[PATCH master 1/3] RISC-V: cpu: request stack memory region

[Sascha Hauer]

On Wed, Mar 24, 2021 at 09:23:02AM +0100, Ahmad Fatoum wrote:
> Now that the stack base region is determined dynamically,
> mem_malloc_resource can no longer reserve the stack space.
> Do as ARM does and add a RISC-V specific initcall to reserve
> the main thread's stack space.
> 
> Reported-by: Antony Pavlov <antonynpavlov at gmail.com>
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---

Applied, thanks

Sascha

> Fix for master as otherwise stack could be overwritten at runtime
> ---
>  arch/riscv/cpu/core.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/arch/riscv/cpu/core.c b/arch/riscv/cpu/core.c
> index bdcd500ed748..982d378eddec 100644
> --- a/arch/riscv/cpu/core.c
> +++ b/arch/riscv/cpu/core.c
> @@ -2,6 +2,9 @@
>  /*
>   * Copyright (C) 2012 Regents of the University of California
>   * Copyright (C) 2017 SiFive
> + * Copyright (C) 2021 Ahmad Fatoum, Pengutronix
> + *
> + * Common RISC-V core initcalls.
>   *
>   * All RISC-V systems have a timer attached to every hart.  These timers can
>   * either be read from the "time" and "timeh" CSRs, and can use the SBI to
> @@ -14,8 +17,17 @@
>  #include <of.h>
>  #include <linux/clk.h>
>  #include <linux/err.h>
> +#include <memory.h>
> +#include <asm-generic/memory_layout.h>
>  #include <io.h>
>  
> +static int riscv_request_stack(void)
> +{
> +	extern unsigned long riscv_stack_top;
> +	return PTR_ERR_OR_ZERO(request_sdram_region("stack", riscv_stack_top - STACK_SIZE, STACK_SIZE));
> +}
> +coredevice_initcall(riscv_request_stack);
> +
>  static struct device_d timer_dev;
>  
>  static int riscv_probe(struct device_d *parent)
> -- 
> 2.29.2
> 
> 
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