Commit 1befdd55 authored Oct 14, 2010 by David Daney Committed by Ralf Baechle Jan 18, 2011

MIPS: Implement __read_mostly



Just do what everyone else is doing by placing __read_mostly things in
the .data.read_mostly section.

mips_io_port_base can not be read-only (const) and writable
(__read_mostly) at the same time.  One of them has to go, so I chose
to eliminate the __read_mostly.  It will still get stuck in a portion
of memory that is not adjacent to things that are written, and thus
not be on a dirty cache line, for whatever that is worth.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1702/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

parent f5b35d0b

arch/mips/include/asm/cache.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -17,4 +17,6 @@
		#define SMP_CACHE_SHIFT L1_CACHE_SHIFT
		#define SMP_CACHE_BYTES L1_CACHE_BYTES

		#define __read_mostly __attribute__((__section__(".data.read_mostly")))

		#endif /* _ASM_CACHE_H */

arch/mips/kernel/setup.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -70,7 +70,7 @@ static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
		* mips_io_port_base is the begin of the address space to which x86 style
		* I/O ports are mapped.
		*/
		const unsigned long mips_io_port_base __read_mostly = -1;
		const unsigned long mips_io_port_base = -1;
		EXPORT_SYMBOL(mips_io_port_base);

		static struct resource code_resource = { .name = "Kernel code", };