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authorLinus Torvalds <torvalds@linux-foundation.org>2011-05-24 11:53:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-24 11:53:42 -0700
commit5129df03d0c44b2d5a5f9d7d52f3b079706b9a8f (patch)
tree799e309a7db032cb7abe9f0fa910c2989c3fdab5 /include/asm-generic
parent4d429480352c63db2228489f0db9fd381cdc3c9c (diff)
parent6988f20fe04e9ef3aea488cb8ab57fbeb78e12f0 (diff)
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Merge branch 'for-2.6.40' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
* 'for-2.6.40' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: percpu: Unify input section names percpu: Avoid extra NOP in percpu_cmpxchg16b_double percpu: Cast away printk format warning percpu: Always align percpu output section to PAGE_SIZE Fix up fairly trivial conflict in arch/x86/include/asm/percpu.h as per Tejun
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/vmlinux.lds.h61
1 files changed, 32 insertions, 29 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 077c00d..db22d13 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -15,7 +15,7 @@
* HEAD_TEXT_SECTION
* INIT_TEXT_SECTION(PAGE_SIZE)
* INIT_DATA_SECTION(...)
- * PERCPU(CACHELINE_SIZE, PAGE_SIZE)
+ * PERCPU_SECTION(CACHELINE_SIZE)
* __init_end = .;
*
* _stext = .;
@@ -682,6 +682,28 @@
}
/**
+ * PERCPU_INPUT - the percpu input sections
+ * @cacheline: cacheline size
+ *
+ * The core percpu section names and core symbols which do not rely
+ * directly upon load addresses.
+ *
+ * @cacheline is used to align subsections to avoid false cacheline
+ * sharing between subsections for different purposes.
+ */
+#define PERCPU_INPUT(cacheline) \
+ VMLINUX_SYMBOL(__per_cpu_start) = .; \
+ *(.data..percpu..first) \
+ . = ALIGN(PAGE_SIZE); \
+ *(.data..percpu..page_aligned) \
+ . = ALIGN(cacheline); \
+ *(.data..percpu..readmostly) \
+ . = ALIGN(cacheline); \
+ *(.data..percpu) \
+ *(.data..percpu..shared_aligned) \
+ VMLINUX_SYMBOL(__per_cpu_end) = .;
+
+/**
* PERCPU_VADDR - define output section for percpu area
* @cacheline: cacheline size
* @vaddr: explicit base address (optional)
@@ -703,52 +725,33 @@
*
* Note that this macros defines __per_cpu_load as an absolute symbol.
* If there is no need to put the percpu section at a predetermined
- * address, use PERCPU().
+ * address, use PERCPU_SECTION.
*/
#define PERCPU_VADDR(cacheline, vaddr, phdr) \
VMLINUX_SYMBOL(__per_cpu_load) = .; \
.data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
- LOAD_OFFSET) { \
- VMLINUX_SYMBOL(__per_cpu_start) = .; \
- *(.data..percpu..first) \
- . = ALIGN(PAGE_SIZE); \
- *(.data..percpu..page_aligned) \
- . = ALIGN(cacheline); \
- *(.data..percpu..readmostly) \
- . = ALIGN(cacheline); \
- *(.data..percpu) \
- *(.data..percpu..shared_aligned) \
- VMLINUX_SYMBOL(__per_cpu_end) = .; \
+ PERCPU_INPUT(cacheline) \
} phdr \
. = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
/**
- * PERCPU - define output section for percpu area, simple version
+ * PERCPU_SECTION - define output section for percpu area, simple version
* @cacheline: cacheline size
- * @align: required alignment
*
- * Align to @align and outputs output section for percpu area. This macro
- * doesn't manipulate @vaddr or @phdr and __per_cpu_load and
+ * Align to PAGE_SIZE and outputs output section for percpu area. This
+ * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
* __per_cpu_start will be identical.
*
- * This macro is equivalent to ALIGN(@align); PERCPU_VADDR(@cacheline,,)
+ * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
* except that __per_cpu_load is defined as a relative symbol against
* .data..percpu which is required for relocatable x86_32 configuration.
*/
-#define PERCPU(cacheline, align) \
- . = ALIGN(align); \
+#define PERCPU_SECTION(cacheline) \
+ . = ALIGN(PAGE_SIZE); \
.data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__per_cpu_load) = .; \
- VMLINUX_SYMBOL(__per_cpu_start) = .; \
- *(.data..percpu..first) \
- . = ALIGN(PAGE_SIZE); \
- *(.data..percpu..page_aligned) \
- . = ALIGN(cacheline); \
- *(.data..percpu..readmostly) \
- . = ALIGN(cacheline); \
- *(.data..percpu) \
- *(.data..percpu..shared_aligned) \
- VMLINUX_SYMBOL(__per_cpu_end) = .; \
+ PERCPU_INPUT(cacheline) \
}