linux-kernel - Re: [PATCH v13 14/14] powerpc/64s/radix: Enable huge vmalloc mappings

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Date:   Thu, 15 Apr 2021 11:55:29 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Nicholas Piggin <npiggin@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Christoph Hellwig <hch@...radead.org>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Ding Tianhong <dingtianhong@...wei.com>,
        linuxppc-dev@...ts.ozlabs.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH v13 14/14] powerpc/64s/radix: Enable huge vmalloc
 mappings

On Thu, 15 Apr 2021 12:23:55 +0200 Christophe Leroy <christophe.leroy@...roup.eu> wrote:
> > +	 * is done. STRICT_MODULE_RWX may require extra work to support this
> > +	 * too.
> > +	 */
> >   
> > -	return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, GFP_KERNEL,
> > -				    PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS, NUMA_NO_NODE,
> 
> 
> I think you should add the following in <asm/pgtable.h>
> 
> #ifndef MODULES_VADDR
> #define MODULES_VADDR VMALLOC_START
> #define MODULES_END VMALLOC_END
> #endif
> 
> And leave module_alloc() as is (just removing the enclosing #ifdef MODULES_VADDR and adding the 
> VM_NO_HUGE_VMAP  flag)
> 
> This would minimise the conflits with the changes I did in powerpc/next reported by Stephen R.
> 

I'll drop powerpc-64s-radix-enable-huge-vmalloc-mappings.patch for now,
make life simpler.

Nick, a redo on top of Christophe's changes in linux-next would be best
please.