linux-kernel - [PATCH v2 05/12] powerpc/mem: Blacklist flush_dcache_icache

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Date:   Tue, 31 Mar 2020 16:03:40 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        naveen.n.rao@...ux.vnet.ibm.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 05/12] powerpc/mem: Blacklist flush_dcache_icache_phys()
 for kprobe

kprobe does not handle events happening in real mode, all
functions running with MMU disabled have to be blacklisted.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
Acked-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
---
 arch/powerpc/mm/mem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 9b4f5fb719e0..bcb6af6ba29a 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -32,6 +32,7 @@
 #include <linux/vmalloc.h>
 #include <linux/memremap.h>
 #include <linux/dma-direct.h>
+#include <linux/kprobes.h>
 
 #include <asm/pgalloc.h>
 #include <asm/prom.h>
@@ -466,6 +467,7 @@ static void flush_dcache_icache_phys(unsigned long physaddr)
 		: "r" (nb), "r" (msr), "i" (bytes), "r" (msr0)
 		: "ctr", "memory");
 }
+NOKPROBE_SYMBOL(flush_dcache_icache_phys)
 #endif // !defined(CONFIG_PPC_8xx) && !defined(CONFIG_PPC64)
 
 /*
-- 
2.25.0