path: root/include/asm-generic
diff options
authorTejun Heo <tj@kernel.org>2009-01-13 20:41:35 +0900
committerIngo Molnar <mingo@elte.hu>2009-01-16 14:19:46 +0100
commit1a51e3a0aed18767cf2762e95456ecfeb0bca5e6 (patch)
tree2d930218ef1072a59f7dac0f97bb03aa02796c8c /include/asm-generic
parentc8f3329a0ddd751241e96b4100df7eda14b2cbc6 (diff)
x86: fold pda into percpu area on SMP
[ Based on original patch from Christoph Lameter and Mike Travis. ] Currently pdas and percpu areas are allocated separately. %gs points to local pda and percpu area can be reached using pda->data_offset. This patch folds pda into percpu area. Due to strange gcc requirement, pda needs to be at the beginning of the percpu area so that pda->stack_canary is at %gs:40. To achieve this, a new percpu output section macro - PERCPU_VADDR_PREALLOC() - is added and used to reserve pda sized chunk at the start of the percpu area. After this change, for boot cpu, %gs first points to pda in the data.init area and later during setup_per_cpu_areas() gets updated to point to the actual pda. This means that setup_per_cpu_areas() need to reload %gs for CPU0 while clearing pda area for other cpus as cpu0 already has modified it when control reaches setup_per_cpu_areas(). This patch also removes now unnecessary get_local_pda() and its call sites. A lot of this patch is taken from Mike Travis' "x86_64: Fold pda into per cpu area" patch. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-generic')
1 files changed, 24 insertions, 1 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index fc2f55f2dcd..e53319cf29c 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -441,9 +441,10 @@
. = __per_cpu_load + SIZEOF(.data.percpu);
- * PERCPU_VADDR - define output section for percpu area
+ * PERCPU_VADDR_PREALLOC - define output section for percpu area with prealloc
* @vaddr: explicit base address (optional)
* @phdr: destination PHDR (optional)
+ * @prealloc: the size of prealloc area
* Macro which expands to output section for percpu area. If @vaddr
* is not blank, it specifies explicit base address and all percpu
@@ -455,11 +456,33 @@
* section in the linker script will go there too. @phdr should have
* a leading colon.
+ * If @prealloc is non-zero, the specified number of bytes will be
+ * reserved at the start of percpu area. As the prealloc area is
+ * likely to break alignment, this macro puts areas in increasing
+ * alignment order.
+ *
* This macro defines three symbols, __per_cpu_load, __per_cpu_start
* and __per_cpu_end. The first one is the vaddr of loaded percpu
* init data. __per_cpu_start equals @vaddr and __per_cpu_end is the
* end offset.
+#define PERCPU_VADDR_PREALLOC(vaddr, segment, prealloc) \
+ PERCPU_PROLOG(vaddr) \
+ . += prealloc; \
+ *(.data.percpu) \
+ *(.data.percpu.shared_aligned) \
+ *(.data.percpu.page_aligned) \
+ PERCPU_EPILOG(segment)
+ * PERCPU_VADDR - define output section for percpu area
+ * @vaddr: explicit base address (optional)
+ * @phdr: destination PHDR (optional)
+ *
+ * Macro which expands to output section for percpu area. Mostly
+ * identical to PERCPU_VADDR_PREALLOC(@vaddr, @phdr, 0) other than
+ * using slighly different layout.
+ */
#define PERCPU_VADDR(vaddr, phdr) \
*(.data.percpu.page_aligned) \