linux-kernel - [patch 3/4] mips/mm/highmem: Use set_pte() for kmap

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Date:   Tue, 12 Jan 2021 18:01:39 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Peter Zijlstra <peterz@...radead.org>,
        Paul Cercueil <paul@...pouillou.net>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Andreas Larsson <andreas@...sler.com>,
        "David S. Miller" <davem@...emloft.net>,
        sparclinux@...r.kernel.org, Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org
Subject: [patch 3/4] mips/mm/highmem: Use set_pte() for kmap_local()

set_pte_at() on MIPS invokes update_cache() which might recurse into
kmap_local(). Use set_pte() like the original MIPS highmem implementation
did.

Fixes: a4c33e83bca1 ("mips/mm/highmem: Switch to generic kmap atomic")
Reported-by: Paul Cercueil <paul@...pouillou.net>
Reported-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/mips/include/asm/highmem.h |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/mips/include/asm/highmem.h
+++ b/arch/mips/include/asm/highmem.h
@@ -51,6 +51,7 @@ extern void kmap_flush_tlb(unsigned long
 
 #define flush_cache_kmaps()	BUG_ON(cpu_has_dc_aliases)
 
+#define arch_kmap_local_set_pte(mm, vaddr, ptep, ptev)	set_pte(ptep, ptev)
 #define arch_kmap_local_post_map(vaddr, pteval)	local_flush_tlb_one(vaddr)
 #define arch_kmap_local_post_unmap(vaddr)	local_flush_tlb_one(vaddr)