linux-kernel - Re: [RFC][PATCH 05/10] mm: Add vmalloc_huge

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Message-ID: <ZLFlq3T13G2Zb7ey@casper.infradead.org>
Date:   Fri, 14 Jul 2023 16:11:39 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     tglx@...utronix.de, axboe@...nel.dk, linux-kernel@...r.kernel.org,
        mingo@...hat.com, dvhart@...radead.org, dave@...olabs.net,
        andrealmeid@...lia.com, Andrew Morton <akpm@...ux-foundation.org>,
        urezki@...il.com, hch@...radead.org, lstoakes@...il.com,
        Arnd Bergmann <arnd@...db.de>, linux-api@...r.kernel.org,
        linux-mm@...ck.org, linux-arch@...r.kernel.org,
        malteskarupke@....de
Subject: Re: [RFC][PATCH 05/10] mm: Add vmalloc_huge_node()

On Fri, Jul 14, 2023 at 05:09:48PM +0200, Peter Zijlstra wrote:
> On Fri, Jul 14, 2023 at 03:37:38PM +0100, Matthew Wilcox wrote:
> > On Fri, Jul 14, 2023 at 03:39:04PM +0200, Peter Zijlstra wrote:
> > > +void *vmalloc_huge_node(unsigned long size, gfp_t gfp_mask, int node)
> > > +{
> > > +	return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
> > > +				    gfp_mask, PAGE_KERNEL, VM_ALLOW_HUGE_VMAP,
> > > +				    node, __builtin_return_address(0));
> > > +}
> > > +
> > >  /**
> > >   * vmalloc_huge - allocate virtually contiguous memory, allow huge pages
> > >   * @size:      allocation size
> > > @@ -3430,9 +3437,7 @@ EXPORT_SYMBOL(vmalloc);
> > >   */
> > >  void *vmalloc_huge(unsigned long size, gfp_t gfp_mask)
> > >  {
> > > -	return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
> > > -				    gfp_mask, PAGE_KERNEL, VM_ALLOW_HUGE_VMAP,
> > > -				    NUMA_NO_NODE, __builtin_return_address(0));
> > > +	return vmalloc_huge_node(size, gfp_mask, NUMA_NO_NODE);
> > >  }
> > 
> > Isn't this going to result in the "caller" being always recorded as
> > vmalloc_huge() instead of the caller of vmalloc_huge()?
> 
> Durr, I missed that, but it depends, not if the compiler inlines it.
> 
> I'll make a common __always_inline helper to cure this.

... or just don't change vmalloc_huge()?  Or make the common helper take
the __builtin_return_address as a parameter?