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authorDavid Daney <ddaney@caviumnetworks.com>2010-10-14 12:36:49 -0700
committerRalf Baechle <ralf@linux-mips.org>2011-01-18 19:30:28 +0100
commit1befdd5536e1500371f7f884d0f0ae528a519333 (patch)
tree0c189a3c6686381f1393f9ea5cb161c36e08738f
parentf5b35d0b16a08e6c1e7c8a41fa87ad10cf9aefa4 (diff)
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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>
-rw-r--r--arch/mips/include/asm/cache.h2
-rw-r--r--arch/mips/kernel/setup.c2
2 files changed, 3 insertions, 1 deletions
diff --git a/arch/mips/include/asm/cache.h b/arch/mips/include/asm/cache.h
index 37f175c..650ac9b 100644
--- a/arch/mips/include/asm/cache.h
+++ b/arch/mips/include/asm/cache.h
@@ -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 */
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index acd3f2c..8ad1d56 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -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", };
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