linux-kernel - Re: [PATCH v2 01/12] nios2: define virtual address space for modules

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Message-ID: <6f9e9c385096bd965e53c49065848953398f5b8e.camel@intel.com>
Date:   Fri, 16 Jun 2023 16:00:19 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
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Subject: Re: [PATCH v2 01/12] nios2: define virtual address space for modules

On Fri, 2023-06-16 at 11:50 +0300, Mike Rapoport wrote:
>  void *module_alloc(unsigned long size)
>  {
> -       if (size == 0)
> -               return NULL;
> -       return kmalloc(size, GFP_KERNEL);
> -}
> -
> -/* Free memory returned from module_alloc */
> -void module_memfree(void *module_region)
> -{
> -       kfree(module_region);
> +       return __vmalloc_node_range(size, 1, MODULES_VADDR,
> MODULES_END,
> +                                   GFP_KERNEL, PAGE_KERNEL_EXEC,
> +                                   VM_FLUSH_RESET_PERMS,
> NUMA_NO_NODE,
> +                                   __builtin_return_address(0));
>  }
>  
>  int apply_relocate_add(Elf32_Shdr *sechdrs, const char *s

I wonder if the (size == 0) check is really needed, but
__vmalloc_node_range() will WARN on this case where the old code won't.