linux-kernel - [patch 4/4] powerpc/mm/highmem: Use __set_pte_at() for kmap

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Date:   Tue, 12 Jan 2021 18:01:40 +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>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org,
        Andreas Larsson <andreas@...sler.com>,
        "David S. Miller" <davem@...emloft.net>,
        sparclinux@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: [patch 4/4] powerpc/mm/highmem: Use __set_pte_at() for kmap_local()

The original PowerPC highmem mapping function used __set_pte_at() to denote
that the mapping is per CPU. This got lost with the conversion to the
generic implementation.

Override the default map function.

Fixes: 47da42b27a56 ("powerpc/mm/highmem: Switch to generic kmap atomic")
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: linuxppc-dev@...ts.ozlabs.org
---
 arch/powerpc/include/asm/highmem.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/powerpc/include/asm/highmem.h
+++ b/arch/powerpc/include/asm/highmem.h
@@ -58,6 +58,8 @@ extern pte_t *pkmap_page_table;
 
 #define flush_cache_kmaps()	flush_cache_all()
 
+#define arch_kmap_local_set_pte(mm, vaddr, ptep, ptev)	\
+	__set_pte_at(mm, vaddr, ptep, ptev, 1)
 #define arch_kmap_local_post_map(vaddr, pteval)	\
 	local_flush_tlb_page(NULL, vaddr)
 #define arch_kmap_local_post_unmap(vaddr)	\