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From:   Baoquan He <bhe@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     linux-mm@kvack.org, stephen.s.brennan@oracle.com, urezki@gmail.com,
        willy@infradead.org, akpm@linux-foundation.org, hch@infradead.org,
        Baoquan He <bhe@redhat.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Nicholas Piggin <npiggin@gmail.com>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>,
        linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v1 6/7] powerpc: mm: add VM_IOREMAP flag to the vmalloc area
Date:   Sun,  4 Dec 2022 09:30:45 +0800
Message-Id: <20221204013046.154960-7-bhe@redhat.com>
In-Reply-To: <20221204013046.154960-1-bhe@redhat.com>
References: <20221204013046.154960-1-bhe@redhat.com>
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Currently, for vmalloc areas with flag VM_IOREMAP set, except of the
specific alignment clamping in __get_vm_area_node(), they will be
 1) Shown as ioremap in /proc/vmallocinfo;
 2) Ignored by /proc/kcore reading via vread()

So for the io mapping in ioremap_phb() of ppc, we should set VM_IOREMAP
in flag to make it handled correctly as above.

Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: "Pali Rohár" <pali@kernel.org>
Cc: linuxppc-dev@lists.ozlabs.org
---
 arch/powerpc/kernel/pci_64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
index 0c7cfb9fab04..fd42059ae2a5 100644
--- a/arch/powerpc/kernel/pci_64.c
+++ b/arch/powerpc/kernel/pci_64.c
@@ -132,7 +132,7 @@ void __iomem *ioremap_phb(phys_addr_t paddr, unsigned long size)
 	 * address decoding but I'd rather not deal with those outside of the
 	 * reserved 64K legacy region.
 	 */
-	area = __get_vm_area_caller(size, 0, PHB_IO_BASE, PHB_IO_END,
+	area = __get_vm_area_caller(size, VM_IOREMAP, PHB_IO_BASE, PHB_IO_END,
 				    __builtin_return_address(0));
 	if (!area)
 		return NULL;
-- 
2.34.1