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authorMichael Ellerman <michael@ellerman.id.au>2010-01-28 13:23:22 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-03-09 11:52:52 +1100
commit1426d5a3bd07589534286375998c0c8c6fdc5260 (patch)
treefade4f3afd6324b46e27f3c8702935a7edc2fe21 /arch/powerpc/include/asm/paca.h
parent59603b9ae426e968d452f9325cdcff308573dee7 (diff)
downloadop-kernel-dev-1426d5a3bd07589534286375998c0c8c6fdc5260.zip
op-kernel-dev-1426d5a3bd07589534286375998c0c8c6fdc5260.tar.gz
powerpc: Dynamically allocate pacas
On 64-bit kernels we currently have a 512 byte struct paca_struct for each cpu (usually just called "the paca"). Currently they are statically allocated, which means a kernel built for a large number of cpus will waste a lot of space if it's booted on a machine with few cpus. We can avoid that by only allocating the number of pacas we need at boot. However this is complicated by the fact that we need to access the paca before we know how many cpus there are in the system. The solution is to dynamically allocate enough space for NR_CPUS pacas, but then later in boot when we know how many cpus we have, we free any unused pacas. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/paca.h')
-rw-r--r--arch/powerpc/include/asm/paca.h18
1 files changed, 16 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
index d8a6931..a011603 100644
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h
@@ -14,6 +14,9 @@
#define _ASM_POWERPC_PACA_H
#ifdef __KERNEL__
+#ifdef CONFIG_PPC64
+
+#include <linux/init.h>
#include <asm/types.h>
#include <asm/lppaca.h>
#include <asm/mmu.h>
@@ -145,8 +148,19 @@ struct paca_struct {
#endif
};
-extern struct paca_struct paca[];
-extern void initialise_pacas(void);
+extern struct paca_struct *paca;
+extern __initdata struct paca_struct boot_paca;
+extern void initialise_paca(struct paca_struct *new_paca, int cpu);
+
+extern void allocate_pacas(void);
+extern void free_unused_pacas(void);
+
+#else /* CONFIG_PPC64 */
+
+static inline void allocate_pacas(void) { };
+static inline void free_unused_pacas(void) { };
+
+#endif /* CONFIG_PPC64 */
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_PACA_H */
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