[PATCH] x86-64: Account for module percpu space separately from kernel percpu

Rather than using a single constant PERCPU_ENOUGH_ROOM, compute it as
the sum of kernel_percpu + PERCPU_MODULE_RESERVE.  This is now common
to all architectures; if an architecture wants to set
PERCPU_ENOUGH_ROOM to something special, then it may do so (ia64 is
the only one which does).

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Andi Kleen <ak@suse.de>

5 files changed, 9 insertions, 36 deletions

diff --git a/include/asm-alpha/percpu.h b/include/asm-alpha/percpu.h
index 651ebb141b24..48348fe34c19 100644
--- a/include/asm-alpha/percpu.h
+++ b/include/asm-alpha/percpu.h
@@ -1,20 +1,6 @@
 #ifndef __ALPHA_PERCPU_H
 #define __ALPHA_PERCPU_H
 
-/*
- * Increase the per cpu area for Alpha so that
- * modules using percpu area can load.
- */
-#ifdef CONFIG_MODULES
-# define PERCPU_MODULE_RESERVE 8192
-#else
-# define PERCPU_MODULE_RESERVE 0
-#endif
-
-#define PERCPU_ENOUGH_ROOM \
-        (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \
-         PERCPU_MODULE_RESERVE)
-
 #include <asm-generic/percpu.h>
 
 #endif /* __ALPHA_PERCPU_H */
diff --git a/include/asm-sparc64/percpu.h b/include/asm-sparc64/percpu.h
index 0d3df76aa47f..ced8cbde046d 100644
--- a/include/asm-sparc64/percpu.h
+++ b/include/asm-sparc64/percpu.h
@@ -5,16 +5,6 @@
 
 #ifdef CONFIG_SMP
 
-#ifdef CONFIG_MODULES
-# define PERCPU_MODULE_RESERVE 8192
-#else
-# define PERCPU_MODULE_RESERVE 0
-#endif
-
-#define PERCPU_ENOUGH_ROOM \
-        (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \
-         PERCPU_MODULE_RESERVE)
-
 extern void setup_per_cpu_areas(void);
 
 extern unsigned long __per_cpu_base;
diff --git a/include/asm-x86_64/percpu.h b/include/asm-x86_64/percpu.h
index 5ed0ef340842..c6fbb67eac90 100644
--- a/include/asm-x86_64/percpu.h
+++ b/include/asm-x86_64/percpu.h
@@ -11,16 +11,6 @@
 
 #include <asm/pda.h>
 
-#ifdef CONFIG_MODULES
-# define PERCPU_MODULE_RESERVE 8192
-#else
-# define PERCPU_MODULE_RESERVE 0
-#endif
-
-#define PERCPU_ENOUGH_ROOM \
-        (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \
-         PERCPU_MODULE_RESERVE)
-
 #define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset)
 #define __my_cpu_offset() read_pda(data_offset)
 
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 600e3d387ffc..b72be2f79e6a 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -11,9 +11,16 @@
 
 /* Enough to cover all DEFINE_PER_CPUs in kernel, including modules. */
 #ifndef PERCPU_ENOUGH_ROOM
-#define PERCPU_ENOUGH_ROOM 32768
+#ifdef CONFIG_MODULES
+#define PERCPU_MODULE_RESERVE   8192
+#else
+#define PERCPU_MODULE_RESERVE   0
 #endif
 
+#define PERCPU_ENOUGH_ROOM                                              \
+        (__per_cpu_end - __per_cpu_start + PERCPU_MODULE_RESERVE)
+#endif  /* PERCPU_ENOUGH_ROOM */
+
 /*
  * Must be an lvalue. Since @var must be a simple identifier,
  * we force a syntax error here if it isn't.
diff --git a/kernel/module.c b/kernel/module.c
index 9da5af668a20..cf49ca25fcce 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -430,7 +430,7 @@ static int percpu_modinit(void)
         pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
                             GFP_KERNEL);
         /* Static in-kernel percpu data (used). */
-        pcpu_size[0] = -ALIGN(__per_cpu_end-__per_cpu_start, SMP_CACHE_BYTES);
+        pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
         /* Free room. */
         pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
         if (pcpu_size[1] < 0) {