linux-kernel - [PATCH 5/5] unicore32: Use the generic devmem_is

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Date:   Thu,  9 Jul 2020 13:05:52 -0700
From:   Palmer Dabbelt <palmer@...belt.com>
To:         linux-riscv@...ts.infradead.org, zong.li@...ive.com
Cc:     linux@...linux.org.uk, catalin.marinas@....com, will@...nel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>, aou@...s.berkeley.edu,
        gxt@....edu.cn, Arnd Bergmann <arnd@...db.de>,
        akpm@...ux-foundation.org, linus.walleij@...aro.org,
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        Nick Desaulniers <ndesaulniers@...gle.com>,
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        davidgow@...gle.com, ardb@...nel.org, takahiro.akashi@...aro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-arch@...r.kernel.org,
        kernel-team@...roid.com, Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: [PATCH 5/5] unicore32: Use the generic devmem_is_allowed()

From: Palmer Dabbelt <palmerdabbelt@...gle.com>

Aside from being inlineable, this is exactly the same as the arm64
version, which I recently copied into lib/ for use by the RISC-V port.

[I haven't even build tested this.  The lib/ patch is on riscv/for-next,
which I'm targeting for 5.9, so this won't work alone.  See the cover
letter for more details.]

Signed-off-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
---
 arch/unicore32/Kconfig          |  1 +
 arch/unicore32/include/asm/io.h | 23 -----------------------
 2 files changed, 1 insertion(+), 23 deletions(-)

diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig
index 11ba1839d198..5334f51614a5 100644
--- a/arch/unicore32/Kconfig
+++ b/arch/unicore32/Kconfig
@@ -12,6 +12,7 @@ config UNICORE32
 	select HAVE_KERNEL_LZO
 	select HAVE_KERNEL_LZMA
 	select HAVE_PCI
+	select GENERIC_LIB_DEVMEM_IS_ALLOWED
 	select VIRT_TO_BUS
 	select ARCH_HAVE_CUSTOM_GPIO_H
 	select GENERIC_FIND_FIRST_BIT
diff --git a/arch/unicore32/include/asm/io.h b/arch/unicore32/include/asm/io.h
index bd4e7c332f85..4560d2531655 100644
--- a/arch/unicore32/include/asm/io.h
+++ b/arch/unicore32/include/asm/io.h
@@ -42,28 +42,5 @@ extern void __uc32_iounmap(volatile void __iomem *addr);
 #define PIO_MASK		(unsigned int)(IO_SPACE_LIMIT)
 #define PIO_RESERVED		(PIO_OFFSET + PIO_MASK + 1)
 
-#ifdef CONFIG_STRICT_DEVMEM
-
-#include <linux/ioport.h>
-#include <linux/mm.h>
-
-/*
- * devmem_is_allowed() checks to see if /dev/mem access to a certain
- * address is valid. The argument is a physical page number.
- * We mimic x86 here by disallowing access to system RAM as well as
- * device-exclusive MMIO regions. This effectively disable read()/write()
- * on /dev/mem.
- */
-static inline int devmem_is_allowed(unsigned long pfn)
-{
-	if (iomem_is_exclusive(pfn << PAGE_SHIFT))
-		return 0;
-	if (!page_is_ram(pfn))
-		return 1;
-	return 0;
-}
-
-#endif /* CONFIG_STRICT_DEVMEM */
-
 #endif	/* __KERNEL__ */
 #endif	/* __UNICORE_IO_H__ */
-- 
2.27.0.383.g050319c2ae-goog