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 <[email protected]>
> ---
> 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.
[...]
> @@ -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.
With those minor changes you can add...
Reviewed-by: Nicolas Pitre <[email protected]>
Nicolas
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