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authorAndi Kleen <ak@suse.de>2005-10-04 18:21:39 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-04 18:56:52 -0400
commit944d2647dded12e2b05ad8ebc020644bb1997ce1 (patch)
tree1b4ce29652e6f01e08880a47f467ccec052f1505 /arch/x86_64
parentf6e63cfb5cfcccca510672155b90dd39bf45a35f (diff)
[PATCH] x86_64: Drop global bit from early low mappings
Drop global bit from early low mappings Suggested by Linus, originally also proposed by Suresh. This fixes a race condition with early start of udev, originally tracked down by Suresh B. Siddha. The problem was that switching to the user space VM would not clear the global low mappings for the beginning of memory, which lead to memory corruption. Drop the global bits. The kernel mapping stays global because it should stay constant. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/kernel/head.S40
1 files changed, 20 insertions, 20 deletions
diff --git a/arch/x86_64/kernel/head.S b/arch/x86_64/kernel/head.S
index 4592bf21fcaf..b92e5f45ed46 100644
--- a/arch/x86_64/kernel/head.S
+++ b/arch/x86_64/kernel/head.S
@@ -270,26 +270,26 @@ ENTRY(level3_kernel_pgt)
270.org 0x4000 270.org 0x4000
271ENTRY(level2_ident_pgt) 271ENTRY(level2_ident_pgt)
272 /* 40MB for bootup. */ 272 /* 40MB for bootup. */
273 .quad 0x0000000000000183 273 .quad 0x0000000000000083
274 .quad 0x0000000000200183 274 .quad 0x0000000000200083
275 .quad 0x0000000000400183 275 .quad 0x0000000000400083
276 .quad 0x0000000000600183 276 .quad 0x0000000000600083
277 .quad 0x0000000000800183 277 .quad 0x0000000000800083
278 .quad 0x0000000000A00183 278 .quad 0x0000000000A00083
279 .quad 0x0000000000C00183 279 .quad 0x0000000000C00083
280 .quad 0x0000000000E00183 280 .quad 0x0000000000E00083
281 .quad 0x0000000001000183 281 .quad 0x0000000001000083
282 .quad 0x0000000001200183 282 .quad 0x0000000001200083
283 .quad 0x0000000001400183 283 .quad 0x0000000001400083
284 .quad 0x0000000001600183 284 .quad 0x0000000001600083
285 .quad 0x0000000001800183 285 .quad 0x0000000001800083
286 .quad 0x0000000001A00183 286 .quad 0x0000000001A00083
287 .quad 0x0000000001C00183 287 .quad 0x0000000001C00083
288 .quad 0x0000000001E00183 288 .quad 0x0000000001E00083
289 .quad 0x0000000002000183 289 .quad 0x0000000002000083
290 .quad 0x0000000002200183 290 .quad 0x0000000002200083
291 .quad 0x0000000002400183 291 .quad 0x0000000002400083
292 .quad 0x0000000002600183 292 .quad 0x0000000002600083
293 /* Temporary mappings for the super early allocator in arch/x86_64/mm/init.c */ 293 /* Temporary mappings for the super early allocator in arch/x86_64/mm/init.c */
294 .globl temp_boot_pmds 294 .globl temp_boot_pmds
295temp_boot_pmds: 295temp_boot_pmds: