linux-kernel - [PATCH v1 7/7] sh: mm: set VM_IOREMAP flag to the vmalloc area

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Message-Id: <20221204013046.154960-8-bhe@redhat.com>
Date:   Sun,  4 Dec 2022 09:30:46 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, stephen.s.brennan@...cle.com, urezki@...il.com,
        willy@...radead.org, akpm@...ux-foundation.org, hch@...radead.org,
        Baoquan He <bhe@...hat.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-sh@...r.kernel.org
Subject: [PATCH v1 7/7] sh: mm: set 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 ioremap in __sq_remap() of sh, we should set VM_IOREMAP
in flag to make it handled correctly as above.

Signed-off-by: Baoquan He <bhe@...hat.com>
Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
Cc: Rich Felker <dalias@...c.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-sh@...r.kernel.org (open list:SUPERH)
---
 arch/sh/kernel/cpu/sh4/sq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/sh/kernel/cpu/sh4/sq.c b/arch/sh/kernel/cpu/sh4/sq.c
index a76b94e41e91..27f2e3da5aa2 100644
--- a/arch/sh/kernel/cpu/sh4/sq.c
+++ b/arch/sh/kernel/cpu/sh4/sq.c
@@ -103,7 +103,7 @@ static int __sq_remap(struct sq_mapping *map, pgprot_t prot)
 #if defined(CONFIG_MMU)
 	struct vm_struct *vma;
 
-	vma = __get_vm_area_caller(map->size, VM_ALLOC, map->sq_addr,
+	vma = __get_vm_area_caller(map->size, VM_IOREMAP, map->sq_addr,
 			SQ_ADDRMAX, __builtin_return_address(0));
 	if (!vma)
 		return -ENOMEM;
-- 
2.34.1