linux-kernel - Re: [PATCH v4 06/15] mm/execmem, arch: convert simple overrides of module

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Date: Thu, 11 Apr 2024 22:53:46 +0200
From: Sam Ravnborg <sam@...nborg.org>
To: Mike Rapoport <rppt@...nel.org>
Cc: linux-kernel@...r.kernel.org, Alexandre Ghiti <alexghiti@...osinc.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Björn Töpel <bjorn@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	"David S. Miller" <davem@...emloft.net>,
	Dinh Nguyen <dinguyen@...nel.org>,
	Donald Dutile <ddutile@...hat.com>,
	Eric Chanudet <echanude@...hat.com>,
	Heiko Carstens <hca@...ux.ibm.com>, Helge Deller <deller@....de>,
	Huacai Chen <chenhuacai@...nel.org>,
	Kent Overstreet <kent.overstreet@...ux.dev>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nadav Amit <nadav.amit@...il.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Puranjay Mohan <puranjay12@...il.com>,
	Rick Edgecombe <rick.p.edgecombe@...el.com>,
	Russell King <linux@...linux.org.uk>, Song Liu <song@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Thomas Gleixner <tglx@...utronix.de>, Will Deacon <will@...nel.org>,
	bpf@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
	linux-mm@...ck.org, linux-modules@...r.kernel.org,
	linux-parisc@...r.kernel.org, linux-riscv@...ts.infradead.org,
	linux-s390@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, loongarch@...ts.linux.dev,
	netdev@...r.kernel.org, sparclinux@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v4 06/15] mm/execmem, arch: convert simple overrides of
 module_alloc to execmem

Hi Mike.

On Thu, Apr 11, 2024 at 07:00:42PM +0300, Mike Rapoport wrote:
> From: "Mike Rapoport (IBM)" <rppt@...nel.org>
> 
> Several architectures override module_alloc() only to define address
> range for code allocations different than VMALLOC address space.
> 
> Provide a generic implementation in execmem that uses the parameters for
> address space ranges, required alignment and page protections provided
> by architectures.
> 
> The architectures must fill execmem_info structure and implement
> execmem_arch_setup() that returns a pointer to that structure. This way the
> execmem initialization won't be called from every architecture, but rather
> from a central place, namely a core_initcall() in execmem.
> 
> The execmem provides execmem_alloc() API that wraps __vmalloc_node_range()
> with the parameters defined by the architectures.  If an architecture does
> not implement execmem_arch_setup(), execmem_alloc() will fall back to
> module_alloc().
> 
> Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
> ---

This code snippet could be more readable ...
> diff --git a/arch/sparc/kernel/module.c b/arch/sparc/kernel/module.c
> index 66c45a2764bc..b70047f944cc 100644
> --- a/arch/sparc/kernel/module.c
> +++ b/arch/sparc/kernel/module.c
> @@ -14,6 +14,7 @@
>  #include <linux/string.h>
>  #include <linux/ctype.h>
>  #include <linux/mm.h>
> +#include <linux/execmem.h>
>  
>  #include <asm/processor.h>
>  #include <asm/spitfire.h>
> @@ -21,34 +22,26 @@
>  
>  #include "entry.h"
>  
> +static struct execmem_info execmem_info __ro_after_init = {
> +	.ranges = {
> +		[EXECMEM_DEFAULT] = {
>  #ifdef CONFIG_SPARC64
> -
> -#include <linux/jump_label.h>
> -
> -static void *module_map(unsigned long size)
> -{
> -	if (PAGE_ALIGN(size) > MODULES_LEN)
> -		return NULL;
> -	return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
> -				GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE,
> -				__builtin_return_address(0));
> -}
> +			.start = MODULES_VADDR,
> +			.end = MODULES_END,
>  #else
> -static void *module_map(unsigned long size)
> +			.start = VMALLOC_START,
> +			.end = VMALLOC_END,
> +#endif
> +			.alignment = 1,
> +		},
> +	},
> +};
> +
> +struct execmem_info __init *execmem_arch_setup(void)
>  {
> -	return vmalloc(size);
> -}
> -#endif /* CONFIG_SPARC64 */
> -
> -void *module_alloc(unsigned long size)
> -{
> -	void *ret;
> -
> -	ret = module_map(size);
> -	if (ret)
> -		memset(ret, 0, size);
> +	execmem_info.ranges[EXECMEM_DEFAULT].pgprot = PAGE_KERNEL;
>  
> -	return ret;
> +	return &execmem_info;
>  }
>  
>  /* Make generic code ignore STT_REGISTER dummy undefined symbols.  */

.. if the following was added:

diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h
index 9e85d57ac3f2..62bcafe38b1f 100644
--- a/arch/sparc/include/asm/pgtable_32.h
+++ b/arch/sparc/include/asm/pgtable_32.h
@@ -432,6 +432,8 @@ static inline int io_remap_pfn_range(struct vm_area_struct *vma,

 #define VMALLOC_START           _AC(0xfe600000,UL)
 #define VMALLOC_END             _AC(0xffc00000,UL)
+#define MODULES_VADDR           VMALLOC_START
+#define MODULES_END             VMALLOC_END


Then the #ifdef CONFIG_SPARC64 could be dropped and the code would be
the same for 32 and 64 bits.

Just a drive-by comment.

	Sam