linux-kernel - [PATCH v4 6/7] powerpc: mm: add VM_IOREMAP flag to the vmalloc area

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Message-Id: <20230201091339.61761-7-bhe@redhat.com>
Date:   Wed,  1 Feb 2023 17:13:38 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org,
        stephen.s.brennan@...cle.com, urezki@...il.com, lstoakes@...il.com,
        willy@...radead.org, hch@...radead.org, error27@...il.com,
        Baoquan He <bhe@...hat.com>
Subject: [PATCH v4 6/7] powerpc: mm: add VM_IOREMAP flag to the vmalloc area

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@...hat.com>
Reviewed-by: Lorenzo Stoakes <lstoakes@...il.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 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