src/patches/suse-2.6.27.31/patches.xen/xen3-x86_sgi_cpus4096-02-fix-send_call_func_ip.patch

   1 From: Mike Travis <travis@sgi.com>
   2 Date: Fri, 5 Sep 2008 14:40:21 -0700
   3 Subject: [PATCH] x86: reduce stack requirements for send_call_func_ipi
   4 References: bnc#425240 FATE304266
   5 Patch-mainline: 2.6.28
   6
   7 * By converting the internal x86 smp_ops function send_call_func_ipi
   8     to pass a pointer to the cpumask_t variable, we greatly reduce the
   9     stack space required when NR_CPUS=4096.
  10
  11     Further reduction will be realized when the send_IPI_mask interface
  12     is changed in 2.6.28.
  13
  14 Signed-off-by: Mike Travis <travis@sgi.com>
  15 Signed-off-by: Ingo Molnar <mingo@elte.hu>
  16 Signed-off-by: Jiri Slaby <jslaby@suse.cz>
  17 Signed-off-by: Thomas Renninger <trenn@suse.de>
  18 Automatically created from "patches.arch/x86_sgi_cpus4096-02-fix-send_call_func_ip.patch" by xen-port-patches.py
  19
  20 Index: head-2008-11-04/arch/x86/kernel/smp-xen.c
  21 ===================================================================
  22 --- head-2008-11-04.orig/arch/x86/kernel/smp-xen.c      2008-11-04 11:55:22.000000000 +0100
  23 +++ head-2008-11-04/arch/x86/kernel/smp-xen.c   2008-11-04 11:59:11.000000000 +0100
  24 @@ -126,9 +126,9 @@ void xen_send_call_func_single_ipi(int c
  25         send_IPI_mask(cpumask_of_cpu(cpu), CALL_FUNC_SINGLE_VECTOR);
  26  }
  27
  28 -void xen_send_call_func_ipi(cpumask_t mask)
  29 +void xen_send_call_func_ipi(const cpumask_t *mask)
  30  {
  31 -       send_IPI_mask(mask, CALL_FUNCTION_VECTOR);
  32 +       send_IPI_mask(*mask, CALL_FUNCTION_VECTOR);
  33  }
  34
  35  static void stop_this_cpu(void *dummy)
  36 Index: head-2008-11-04/include/asm-x86/mach-xen/asm/smp.h
  37 ===================================================================
  38 --- head-2008-11-04.orig/include/asm-x86/mach-xen/asm/smp.h     2008-11-04 11:55:22.000000000 +0100
  39 +++ head-2008-11-04/include/asm-x86/mach-xen/asm/smp.h  2008-11-04 14:07:28.000000000 +0100
  40 @@ -57,7 +57,7 @@ struct smp_ops {
  41         void (*smp_send_stop)(void);
  42         void (*smp_send_reschedule)(int cpu);
  43
  44 -       void (*send_call_func_ipi)(cpumask_t mask);
  45 +       void (*send_call_func_ipi)(const cpumask_t *mask);
  46         void (*send_call_func_single_ipi)(int cpu);
  47  };
  48
  49 @@ -106,7 +106,7 @@ static inline void arch_send_call_functi
  50
  51  static inline void arch_send_call_function_ipi(cpumask_t mask)
  52  {
  53 -       smp_ops.send_call_func_ipi(mask);
  54 +       smp_ops.send_call_func_ipi(&mask);
  55  }
  56
  57  void native_smp_prepare_boot_cpu(void);
  58 @@ -118,13 +118,13 @@ int native_cpu_up(unsigned int cpunum);
  59
  60  void xen_smp_send_stop(void);
  61  void xen_smp_send_reschedule(int cpu);
  62 -void xen_send_call_func_ipi(cpumask_t mask);
  63 +void xen_send_call_func_ipi(const cpumask_t *mask);
  64  void xen_send_call_func_single_ipi(int cpu);
  65
  66  #define smp_send_stop          xen_smp_send_stop
  67  #define smp_send_reschedule    xen_smp_send_reschedule
  68  #define arch_send_call_function_single_ipi     xen_send_call_func_single_ipi
  69 -#define arch_send_call_function_ipi            xen_send_call_func_ipi
  70 +#define arch_send_call_function_ipi(m)         xen_send_call_func_ipi(&(m))
  71
  72  #endif /* CONFIG_XEN */
  73