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

From: Guenter Roeck <linux@roeck-us.net>
To: Anton Altaparmakov <anton@tuxera.com>
Cc: linux-ntfs-dev@lists.sourceforge.net,
	linux-kernel@vger.kernel.org,
	"David S . Miller" <davem@davemloft.net>,
	netdev@vger.kernel.org, Joel Stanley <joel@jms.id.au>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Arnd Bergmann <arnd@arndb.de>, Guenter Roeck <linux@roeck-us.net>
Subject: [PATCH v3 1/3] arch: Add generic Kconfig option indicating page size smaller than 64k
Date: Sat, 27 Nov 2021 07:44:40 -0800	[thread overview]
Message-ID: <20211127154442.3676290-2-linux@roeck-us.net> (raw)
In-Reply-To: <20211127154442.3676290-1-linux@roeck-us.net>

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@ellerman.id.au>
Signed-off-by: Guenter Roeck <linux@roeck-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

