From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-um-bounces+geert=linux-m68k.org@lists.infradead.org>
Date: Tue, 8 Sep 2020 16:25:30 +0200
From: Alexander Gordeev <agordeev@linux.ibm.com>
Subject: Re: [RFC PATCH v2 2/3] mm: make pXd_addr_end() functions page-table
 entry aware
Message-ID: <20200908142529.GB20558@oc3871087118.ibm.com>
References: <20200907180058.64880-1-gerald.schaefer@linux.ibm.com>
 <20200907180058.64880-3-gerald.schaefer@linux.ibm.com>
 <31dfb3ed-a0cc-3024-d389-ab9bd19e881f@csgroup.eu>
MIME-Version: 1.0
Content-Disposition: inline
In-Reply-To: <31dfb3ed-a0cc-3024-d389-ab9bd19e881f@csgroup.eu>
List-Id: <linux-um.lists.infradead.org>
List-Unsubscribe: <http://lists.infradead.org/mailman/options/linux-um>,
 <mailto:linux-um-request@lists.infradead.org?subject=unsubscribe>
List-Archive: <http://lists.infradead.org/pipermail/linux-um/>
List-Post: <mailto:linux-um@lists.infradead.org>
List-Help: <mailto:linux-um-request@lists.infradead.org?subject=help>
List-Subscribe: <http://lists.infradead.org/mailman/listinfo/linux-um>,
 <mailto:linux-um-request@lists.infradead.org?subject=subscribe>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Sender: "linux-um" <linux-um-bounces@lists.infradead.org>
Errors-To: linux-um-bounces+geert=linux-m68k.org@lists.infradead.org
To: Christophe Leroy <christophe.leroy@csgroup.eu>, Michael Ellerman <mpe@ellerman.id.au>
Cc: Peter Zijlstra <peterz@infradead.org>, Catalin Marinas <catalin.marinas@arm.com>, Dave Hansen <dave.hansen@linux.intel.com>, linux-mm <linux-mm@kvack.org>, Paul Mackerras <paulus@samba.org>, linux-sparc <sparclinux@vger.kernel.org>, Claudio Imbrenda <imbrenda@linux.ibm.com>, Will Deacon <will@kernel.org>, linux-arch <linux-arch@vger.kernel.org>, linux-s390 <linux-s390@vger.kernel.org>, Vasily Gorbik <gor@linux.ibm.com>, Christian Borntraeger <borntraeger@de.ibm.com>, Richard Weinberger <richard@nod.at>, linux-x86 <x86@kernel.org>, Russell King <linux@armlinux.org.uk>, Jason Gunthorpe <jgg@ziepe.ca>, Ingo Molnar <mingo@redhat.com>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Gerald Schaefer <gerald.schaefer@linux.ibm.com>, Jeff Dike <jdike@addtoit.com>, Arnd Bergmann <arnd@arndb.de>, John Hubbard <jhubbard@nvidia.com>, Heiko Carstens <hca@linux.ibm.com>, linux-um <linux-um@lists.infradead.org>, Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>, Thomas Gleixner <tglx@linutronix.de>, linux-arm <linux-arm-kernel@lists.infradead.org>, Linus Torvalds <torvalds@linux-foundation.org>, LKML <linux-kernel@vger.kernel.org>, Andrew Morton <akpm@linux-foundation.org>, linux-power <linuxppc-dev@lists.ozlabs.org>, Mike Rapoport <rppt@kernel.org>

On Tue, Sep 08, 2020 at 07:14:38AM +0200, Christophe Leroy wrote:
[...]
> You forgot arch/powerpc/mm/book3s64/subpage_prot.c it seems.

If this one would be okay?

diff --git a/arch/powerpc/mm/book3s64/subpage_prot.c b/arch/powerpc/mm/book3s64/subpage_prot.c
index 60c6ea16..3690d22 100644
--- a/arch/powerpc/mm/book3s64/subpage_prot.c
+++ b/arch/powerpc/mm/book3s64/subpage_prot.c
@@ -88,6 +88,7 @@ static void hpte_flush_range(struct mm_struct *mm, unsigned long addr,
 static void subpage_prot_clear(unsigned long addr, unsigned long len)
 {
 	struct mm_struct *mm = current->mm;
+	pmd_t *pmd = pmd_off(mm, addr);
 	struct subpage_prot_table *spt;
 	u32 **spm, *spp;
 	unsigned long i;
@@ -103,8 +104,8 @@ static void subpage_prot_clear(unsigned long addr, unsigned long len)
 	limit = addr + len;
 	if (limit > spt->maxaddr)
 		limit = spt->maxaddr;
-	for (; addr < limit; addr = next) {
-		next = pmd_addr_end(addr, limit);
+	for (; addr < limit; addr = next, pmd++) {
+		next = pmd_addr_end(*pmd, addr, limit);
 		if (addr < 0x100000000UL) {
 			spm = spt->low_prot;
 		} else {
@@ -191,6 +192,7 @@ static void subpage_mark_vma_nohuge(struct mm_struct *mm, unsigned long addr,
 		unsigned long, len, u32 __user *, map)
 {
 	struct mm_struct *mm = current->mm;
+	pmd_t *pmd = pmd_off(mm, addr);
 	struct subpage_prot_table *spt;
 	u32 **spm, *spp;
 	unsigned long i;
@@ -236,8 +238,8 @@ static void subpage_mark_vma_nohuge(struct mm_struct *mm, unsigned long addr,
 	}
 
 	subpage_mark_vma_nohuge(mm, addr, len);
-	for (limit = addr + len; addr < limit; addr = next) {
-		next = pmd_addr_end(addr, limit);
+	for (limit = addr + len; addr < limit; addr = next, pmd++) {
+		next = pmd_addr_end(*pmd, addr, limit);
 		err = -ENOMEM;
 		if (addr < 0x100000000UL) {
 			spm = spt->low_prot;

Thanks!

> Christophe

_______________________________________________
linux-um mailing list
linux-um@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-um