BackPup/Linux
1
0 Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-10-07 22:37:45 -04:00
Code Issues Packages Projects Releases Wiki Activity

x86, 32-bit: Align percpu area and irq stacks to THREAD_SIZE

Browse Source 
The irq stacks, located in the percpu-area, need to be
THREAD_SIZE aligned. Add the infrastucture to align percpu
variables to larger-than-pagesize amounts within the percpu
area, and use it to specify the alignment for the irq stacks.
Also align the percpu area itself to THREAD_SIZE.

This should make irq stacks work with 8K THREAD_SIZE.

Signed-off-by: Alexander van Heukelum <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: [email protected]
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Alexander van Heukelum authored and Ingo Molnar committed 2010-09-07 05:07:00 +02:00
1 parent 1813a68457
commit fe8e0c25ca
3 files changed
+15 -3
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

arch/x86/kernel/irq_32.c
+2 -2
View File
@@ -60,8 +60,8 @@ union irq_ctx {
static DEFINE_PER_CPU(union irq_ctx *, hardirq_ctx);
static DEFINE_PER_CPU(union irq_ctx *, softirq_ctx);
static DEFINE_PER_CPU_PAGE_ALIGNED(union irq_ctx, hardirq_stack);
static DEFINE_PER_CPU_PAGE_ALIGNED(union irq_ctx, softirq_stack);
static DEFINE_PER_CPU_MULTIPAGE_ALIGNED(union irq_ctx, hardirq_stack, THREAD_SIZE);
static DEFINE_PER_CPU_MULTIPAGE_ALIGNED(union irq_ctx, softirq_stack, THREAD_SIZE);
static void call_on_stack(void *func, void *stack)
{
arch/x86/kernel/vmlinux.lds.S
+1 -1
View File
@@ -273,7 +273,7 @@ SECTIONS
}
#if !defined(CONFIG_X86_64) || !defined(CONFIG_SMP)
PERCPU(PAGE_SIZE)
PERCPU(THREAD_SIZE)
#endif
. = ALIGN(PAGE_SIZE);
include/linux/percpu-defs.h
+12
View File
@@ -138,6 +138,18 @@
DEFINE_PER_CPU_SECTION(type, name, "..page_aligned") \
__aligned(PAGE_SIZE)
/*
* Declaration/definition used for large per-CPU variables that must be
* aligned to something larger than the pagesize.
*/
#define DECLARE_PER_CPU_MULTIPAGE_ALIGNED(type, name, size) \
DECLARE_PER_CPU_SECTION(type, name, "..page_aligned") \
__aligned(size)
#define DEFINE_PER_CPU_MULTIPAGE_ALIGNED(type, name, size) \
DEFINE_PER_CPU_SECTION(type, name, "..page_aligned") \
__aligned(size)
/*
* Intermodule exports for per-CPU variables. sparse forgets about
* address space across EXPORT_SYMBOL(), change EXPORT_SYMBOL() to