get_cycles from modular code in jitterentropy, was Re: [PATCH] clocksource: clint: Export clint_time_val for modules

From: Christoph Hellwig
Date: Fri Oct 02 2020 - 02:49:13 EST


On Tue, Sep 29, 2020 at 11:56:18PM -0700, Palmer Dabbelt wrote:
> clint_time_val will soon be used by the RISC-V implementation of
> random_get_entropy(), which is a static inline function that may be used by
> modules (at least CRYPTO_JITTERENTROPY=m).

At very least this needs to be an EXPORT_SYMBOL_GPL. But I really don't
think modules have any business using get_cycles, so I'd much rather
fix CRYPTO_JITTERENTROPY to be required to be build in.

>
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Signed-off-by: Palmer Dabbelt <palmerdabbelt@xxxxxxxxxx>
> ---
> drivers/clocksource/timer-clint.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/clocksource/timer-clint.c b/drivers/clocksource/timer-clint.c
> index d17367dee02c..6cfe2ab73eb0 100644
> --- a/drivers/clocksource/timer-clint.c
> +++ b/drivers/clocksource/timer-clint.c
> @@ -38,6 +38,7 @@ static unsigned int clint_timer_irq;
>
> #ifdef CONFIG_RISCV_M_MODE
> u64 __iomem *clint_time_val;
> +EXPORT_SYMBOL(clint_time_val);
> #endif
>
> static void clint_send_ipi(const struct cpumask *target)
> --
> 2.28.0.709.gb0816b6eb0-goog
>
>
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---end quoted text---