Thread (7 messages) flat view 7 messages, 3 authors, 2021-01-13
STALE2050d

[patch 3/4] mips/mm/highmem: Use set_pte() for kmap_local()

From: Thomas Gleixner <hidden>
Date: 2021-01-12 17:05:53
Also in: linux-mm, lkml, sparclinux

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@crapouillou.net>
Reported-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Thomas Gleixner <redacted>
---
 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)
 
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