linux-kernel - linux-next: build failure after merge of the percpu tree

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Date:   Mon, 11 Dec 2023 17:14:06 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux-foundation.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Alexandre Ghiti <alexghiti@...osinc.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the percpu tree

Hi all,

After merging the percpu tree, today's linux-next build (sparc64
defconfig) failed like this:

mm/percpu.c: In function 'pcpu_page_first_chunk':
mm/percpu.c:3336:17: error: implicit declaration of function 'flush_cache_vmap_early'; did you mean 'flush_cache_vmap'? [-Werror=implicit-function-declaration]
 3336 |                 flush_cache_vmap_early(unit_addr, unit_addr + ai->unit_size); 
      |                 ^~~~~~~~~~~~~~~~~~~~~~
      |                 flush_cache_vmap
cc1: some warnings being treated as errors

Caused by commit

  a95c15a43f4a ("mm: Introduce flush_cache_vmap_early() and its riscv implementation")

I have applied the following fix patch for today.  Are there other
archs that don't use asm-generic/cacheflush.h?

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Mon, 11 Dec 2023 16:57:00 +1100
Subject: [PATCH] fix up for "mm: Introduce flush_cache_vmap_early() and its riscv implementation"

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 arch/sparc/include/asm/cacheflush.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/sparc/include/asm/cacheflush.h b/arch/sparc/include/asm/cacheflush.h
index 881ac76eab93..9d87b2bcb217 100644
--- a/arch/sparc/include/asm/cacheflush.h
+++ b/arch/sparc/include/asm/cacheflush.h
@@ -10,4 +10,11 @@
 #else
 #include <asm/cacheflush_32.h>
 #endif
+
+#ifndef __ASSEMBLY__
+static inline void flush_cache_vmap_early(unsigned long start, unsigned long end)
+{
+}
+#endif
+
 #endif
-- 
2.40.1

-- 
Cheers,
Stephen Rothwell

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