x86_32 and x86_64 need slightly different sp0 values, and x86_32's was
incorrect for init. (This never mattered -- the init thread never
runs user code, so we never used sp0 for anything.)
Fix it and mostly unify them.
Signed-off-by: Andy Lutomirski <l...@amacapital.net>
---
arch/x86/include/asm/processor.h | 7 +++++--
arch/x86/kernel/process.c | 2 +-
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 88d9aa745898..fc6d8d0d8d53 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -811,6 +811,9 @@ static inline void spin_lock_prefetch(const void *x)
prefetchw(x);
}
+#define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \
+ TOP_OF_KERNEL_STACK_PADDING)
+
#ifdef CONFIG_X86_32
/*
* User space process size: 3GB (default).
@@ -821,7 +824,7 @@ static inline void spin_lock_prefetch(const void *x)
#define STACK_TOP_MAX STACK_TOP
#define INIT_THREAD { \
- .sp0 = sizeof(init_stack) + (long)&init_stack, \
+ .sp0 = TOP_OF_INIT_STACK, \
.vm86_info = NULL, \
.sysenter_cs = __KERNEL_CS, \
.io_bitmap_ptr = NULL, \
@@ -883,7 +886,7 @@ extern unsigned long thread_saved_pc(struct task_struct
*tsk);
#define STACK_TOP_MAX TASK_SIZE_MAX
#define INIT_THREAD { \
- .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
+ .sp0 = TOP_OF_INIT_STACK \
}
/*
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index f4c0af7fc3a0..12b1cf606ddf 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -39,7 +39,7 @@
*/
__visible DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, cpu_tss) = {
.x86_tss = {
- .sp0 = (unsigned long)&init_stack + sizeof(init_stack),
+ .sp0 = TOP_OF_INIT_STACK,
#ifdef CONFIG_X86_32
.ss0 = __KERNEL_DS,
.ss1 = __KERNEL_CS,
--
2.3.0
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
