linux-kernel - [PATCH] ia64: Fix kernel BUG at lib/ioremap.c:72!

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Date:   Mon, 20 Aug 2018 09:31:04 -0700
From:   Tony Luck <tony.luck@...el.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Tony Luck <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Sinan Kaya <okaya@...eaurora.org>,
        Tomasz Nowicki <tn@...ihalf.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH] ia64: Fix kernel BUG at lib/ioremap.c:72!

Commit:
  0bbf47eab469 ("ia64: use asm-generic/io.h")

results in a BUG while booting ia64.  This is because
asm-generic/io.h defines PCI_IOBASE, which results in
the function acpi_pci_root_remap_iospace() doing a lot
of unnecessary (and wrong) things.

I'd suggested an #if !CONFIG_IA64 in the functon, but Arnd
suggested keeping the fix inside the arch/ia64 tree.

Fixes: 0bbf47eab469 ("ia64: use asm-generic/io.h")
Suggested-by: Arnd Bergman <arnd@...db.de>
Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/ia64/include/asm/io.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h
index 6f952171abf9..1e6fef69bb01 100644
--- a/arch/ia64/include/asm/io.h
+++ b/arch/ia64/include/asm/io.h
@@ -454,6 +454,7 @@ extern void memset_io(volatile void __iomem *s, int c, long n);
 #define xlate_dev_kmem_ptr xlate_dev_kmem_ptr
 #define xlate_dev_mem_ptr xlate_dev_mem_ptr
 #include <asm-generic/io.h>
+#undef PCI_IOBASE
 
 # endif /* __KERNEL__ */
 
-- 
2.17.1