From c885df50f571faf9fd9f395361cfff1b3a16e06e Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Sun, 7 Sep 2008 02:37:32 -0700 Subject: [PATCH] x86: default corruption check to off, but put parameter default in Kconfig Default the low memory corruption check to off, but make the default setting of the memory_corruption_check kernel parameter a config parameter. Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Ingo Molnar --- arch/x86/Kconfig | 9 ++++++++- arch/x86/kernel/setup.c | 13 ++++++++++++- 2 files changed, 20 insertions(+), 2 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index cbee4199689..7820d447bb8 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1061,7 +1061,6 @@ config HIGHPTE config X86_CHECK_BIOS_CORRUPTION bool "Check for low memory corruption" - default y help Periodically check for memory corruption in low memory, which is suspected to be caused by BIOS. Even when enabled in the @@ -1082,6 +1081,14 @@ config X86_CHECK_BIOS_CORRUPTION you can use memmap= to prevent the kernel from using that memory. +config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK + bool "Set the default setting of memory_corruption_check" + depends on X86_CHECK_BIOS_CORRUPTION + default y + help + Set whether the default state of memory_corruption_check is + on or off. + config MATH_EMULATION bool prompt "Math emulation" if X86_32 diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 27ae9128885..ec7e56c1b98 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -587,7 +587,8 @@ struct x86_quirks *x86_quirks __initdata = &default_x86_quirks; #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION #define MAX_SCAN_AREAS 8 -static int __read_mostly memory_corruption_check = 0; +static int __read_mostly memory_corruption_check = -1; + static unsigned __read_mostly corruption_check_size = 64*1024; static unsigned __read_mostly corruption_check_period = 60; /* seconds */ @@ -634,6 +635,16 @@ static void __init setup_bios_corruption_check(void) { u64 addr = PAGE_SIZE; /* assume first page is reserved anyway */ + if (memory_corruption_check == -1) { + memory_corruption_check = +#ifdef CONFIG_X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK + 1 +#else + 0 +#endif + ; + } + if (corruption_check_size == 0) memory_corruption_check = 0; -- 2.41.0