linux-kernel - [PATCH 1/1] arm: mm: Export __sync_icache

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Date:   Sat, 13 Apr 2019 18:30:52 +0200
From:   Heinrich Schuchardt <xypron.glpk@....de>
To:     Russell King <linux@...linux.org.uk>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Heinrich Schuchardt <xypron.glpk@....de>
Subject: [PATCH 1/1] arm: mm: Export __sync_icache_dcache() for xen-privcmd

This patch avoids
ERROR: "__sync_icache_dcache" [drivers/xen/xen-privcmd.ko] undefined!
observed when compiling v4.19.34.

The xen-privcmd driver, which can be modular, calls set_pte_at()
which in turn may call __sync_icache_dcache().

Cc: stable@...r.kernel.org
Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
---
 arch/arm/mm/flush.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c
index 58469623b015..5345f86c56d2 100644
--- a/arch/arm/mm/flush.c
+++ b/arch/arm/mm/flush.c
@@ -295,6 +295,7 @@ void __sync_icache_dcache(pte_t pteval)
 	if (pte_exec(pteval))
 		__flush_icache_all();
 }
+EXPORT_SYMBOL_GPL(__sync_icache_dcache);
 #endif

 /*
--
2.20.1