Merge tag 'powerpc-5.3-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "Some more powerpc fixes for 5.3:

   - Wire up the new clone3 syscall.

   - A fix for the PAPR SCM nvdimm driver, to fix a crash when firmware
     gives us a device that's attached to a non-online NUMA node.

   - A fix for a boot failure on 32-bit with KASAN enabled.

   - Three fixes for implicit fall through warnings, some of which are
     errors for us due to -Werror.

  Thanks to: Aneesh Kumar K.V, Christophe Leroy, Kees Cook, Santosh
  Sivaraj, Stephen Rothwell"

* tag 'powerpc-5.3-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/kasan: fix early boot failure on PPC32
  drivers/macintosh/smu.c: Mark expected switch fall-through
  powerpc/spe: Mark expected switch fall-throughs
  powerpc/nvdimm: Pick nearby online node if the device node is not online
  powerpc/kvm: Fall through switch case explicitly
  powerpc: Wire up clone3 syscall

9 files changed, 53 insertions, 5 deletions

diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
index 68473c3c471c..b0720c7c3fcf 100644
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
@@ -49,6 +49,7 @@
 #define __ARCH_WANT_SYS_FORK
 #define __ARCH_WANT_SYS_VFORK
 #define __ARCH_WANT_SYS_CLONE
+#define __ARCH_WANT_SYS_CLONE3
 
 #endif          /* __ASSEMBLY__ */
 #endif /* _ASM_POWERPC_UNISTD_H_ */
diff --git a/arch/powerpc/kernel/align.c b/arch/powerpc/kernel/align.c
index 7107ad86de65..92045ed64976 100644
--- a/arch/powerpc/kernel/align.c
+++ b/arch/powerpc/kernel/align.c
@@ -176,9 +176,11 @@ static int emulate_spe(struct pt_regs *regs, unsigned int reg,
                         ret |= __get_user_inatomic(temp.v[1], p++);
                         ret |= __get_user_inatomic(temp.v[2], p++);
                         ret |= __get_user_inatomic(temp.v[3], p++);
+                        /* fall through */
                 case 4:
                         ret |= __get_user_inatomic(temp.v[4], p++);
                         ret |= __get_user_inatomic(temp.v[5], p++);
+                        /* fall through */
                 case 2:
                         ret |= __get_user_inatomic(temp.v[6], p++);
                         ret |= __get_user_inatomic(temp.v[7], p++);
@@ -259,9 +261,11 @@ static int emulate_spe(struct pt_regs *regs, unsigned int reg,
                         ret |= __put_user_inatomic(data.v[1], p++);
                         ret |= __put_user_inatomic(data.v[2], p++);
                         ret |= __put_user_inatomic(data.v[3], p++);
+                        /* fall through */
                 case 4:
                         ret |= __put_user_inatomic(data.v[4], p++);
                         ret |= __put_user_inatomic(data.v[5], p++);
+                        /* fall through */
                 case 2:
                         ret |= __put_user_inatomic(data.v[6], p++);
                         ret |= __put_user_inatomic(data.v[7], p++);
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 85fdb6d879f1..54fab22c9a43 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -597,6 +597,14 @@ ppc_clone:
         stw     r0,_TRAP(r1)            /* register set saved */
         b       sys_clone
 
+        .globl  ppc_clone3
+ppc_clone3:
+        SAVE_NVGPRS(r1)
+        lwz     r0,_TRAP(r1)
+        rlwinm  r0,r0,0,0,30            /* clear LSB to indicate full */
+        stw     r0,_TRAP(r1)            /* register set saved */
+        b       sys_clone3
+
         .globl  ppc_swapcontext
 ppc_swapcontext:
         SAVE_NVGPRS(r1)
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index d9105fcf4021..0a0b5310f54a 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -487,6 +487,11 @@ _GLOBAL(ppc_clone)
         bl      sys_clone
         b       .Lsyscall_exit
 
+_GLOBAL(ppc_clone3)
+       bl      save_nvgprs
+       bl      sys_clone3
+       b       .Lsyscall_exit
+
 _GLOBAL(ppc32_swapcontext)
         bl      save_nvgprs
         bl      compat_sys_swapcontext
diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
index 3331749aab20..43f736ed47f2 100644
--- a/arch/powerpc/kernel/syscalls/syscall.tbl
+++ b/arch/powerpc/kernel/syscalls/syscall.tbl
@@ -516,4 +516,4 @@
 432     common  fsmount                         sys_fsmount
 433     common  fspick                          sys_fspick
 434     common  pidfd_open                      sys_pidfd_open
-# 435 reserved for clone3
+435     nospu   clone3                          ppc_clone3
diff --git a/arch/powerpc/kvm/book3s_32_mmu.c b/arch/powerpc/kvm/book3s_32_mmu.c
index 653936177857..18f244aad7aa 100644
--- a/arch/powerpc/kvm/book3s_32_mmu.c
+++ b/arch/powerpc/kvm/book3s_32_mmu.c
@@ -239,6 +239,7 @@ static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
                                 case 2:
                                 case 6:
                                         pte->may_write = true;
+                                        /* fall through */
                                 case 3:
                                 case 5:
                                 case 7:
diff --git a/arch/powerpc/mm/kasan/kasan_init_32.c b/arch/powerpc/mm/kasan/kasan_init_32.c
index 0d62be3cba47..74f4555a62ba 100644
--- a/arch/powerpc/mm/kasan/kasan_init_32.c
+++ b/arch/powerpc/mm/kasan/kasan_init_32.c
@@ -21,7 +21,7 @@ static void kasan_populate_pte(pte_t *ptep, pgprot_t prot)
                 __set_pte_at(&init_mm, va, ptep, pfn_pte(PHYS_PFN(pa), prot), 0);
 }
 
-static int kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_end)
+static int __ref kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_end)
 {
         pmd_t *pmd;
         unsigned long k_cur, k_next;
@@ -35,7 +35,10 @@ static int kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_
                 if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte)
                         continue;
 
-                new = pte_alloc_one_kernel(&init_mm);
+                if (slab_is_available())
+                        new = pte_alloc_one_kernel(&init_mm);
+                else
+                        new = memblock_alloc(PTE_FRAG_SIZE, PTE_FRAG_SIZE);
 
                 if (!new)
                         return -ENOMEM;
diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
index 2c07908359b2..a5ac371a3f06 100644
--- a/arch/powerpc/platforms/pseries/papr_scm.c
+++ b/arch/powerpc/platforms/pseries/papr_scm.c
@@ -275,12 +275,32 @@ static const struct attribute_group *papr_scm_dimm_groups[] = {
         NULL,
 };
 
+static inline int papr_scm_node(int node)
+{
+        int min_dist = INT_MAX, dist;
+        int nid, min_node;
+
+        if ((node == NUMA_NO_NODE) || node_online(node))
+                return node;
+
+        min_node = first_online_node;
+        for_each_online_node(nid) {
+                dist = node_distance(node, nid);
+                if (dist < min_dist) {
+                        min_dist = dist;
+                        min_node = nid;
+                }
+        }
+        return min_node;
+}
+
 static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
 {
         struct device *dev = &p->pdev->dev;
         struct nd_mapping_desc mapping;
         struct nd_region_desc ndr_desc;
         unsigned long dimm_flags;
+        int target_nid, online_nid;
 
         p->bus_desc.ndctl = papr_scm_ndctl;
         p->bus_desc.module = THIS_MODULE;
@@ -319,8 +339,10 @@ static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
 
         memset(&ndr_desc, 0, sizeof(ndr_desc));
         ndr_desc.attr_groups = region_attr_groups;
-        ndr_desc.numa_node = dev_to_node(&p->pdev->dev);
-        ndr_desc.target_node = ndr_desc.numa_node;
+        target_nid = dev_to_node(&p->pdev->dev);
+        online_nid = papr_scm_node(target_nid);
+        ndr_desc.numa_node = online_nid;
+        ndr_desc.target_node = target_nid;
         ndr_desc.res = &p->res;
         ndr_desc.of_node = p->dn;
         ndr_desc.provider_data = p;
@@ -338,6 +360,9 @@ static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
                                 ndr_desc.res, p->dn);
                 goto err;
         }
+        if (target_nid != online_nid)
+                dev_info(dev, "Region registered with target node %d and online node %d",
+                         target_nid, online_nid);
 
         return 0;
 
diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c
index 276065c888bc..23f1f41c8602 100644
--- a/drivers/macintosh/smu.c
+++ b/drivers/macintosh/smu.c
@@ -852,6 +852,7 @@ int smu_queue_i2c(struct smu_i2c_cmd *cmd)
                 break;
         case SMU_I2C_TRANSFER_COMBINED:
                 cmd->info.devaddr &= 0xfe;
+                /* fall through */
         case SMU_I2C_TRANSFER_STDSUB:
                 if (cmd->info.sublen > 3)
                         return -EINVAL;