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author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-24 11:53:42 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-24 11:53:42 -0700 |
commit | 5129df03d0c44b2d5a5f9d7d52f3b079706b9a8f (patch) | |
tree | 799e309a7db032cb7abe9f0fa910c2989c3fdab5 /include | |
parent | 4d429480352c63db2228489f0db9fd381cdc3c9c (diff) | |
parent | 6988f20fe04e9ef3aea488cb8ab57fbeb78e12f0 (diff) | |
download | op-kernel-dev-5129df03d0c44b2d5a5f9d7d52f3b079706b9a8f.zip op-kernel-dev-5129df03d0c44b2d5a5f9d7d52f3b079706b9a8f.tar.gz |
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')
-rw-r--r-- | include/asm-generic/vmlinux.lds.h | 61 |
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) \ } |