linux-kernel - [PATCH v2 07/12] powerpc/32s: Blacklist functions running with MMU disabled for kprobe

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Date:   Tue, 31 Mar 2020 16:03:42 +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 07/12] powerpc/32s: Blacklist functions running with MMU
 disabled 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/book3s32/hash_low.S | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/mm/book3s32/hash_low.S b/arch/powerpc/mm/book3s32/hash_low.S
index 2afa3fa2012d..f5f836477009 100644
--- a/arch/powerpc/mm/book3s32/hash_low.S
+++ b/arch/powerpc/mm/book3s32/hash_low.S
@@ -163,6 +163,7 @@ _GLOBAL(hash_page)
 	stw	r0, (mmu_hash_lock - PAGE_OFFSET)@l(r8)
 	blr
 #endif /* CONFIG_SMP */
+_ASM_NOKPROBE_SYMBOL(hash_page)
 
 /*
  * Add an entry for a particular page to the hash table.
@@ -267,6 +268,7 @@ _GLOBAL(add_hash_page)
 	lwz	r0,4(r1)
 	mtlr	r0
 	blr
+_ASM_NOKPROBE_SYMBOL(add_hash_page)
 
 /*
  * This routine adds a hardware PTE to the hash table.
@@ -472,6 +474,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT)
 
 	sync		/* make sure pte updates get to memory */
 	blr
+_ASM_NOKPROBE_SYMBOL(create_hpte)
 
 	.section .bss
 	.align	2
@@ -628,6 +631,7 @@ _GLOBAL(flush_hash_pages)
 	isync
 	blr
 EXPORT_SYMBOL(flush_hash_pages)
+_ASM_NOKPROBE_SYMBOL(flush_hash_pages)
 
 /*
  * Flush an entry from the TLB
@@ -665,6 +669,7 @@ _GLOBAL(_tlbie)
 	sync
 #endif /* CONFIG_SMP */
 	blr
+_ASM_NOKPROBE_SYMBOL(_tlbie)
 
 /*
  * Flush the entire TLB. 603/603e only
@@ -706,3 +711,4 @@ _GLOBAL(_tlbia)
 	isync
 #endif /* CONFIG_SMP */
 	blr
+_ASM_NOKPROBE_SYMBOL(_tlbia)
-- 
2.25.0