[PATCH] powerpc: Remove lppaca structure from the PACA

[mirror_ubuntu-zesty-kernel.git] / arch / powerpc / kernel / paca.c

diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index 999bdd816769ba1f63fbf332f2dc0e224630a410..5d1b708086bd33d9a9a26472fbdfedccfd93e6d1 100644 (file)
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -25,6 +25,28 @@
  * field correctly */
 extern unsigned long __toc_start;
 
+/*
+ * iSeries structure which the hypervisor knows about - this structure
+ * should not cross a page boundary.  The vpa_init/register_vpa call
+ * is now known to fail if the lppaca structure crosses a page
+ * boundary.  The lppaca is also used on POWER5 pSeries boxes.  The
+ * lppaca is 640 bytes long, and cannot readily change since the
+ * hypervisor knows its layout, so a 1kB alignment will suffice to
+ * ensure that it doesn't cross a page boundary.
+ */
+struct lppaca lppaca[] = {
+       [0 ... (NR_CPUS-1)] = {
+               .desc = 0xd397d781,     /* "LpPa" */
+               .size = sizeof(struct lppaca),
+               .dyn_proc_status = 2,
+               .decr_val = 0x00ff0000,
+               .fpregs_in_use = 1,
+               .end_of_quantum = 0xfffffffffffffffful,
+               .slb_count = 64,
+               .vmxregs_in_use = 0,
+       },
+};
+
 /* The Paca is an array with one entry per processor.  Each contains an
  * lppaca, which contains the information shared between the
  * hypervisor and Linux.
@@ -35,27 +57,17 @@ extern unsigned long __toc_start;
  * processor (not thread).
  */
 #define PACA_INIT_COMMON(number, start, asrr, asrv)                        \
+       .lppaca_ptr = &lppaca[number],                                      \
        .lock_token = 0x8000,                                               \
        .paca_index = (number),         /* Paca Index */                    \
        .kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL,             \
        .stab_real = (asrr),            /* Real pointer to segment table */ \
        .stab_addr = (asrv),            /* Virt pointer to segment table */ \
        .cpu_start = (start),           /* Processor start */               \
-       .hw_cpu_id = 0xffff,                                                \
-       .lppaca = {                                                         \
-               .desc = 0xd397d781,     /* "LpPa" */                        \
-               .size = sizeof(struct lppaca),                              \
-               .dyn_proc_status = 2,                                       \
-               .decr_val = 0x00ff0000,                                     \
-               .fpregs_in_use = 1,                                         \
-               .end_of_quantum = 0xfffffffffffffffful,                     \
-               .slb_count = 64,                                            \
-               .vmxregs_in_use = 0,                                        \
-       },                                                                  \
+       .hw_cpu_id = 0xffff,
 
 #ifdef CONFIG_PPC_ISERIES
 #define PACA_INIT_ISERIES(number)                                          \
-       .lppaca_ptr = &paca[number].lppaca,                                 \
        .reg_save_ptr = &iseries_reg_save[number],
 
 #define PACA_INIT(number)                                                  \