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Date:   Mon, 25 Apr 2022 14:27:06 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-mm@kvack.org, Song Liu <song@kernel.org>
Subject: Re: Linux 5.18-rc4
Message-Id: <20220425142706.23e6bea1d5bfdd944e33bc96@linux-foundation.org>
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        <YmZvAUakbWnyQEqa@debian>
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On Mon, 25 Apr 2022 10:50:57 +0100 Sudip Mukherjee <sudipm.mukherjee@gmail.com> wrote:

> Hi Linus,
> 
> On Sun, Apr 24, 2022 at 03:22:59PM -0700, Linus Torvalds wrote:
> > Fairly slow and calm week - which makes me just suspect that the other
> > shoe will drop at some point.
> > 
> > But maybe things are just going really well this release. It's bound
> > to happen _occasionally_, after all.
> 
> My last night's mainline build failed for arm.
> Build was with af2d861d4cd2 ("Linux 5.18-rc4").
> 
> imxrt_defconfig -> failed
> lpc18xx_defconfig -> failed
> mps2_defconfig -> failed
> stm32_defconfig -> failed
> vf610m4_defconfig -> failed
> 
> arm-linux-gnueabi-ld: mm/page_alloc.o: in function `alloc_large_system_hash':
> page_alloc.c:(.init.text+0xe7c): undefined reference to `vmalloc_huge'

Thanks.  oops.  We broke nommu.

From: Andrew Morton <akpm@linux-foundation.org>
Subject: mm/nommu.c: provide vmalloc_huge() for CONFIG_MMU=n

Fixes: f2edd118d02dd ("page_alloc: use vmalloc_huge for large system hash")
Reported-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Song Liu <song@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/nommu.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/mm/nommu.c~a
+++ a/mm/nommu.c
@@ -226,6 +226,12 @@ void *vmalloc(unsigned long size)
 }
 EXPORT_SYMBOL(vmalloc);
 
+void *vmalloc_huge(unsigned long size, gfp_t gfp_mask)
+{
+	return vmalloc(size);
+}
+EXPORT_SYMBOL(vmalloc_huge);
+
 /*
  *	vzalloc - allocate virtually contiguous memory with zero fill
  *
_


I don't see any point in copy-n-pasting the kerneldoc over.  Perhaps we
should just delete all the copy-n-paste kerneldoc from nommu.c and say
"go look at the MMU version of this function".