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Message-Id: <20121214184202.F54094D9@kernel.stglabs.ibm.com> Date: Fri, 14 Dec 2012 13:42:02 -0500 From: Dave Hansen <dave@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org Cc: Dave Hansen <dave@...ux.vnet.ibm.com> Subject: [RFC][PATCH 2/7] consolidate per-arch stack overflow debugging options 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. Signed-off-by: Dave Hansen <dave@...ux.vnet.ibm.com> --- 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 2012-12-10 11:26:13.963147904 -0500 +++ linux-2.6.git-dave/arch/blackfin/Kconfig 2012-12-10 11:26:13.999148224 -0500 @@ -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 2012-12-10 11:26:13.963147904 -0500 +++ linux-2.6.git-dave/arch/blackfin/Kconfig.debug 2012-12-10 11:26:13.999148224 -0500 @@ -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 2012-12-10 11:26:13.967147938 -0500 +++ linux-2.6.git-dave/arch/frv/Kconfig 2012-12-10 11:26:13.999148224 -0500 @@ -14,6 +14,7 @@ config FRV select ARCH_WANT_IPC_PARSE_VERSION select GENERIC_KERNEL_THREAD select GENERIC_KERNEL_EXECVE + 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 2012-12-10 11:26:13.967147938 -0500 +++ linux-2.6.git-dave/arch/frv/Kconfig.debug 2012-12-10 11:26:13.999148224 -0500 @@ -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 2012-12-10 11:26:13.971147973 -0500 +++ linux-2.6.git-dave/arch/m32r/Kconfig 2012-12-10 11:26:13.999148224 -0500 @@ -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 2012-12-10 11:26:13.971147973 -0500 +++ linux-2.6.git-dave/arch/m32r/Kconfig.debug 2012-12-10 11:26:13.999148224 -0500 @@ -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 2012-12-10 11:26:13.975148010 -0500 +++ linux-2.6.git-dave/arch/mips/Kconfig 2012-12-10 11:26:13.999148224 -0500 @@ -40,6 +40,7 @@ config MIPS select HAVE_MOD_ARCH_SPECIFIC select MODULES_USE_ELF_REL select MODULES_USE_ELF_RELA if 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 2012-12-10 11:26:13.975148010 -0500 +++ linux-2.6.git-dave/arch/mips/Kconfig.debug 2012-12-10 11:26:13.999148224 -0500 @@ -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 2012-12-10 11:26:13.979148046 -0500 +++ linux-2.6.git-dave/arch/mn10300/Kconfig 2012-12-10 11:26:13.999148224 -0500 @@ -10,6 +10,7 @@ config MN10300 select GENERIC_CLOCKEVENTS select GENERIC_KERNEL_THREAD 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 2012-12-10 11:26:13.979148046 -0500 +++ linux-2.6.git-dave/arch/mn10300/Kconfig.debug 2012-12-10 11:26:13.999148224 -0500 @@ -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 2012-12-10 11:26:13.983148082 -0500 +++ linux-2.6.git-dave/arch/powerpc/Kconfig 2012-12-10 11:26:59.899558241 -0500 @@ -144,6 +144,7 @@ config PPC select GENERIC_KERNEL_THREAD select HAVE_MOD_ARCH_SPECIFIC select MODULES_USE_ELF_RELA + 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 2012-12-10 11:26:13.983148082 -0500 +++ linux-2.6.git-dave/arch/powerpc/Kconfig.debug 2012-12-10 11:26:13.999148224 -0500 @@ -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 2012-12-10 11:26:13.987148118 -0500 +++ linux-2.6.git-dave/arch/tile/Kconfig 2012-12-10 11:27:06.835620193 -0500 @@ -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 2012-12-10 11:26:13.987148118 -0500 +++ linux-2.6.git-dave/arch/tile/Kconfig.debug 2012-12-10 11:26:14.003148261 -0500 @@ -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 2012-12-10 11:26:13.991148152 -0500 +++ linux-2.6.git-dave/arch/x86/Kconfig 2012-12-10 11:27:31.911844173 -0500 @@ -112,6 +112,7 @@ config X86 select GENERIC_KERNEL_EXECVE select MODULES_USE_ELF_REL if X86_32 select MODULES_USE_ELF_RELA if X86_64 + 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 2012-12-10 11:26:13.991148152 -0500 +++ linux-2.6.git-dave/arch/x86/Kconfig.debug 2012-12-10 11:28:38.856442056 -0500 @@ -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 2012-12-10 11:26:13.995148187 -0500 +++ linux-2.6.git-dave/lib/Kconfig.debug 2012-12-10 11:28:38.856442056 -0500 @@ -1464,6 +1464,27 @@ 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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