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authorHugh Dickins <hugh@veritas.com>2005-10-29 21:16:21 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 00:40:40 -0400
commit872fec16d9a0ed3b75b8893aa217e49cca575ee5 (patch)
tree1dfc8b9f2754bdfff645188e497865c00201d535 /arch/s390
parent46dea3d092d23a58b42499cc8a21de0fad079f4a (diff)
[PATCH] mm: init_mm without ptlock
First step in pushing down the page_table_lock. init_mm.page_table_lock has been used throughout the architectures (usually for ioremap): not to serialize kernel address space allocation (that's usually vmlist_lock), but because pud_alloc,pmd_alloc,pte_alloc_kernel expect caller holds it. Reverse that: don't lock or unlock init_mm.page_table_lock in any of the architectures; instead rely on pud_alloc,pmd_alloc,pte_alloc_kernel to take and drop it when allocating a new one, to check lest a racing task already did. Similarly no page_table_lock in vmalloc's map_vm_area. Some temporary ugliness in __pud_alloc and __pmd_alloc: since they also handle user mms, which are converted only by a later patch, for now they have to lock differently according to whether or not it's init_mm. If sources get muddled, there's a danger that an arch source taking init_mm.page_table_lock will be mixed with common source also taking it (or neither take it). So break the rules and make another change, which should break the build for such a mismatch: remove the redundant mm arg from pte_alloc_kernel (ppc64 scrapped its distinct ioremap_mm in 2.6.13). Exceptions: arm26 used pte_alloc_kernel on user mm, now pte_alloc_map; ia64 used pte_alloc_map on init_mm, now pte_alloc_kernel; parisc had bad args to pmd_alloc and pte_alloc_kernel in unused USE_HPPA_IOREMAP code; ppc64 map_io_page forgot to unlock on failure; ppc mmu_mapin_ram and ppc64 im_free took page_table_lock for no good reason. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/mm/ioremap.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/s390/mm/ioremap.c b/arch/s390/mm/ioremap.c
index c6c39d868bc8..0f6e9ecbefe2 100644
--- a/arch/s390/mm/ioremap.c
+++ b/arch/s390/mm/ioremap.c
@@ -58,7 +58,7 @@ static inline int remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned lo
58 if (address >= end) 58 if (address >= end)
59 BUG(); 59 BUG();
60 do { 60 do {
61 pte_t * pte = pte_alloc_kernel(&init_mm, pmd, address); 61 pte_t * pte = pte_alloc_kernel(pmd, address);
62 if (!pte) 62 if (!pte)
63 return -ENOMEM; 63 return -ENOMEM;
64 remap_area_pte(pte, address, end - address, address + phys_addr, flags); 64 remap_area_pte(pte, address, end - address, address + phys_addr, flags);
@@ -80,7 +80,6 @@ static int remap_area_pages(unsigned long address, unsigned long phys_addr,
80 flush_cache_all(); 80 flush_cache_all();
81 if (address >= end) 81 if (address >= end)
82 BUG(); 82 BUG();
83 spin_lock(&init_mm.page_table_lock);
84 do { 83 do {
85 pmd_t *pmd; 84 pmd_t *pmd;
86 pmd = pmd_alloc(&init_mm, dir, address); 85 pmd = pmd_alloc(&init_mm, dir, address);
@@ -94,7 +93,6 @@ static int remap_area_pages(unsigned long address, unsigned long phys_addr,
94 address = (address + PGDIR_SIZE) & PGDIR_MASK; 93 address = (address + PGDIR_SIZE) & PGDIR_MASK;
95 dir++; 94 dir++;
96 } while (address && (address < end)); 95 } while (address && (address < end));
97 spin_unlock(&init_mm.page_table_lock);
98 flush_tlb_all(); 96 flush_tlb_all();
99 return 0; 97 return 0;
100} 98}