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authorJack Steiner <steiner@sgi.com>2008-06-19 21:51:05 -0500
committerIngo Molnar <mingo@elte.hu>2008-07-08 12:23:28 +0200
commitb6df1b8bc1250191cfee15627697111c1cbda53f (patch)
treeb5991eafa0f5f4e155921bd10d4f44696c271b8d /include/asm-x86/mpspec.h
parentd400524affeb84bdfc2b00cd561fbfb8c09dadd7 (diff)
x86: fix stack overflow for large values of MAX_APICS
physid_mask_of_physid() causes a huge stack (12k) to be created if the number of APICS is large. Replace physid_mask_of_physid() with a new function that does not create large stacks. This is a problem only on large x86_64 systems. this paves the way to increase MAX_APICS. Signed-off-by: Jack Steiner <steiner@sgi.com> Cc: linux-mm@kvack.org Cc: mingo@elte.hu Cc: tglx@linutronix.de Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86/mpspec.h')
-rw-r--r--include/asm-x86/mpspec.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/asm-x86/mpspec.h b/include/asm-x86/mpspec.h
index 57a991b9c05..b69e7ba7bf1 100644
--- a/include/asm-x86/mpspec.h
+++ b/include/asm-x86/mpspec.h
@@ -101,6 +101,7 @@ typedef struct physid_mask physid_mask_t;
__physid_mask; \
})
+/* Note: will create very large stack frames if physid_mask_t is big */
#define physid_mask_of_physid(physid) \
({ \
physid_mask_t __physid_mask = PHYSID_MASK_NONE; \
@@ -108,6 +109,12 @@ typedef struct physid_mask physid_mask_t;
__physid_mask; \
})
+static inline void physid_set_mask_of_physid(int physid, physid_mask_t *map)
+{
+ physids_clear(*map);
+ physid_set(physid, *map);
+}
+
#define PHYSID_MASK_ALL { {[0 ... PHYSID_ARRAY_SIZE-1] = ~0UL} }
#define PHYSID_MASK_NONE { {[0 ... PHYSID_ARRAY_SIZE-1] = 0UL} }