From mboxrd@z Thu Jan 1 00:00:00 1970 From: cyril@ti.com (Cyril Chemparathy) Date: Fri, 21 Sep 2012 18:25:28 -0400 Subject: [PATCH v3 02/17] ARM: add self test for runtime patch mechanism In-Reply-To: References: <1347385155-11643-1-git-send-email-cyril@ti.com> <1347385155-11643-3-git-send-email-cyril@ti.com> Message-ID: <505CE958.5020808@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 9/21/2012 1:40 PM, Nicolas Pitre wrote: > On Tue, 11 Sep 2012, Cyril Chemparathy wrote: > >> This patch adds basic sanity tests to ensure that the instruction patching >> results in valid instruction encodings. This is done by verifying the output >> of the patch process against a vector of assembler generated instructions at >> init time. >> >> Signed-off-by: Cyril Chemparathy >> --- >> arch/arm/Kconfig | 12 +++++++ >> arch/arm/kernel/runtime-patch.c | 75 +++++++++++++++++++++++++++++++++++++++ >> 2 files changed, 87 insertions(+) >> >> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig >> index 36de4ea..bfcd29d 100644 >> --- a/arch/arm/Kconfig >> +++ b/arch/arm/Kconfig >> @@ -207,6 +207,18 @@ config ARM_PATCH_PHYS_VIRT >> this feature (eg, building a kernel for a single machine) and >> you need to shrink the kernel to the minimal size. >> >> +config ARM_RUNTIME_PATCH_TEST >> + bool "Self test runtime patching mechanism" if ARM_RUNTIME_PATCH >> + default y > > Here you probably want this instead: > > bool "Self test runtime patching mechanism" > default y > depends on ARM_RUNTIME_PATCH > > Otherwise ARM_RUNTIME_PATCH_TEST will be forced to y whenever > ARM_RUNTIME_PATCH is unset. That doesn't currently affect the build > since the containing .c file is only compiled when ARM_RUNTIME_PATCH is > set but that is still not strictly right. > Indeed. Excellent. Thanks. > [...] >> @@ -189,5 +261,8 @@ void __init runtime_patch_kernel(void) >> const void *start = &__runtime_patch_table_begin; >> const void *end = &__runtime_patch_table_end; >> >> +#ifdef CONFIG_ARM_RUNTIME_PATCH_TEST >> + runtime_patch_test(); >> +#endif >> BUG_ON(runtime_patch(start, end - start)); > > I think you shoulld have runtime_patch_test() return a possible error > code and use BUG_ON() with it as well. > Sure. Will do in v4. > With those minor changes you can add... > > Reviewed-by: Nicolas Pitre > Thanks. -- - Cyril