linux-kernel - [patch 1/4] sparc/mm/highmem: Flush cache and TLB

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Date:   Tue, 12 Jan 2021 18:01:37 +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>,
        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>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org
Subject: [patch 1/4] sparc/mm/highmem: Flush cache and TLB

The recent conversion to the generic kmap_local infrastructure failed to
assign the proper pre/post map/unmap flush operations for sparc.

Sparc requires cache flush before map/unmap and tlb flush afterwards.

Fixes: 3293efa97807 ("sparc/mm/highmem: Switch to generic kmap atomic")
Reported-by: Andreas Larsson <andreas@...sler.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: sparclinux@...r.kernel.org
---
 arch/sparc/include/asm/highmem.h |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/arch/sparc/include/asm/highmem.h
+++ b/arch/sparc/include/asm/highmem.h
@@ -50,10 +50,11 @@ extern pte_t *pkmap_page_table;
 
 #define flush_cache_kmaps()	flush_cache_all()
 
-/* FIXME: Use __flush_tlb_one(vaddr) instead of flush_cache_all() -- Anton */
-#define arch_kmap_local_post_map(vaddr, pteval)	flush_cache_all()
-#define arch_kmap_local_post_unmap(vaddr)	flush_cache_all()
-
+/* FIXME: Use __flush_*_one(vaddr) instead of flush_*_all() -- Anton */
+#define arch_kmap_local_pre_map(vaddr, pteval)	flush_cache_all()
+#define arch_kmap_local_pre_unmap(vaddr)	flush_cache_all()
+#define arch_kmap_local_post_map(vaddr, pteval)	flush_tlb_all()
+#define arch_kmap_local_post_unmap(vaddr)	flush_tlb_all()
 
 #endif /* __KERNEL__ */