blackfin/Kconfig~consolidat-stack-debugging-configs arch/blackfin/Kconfig --- linux-2.6.git/arch/blackfin/Kconfig~consolidat-stack-debugging-configs 2013-01-11 08:05:18.902335435 -0800 +++ linux-2.6.git-dave/arch/blackfin/Kconfig 2013-01-11 08:05:18.942335775 -0800 @@ -45,6 +45,7 @@ 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-2.6.git/arch/blackfin/Kconfig.debug~consolidat-stack-debugging-configs 2013-01-11 08:05:18.902335435 -0800 +++ linux-2.6.git-dave/arch/blackfin/Kconfig.debug 2013-01-11 08:05:18.942335775 -0800 @@ -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-2.6.git/arch/frv/Kconfig~consolidat-stack-debugging-configs 2013-01-11 08:05:18.906335469 -0800 +++ linux-2.6.git-dave/arch/frv/Kconfig 2013-01-11 08:05:18.942335775 -0800 @@ -12,6 +12,7 @@ config FRV select ARCH_HAVE_NMI_SAFE_CMPXCHG select GENERIC_CPU_DEVICES select ARCH_WANT_IPC_PARSE_VERSION + select HAVE_DEBUG_STACKOVERFLOW config ZONE_DMA bool diff -puN arch/frv/Kconfig.debug~consolidat-stack-debugging-configs arch/frv/Kconfig.debug --- linux-2.6.git/arch/frv/Kconfig.debug~consolidat-stack-debugging-configs 2013-01-11 08:05:18.906335469 -0800 +++ linux-2.6.git-dave/arch/frv/Kconfig.debug 2013-01-11 08:05:18.942335775 -0800 @@ -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-2.6.git/arch/m32r/Kconfig~consolidat-stack-debugging-configs 2013-01-11 08:05:18.910335503 -0800 +++ linux-2.6.git-dave/arch/m32r/Kconfig 2013-01-11 08:05:18.942335775 -0800 @@ -15,6 +15,7 @@ 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-2.6.git/arch/m32r/Kconfig.debug~consolidat-stack-debugging-configs 2013-01-11 08:05:18.914335537 -0800 +++ linux-2.6.git-dave/arch/m32r/Kconfig.debug 2013-01-11 08:05:18.942335775 -0800 @@ -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-2.6.git/arch/mips/Kconfig~consolidat-stack-debugging-configs 2013-01-11 08:05:18.914335537 -0800 +++ linux-2.6.git-dave/arch/mips/Kconfig 2013-01-11 08:05:18.942335775 -0800 @@ -41,6 +41,7 @@ config MIPS select HAVE_MOD_ARCH_SPECIFIC select MODULES_USE_ELF_REL if MODULES select MODULES_USE_ELF_RELA if MODULES && 64BIT + select HAVE_DEBUG_STACKOVERFLOW menu "Machine selection" diff -puN arch/mips/Kconfig.debug~consolidat-stack-debugging-configs arch/mips/Kconfig.debug --- linux-2.6.git/arch/mips/Kconfig.debug~consolidat-stack-debugging-configs 2013-01-11 08:05:18.918335571 -0800 +++ linux-2.6.git-dave/arch/mips/Kconfig.debug 2013-01-11 08:05:18.942335775 -0800 @@ -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-2.6.git/arch/mn10300/Kconfig~consolidat-stack-debugging-configs 2013-01-11 08:05:18.918335571 -0800 +++ linux-2.6.git-dave/arch/mn10300/Kconfig 2013-01-11 08:05:18.942335775 -0800 @@ -9,6 +9,7 @@ config MN10300 select HAVE_NMI_WATCHDOG if MN10300_WD_TIMER select GENERIC_CLOCKEVENTS select MODULES_USE_ELF_RELA + 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-2.6.git/arch/mn10300/Kconfig.debug~consolidat-stack-debugging-configs 2013-01-11 08:05:18.922335605 -0800 +++ linux-2.6.git-dave/arch/mn10300/Kconfig.debug 2013-01-11 08:05:18.942335775 -0800 @@ -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-2.6.git/arch/powerpc/Kconfig~consolidat-stack-debugging-configs 2013-01-11 08:05:18.922335605 -0800 +++ linux-2.6.git-dave/arch/powerpc/Kconfig 2013-01-11 08:05:18.946335809 -0800 @@ -144,6 +144,7 @@ config PPC select HAVE_MOD_ARCH_SPECIFIC select MODULES_USE_ELF_RELA select CLONE_BACKWARDS + select HAVE_DEBUG_STACKOVERFLOW config EARLY_PRINTK bool diff -puN arch/powerpc/Kconfig.debug~consolidat-stack-debugging-configs arch/powerpc/Kconfig.debug --- linux-2.6.git/arch/powerpc/Kconfig.debug~consolidat-stack-debugging-configs 2013-01-11 08:05:18.926335639 -0800 +++ linux-2.6.git-dave/arch/powerpc/Kconfig.debug 2013-01-11 08:05:18.946335809 -0800 @@ -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-2.6.git/arch/tile/Kconfig~consolidat-stack-debugging-configs 2013-01-11 08:05:18.930335673 -0800 +++ linux-2.6.git-dave/arch/tile/Kconfig 2013-01-11 08:05:18.946335809 -0800 @@ -21,6 +21,7 @@ config TILE select ARCH_HAVE_NMI_SAFE_CMPXCHG select GENERIC_CLOCKEVENTS select MODULES_USE_ELF_RELA + 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-2.6.git/arch/tile/Kconfig.debug~consolidat-stack-debugging-configs 2013-01-11 08:05:18.930335673 -0800 +++ linux-2.6.git-dave/arch/tile/Kconfig.debug 2013-01-11 08:05:18.946335809 -0800 @@ -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-2.6.git/arch/x86/Kconfig~consolidat-stack-debugging-configs 2013-01-11 08:05:18.934335707 -0800 +++ linux-2.6.git-dave/arch/x86/Kconfig 2013-01-11 08:05:18.946335809 -0800 @@ -114,6 +114,7 @@ config X86 select MODULES_USE_ELF_RELA if X86_64 select CLONE_BACKWARDS if X86_32 select GENERIC_SIGALTSTACK + 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-2.6.git/arch/x86/Kconfig.debug~consolidat-stack-debugging-configs 2013-01-11 08:05:18.934335707 -0800 +++ linux-2.6.git-dave/arch/x86/Kconfig.debug 2013-01-11 08:05:18.946335809 -0800 @@ -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-2.6.git/lib/Kconfig.debug~consolidat-stack-debugging-configs 2013-01-11 08:05:18.938335741 -0800 +++ linux-2.6.git-dave/lib/Kconfig.debug 2013-01-11 08:05:18.946335809 -0800 @@ -1441,6 +1441,27 @@ 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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