linux/arch/ia64/include/asm/mmu.h

#ifndef __MMU_H
#define __MMU_H

/*
 * Type for a context number.  We declare it volatile to ensure proper
 * ordering when it's accessed outside of spinlock'd critical sections
 * (e.g., as done in activate_mm() and init_new_context()).
 */
typedef volatile unsigned long mm_context_t;

typedef unsigned long nv_mm_context_t;

#endif
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-17 06:20:36 +08:00			`#ifndef __MMU_H`
			`#define __MMU_H`

			`/*`
[IA64] Fix race in mm-context wrap-around logic. The patch below should fix a race which could cause stale TLB entries. Specifically, when 2 CPUs ended up racing for entrance to wrap_mmu_context(). The losing CPU would find that by the time it acquired ctx.lock, mm->context already had a valid value, but then it failed to (re-)check the delayed TLB flushing logic and hence could end up using a context number when there were still stale entries in its TLB. The fix is to check for delayed TLB flushes only after mm->context is valid (non-zero). The patch also makes GCC v4.x happier by defining a non-volatile variant of mm_context_t called nv_mm_context_t. Signed-off-by: David Mosberger-Tang <David.Mosberger@acm.org> Signed-off-by: Tony Luck <tony.luck@intel.com> 2005-07-26 13:23:00 +08:00			`* Type for a context number. We declare it volatile to ensure proper`
			`* ordering when it's accessed outside of spinlock'd critical sections`
			`* (e.g., as done in activate_mm() and init_new_context()).`
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-17 06:20:36 +08:00			`*/`
			`typedef volatile unsigned long mm_context_t;`

[IA64] Fix race in mm-context wrap-around logic. The patch below should fix a race which could cause stale TLB entries. Specifically, when 2 CPUs ended up racing for entrance to wrap_mmu_context(). The losing CPU would find that by the time it acquired ctx.lock, mm->context already had a valid value, but then it failed to (re-)check the delayed TLB flushing logic and hence could end up using a context number when there were still stale entries in its TLB. The fix is to check for delayed TLB flushes only after mm->context is valid (non-zero). The patch also makes GCC v4.x happier by defining a non-volatile variant of mm_context_t called nv_mm_context_t. Signed-off-by: David Mosberger-Tang <David.Mosberger@acm.org> Signed-off-by: Tony Luck <tony.luck@intel.com> 2005-07-26 13:23:00 +08:00			`typedef unsigned long nv_mm_context_t;`

Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-17 06:20:36 +08:00			`#endif`