linux-kernel - [patch 2/4] mm/highmem: Prepare for overriding set_pte

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Message-Id: <20210112170411.056306194@linutronix.de>
Date:   Tue, 12 Jan 2021 18:01:38 +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 2/4] mm/highmem: Prepare for overriding set_pte_at()

The generic kmap_local() map function uses set_pte_at(), but MIPS requires
set_pte() and PowerPC wants __set_pte_at().

Provide arch_kmap_local_set_pte() and default it to set_pte_at().

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 mm/highmem.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -473,6 +473,11 @@ static inline void *arch_kmap_local_high
 }
 #endif
 
+#ifndef arch_kmap_local_set_pte
+#define arch_kmap_local_set_pte(mm, vaddr, ptep, ptev)	\
+	set_pte_at(mm, vaddr, ptep, ptev)
+#endif
+
 /* Unmap a local mapping which was obtained by kmap_high_get() */
 static inline bool kmap_high_unmap_local(unsigned long vaddr)
 {
@@ -515,7 +520,7 @@ void *__kmap_local_pfn_prot(unsigned lon
 	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
 	BUG_ON(!pte_none(*(kmap_pte - idx)));
 	pteval = pfn_pte(pfn, prot);
-	set_pte_at(&init_mm, vaddr, kmap_pte - idx, pteval);
+	arch_kmap_local_set_pte(&init_mm, vaddr, kmap_pte - idx, pteval);
 	arch_kmap_local_post_map(vaddr, pteval);
 	current->kmap_ctrl.pteval[kmap_local_idx()] = pteval;
 	preempt_enable();