linux-kernel - [PATCH v3 1/3] arch: Add generic Kconfig option indicating page size smaller than 64k

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Message-Id: <20211127154442.3676290-2-linux@roeck-us.net>
Date:   Sat, 27 Nov 2021 07:44:40 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Anton Altaparmakov <anton@...era.com>
Cc:     linux-ntfs-dev@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Joel Stanley <joel@....id.au>,
        Michael Ellerman <mpe@...erman.id.au>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH v3 1/3] arch: Add generic Kconfig option indicating page size smaller than 64k

NTFS_RW and VMXNET3 require a page size smaller than 64kB. Add generic
Kconfig option for use outside architecture code to avoid architecture
specific Kconfig options in that code.

Suggested-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
v3: Added patch: declare new configuration flag in generic code

 arch/Kconfig | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/Kconfig b/arch/Kconfig
index 26b8ed11639d..d3c4ab249e9c 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -991,6 +991,16 @@ config HAVE_ARCH_COMPAT_MMAP_BASES
 	  and vice-versa 32-bit applications to call 64-bit mmap().
 	  Required for applications doing different bitness syscalls.
 
+config PAGE_SIZE_LESS_THAN_64KB
+	def_bool y
+	depends on !ARM64_64K_PAGES
+	depends on !IA64_PAGE_SIZE_64KB
+	depends on !PAGE_SIZE_64KB
+	depends on !PARISC_PAGE_SIZE_64KB
+	depends on !PPC_64K_PAGES
+	depends on !PPC_256K_PAGES
+	depends on !PAGE_SIZE_256KB
+
 # This allows to use a set of generic functions to determine mmap base
 # address by giving priority to top-down scheme only if the process
 # is not in legacy mode (compat task, unlimited stack size or
-- 
2.33.0