Pull sn2-reduce-kmalloc-wrap into release branch

3 files changed, 85 insertions, 46 deletions

diff --git a/arch/ia64/sn/kernel/xpc_channel.c b/arch/ia64/sn/kernel/xpc_channel.c
index cdf6856ce089..d0abddd9ffe6 100644
--- a/arch/ia64/sn/kernel/xpc_channel.c
+++ b/arch/ia64/sn/kernel/xpc_channel.c
@@ -21,7 +21,6 @@
 #include <linux/sched.h>
 #include <linux/cache.h>
 #include <linux/interrupt.h>
-#include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/completion.h>
 #include <asm/sn/bte.h>
@@ -30,6 +29,31 @@
 
 
 /*
+ * Guarantee that the kzalloc'd memory is cacheline aligned.
+ */
+static void *
+xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
+{
+        /* see if kzalloc will give us cachline aligned memory by default */
+        *base = kzalloc(size, flags);
+        if (*base == NULL) {
+                return NULL;
+        }
+        if ((u64) *base == L1_CACHE_ALIGN((u64) *base)) {
+                return *base;
+        }
+        kfree(*base);
+
+        /* nope, we'll have to do it ourselves */
+        *base = kzalloc(size + L1_CACHE_BYTES, flags);
+        if (*base == NULL) {
+                return NULL;
+        }
+        return (void *) L1_CACHE_ALIGN((u64) *base);
+}
+
+
+/*
  * Set up the initial values for the XPartition Communication channels.
  */
 static void
@@ -93,20 +117,19 @@ xpc_setup_infrastructure(struct xpc_partition *part)
          * Allocate all of the channel structures as a contiguous chunk of
          * memory.
          */
-        part->channels = kmalloc(sizeof(struct xpc_channel) * XPC_NCHANNELS,
+        part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_NCHANNELS,
                                                                 GFP_KERNEL);
         if (part->channels == NULL) {
                 dev_err(xpc_chan, "can't get memory for channels\n");
                 return xpcNoMemory;
         }
-        memset(part->channels, 0, sizeof(struct xpc_channel) * XPC_NCHANNELS);
 
         part->nchannels = XPC_NCHANNELS;
 
 
         /* allocate all the required GET/PUT values */
 
-        part->local_GPs = xpc_kmalloc_cacheline_aligned(XPC_GP_SIZE,
+        part->local_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE,
                                         GFP_KERNEL, &part->local_GPs_base);
         if (part->local_GPs == NULL) {
                 kfree(part->channels);
@@ -115,55 +138,51 @@ xpc_setup_infrastructure(struct xpc_partition *part)
                         "values\n");
                 return xpcNoMemory;
         }
-        memset(part->local_GPs, 0, XPC_GP_SIZE);
 
-        part->remote_GPs = xpc_kmalloc_cacheline_aligned(XPC_GP_SIZE,
+        part->remote_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE,
                                         GFP_KERNEL, &part->remote_GPs_base);
         if (part->remote_GPs == NULL) {
-                kfree(part->channels);
-                part->channels = NULL;
-                kfree(part->local_GPs_base);
-                part->local_GPs = NULL;
                 dev_err(xpc_chan, "can't get memory for remote get/put "
                         "values\n");
+                kfree(part->local_GPs_base);
+                part->local_GPs = NULL;
+                kfree(part->channels);
+                part->channels = NULL;
                 return xpcNoMemory;
         }
-        memset(part->remote_GPs, 0, XPC_GP_SIZE);
 
 
         /* allocate all the required open and close args */
 
-        part->local_openclose_args = xpc_kmalloc_cacheline_aligned(
+        part->local_openclose_args = xpc_kzalloc_cacheline_aligned(
                                         XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
                                         &part->local_openclose_args_base);
         if (part->local_openclose_args == NULL) {
-                kfree(part->channels);
-                part->channels = NULL;
-                kfree(part->local_GPs_base);
-                part->local_GPs = NULL;
+                dev_err(xpc_chan, "can't get memory for local connect args\n");
                 kfree(part->remote_GPs_base);
                 part->remote_GPs = NULL;
-                dev_err(xpc_chan, "can't get memory for local connect args\n");
+                kfree(part->local_GPs_base);
+                part->local_GPs = NULL;
+                kfree(part->channels);
+                part->channels = NULL;
                 return xpcNoMemory;
         }
-        memset(part->local_openclose_args, 0, XPC_OPENCLOSE_ARGS_SIZE);
 
-        part->remote_openclose_args = xpc_kmalloc_cacheline_aligned(
+        part->remote_openclose_args = xpc_kzalloc_cacheline_aligned(
                                         XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
                                         &part->remote_openclose_args_base);
         if (part->remote_openclose_args == NULL) {
-                kfree(part->channels);
-                part->channels = NULL;
-                kfree(part->local_GPs_base);
-                part->local_GPs = NULL;
-                kfree(part->remote_GPs_base);
-                part->remote_GPs = NULL;
+                dev_err(xpc_chan, "can't get memory for remote connect args\n");
                 kfree(part->local_openclose_args_base);
                 part->local_openclose_args = NULL;
-                dev_err(xpc_chan, "can't get memory for remote connect args\n");
+                kfree(part->remote_GPs_base);
+                part->remote_GPs = NULL;
+                kfree(part->local_GPs_base);
+                part->local_GPs = NULL;
+                kfree(part->channels);
+                part->channels = NULL;
                 return xpcNoMemory;
         }
-        memset(part->remote_openclose_args, 0, XPC_OPENCLOSE_ARGS_SIZE);
 
 
         xpc_initialize_channels(part, partid);
@@ -186,18 +205,18 @@ xpc_setup_infrastructure(struct xpc_partition *part)
         ret = request_irq(SGI_XPC_NOTIFY, xpc_notify_IRQ_handler, SA_SHIRQ,
                                 part->IPI_owner, (void *) (u64) partid);
         if (ret != 0) {
-                kfree(part->channels);
-                part->channels = NULL;
-                kfree(part->local_GPs_base);
-                part->local_GPs = NULL;
-                kfree(part->remote_GPs_base);
-                part->remote_GPs = NULL;
-                kfree(part->local_openclose_args_base);
-                part->local_openclose_args = NULL;
-                kfree(part->remote_openclose_args_base);
-                part->remote_openclose_args = NULL;
                 dev_err(xpc_chan, "can't register NOTIFY IRQ handler, "
                         "errno=%d\n", -ret);
+                kfree(part->remote_openclose_args_base);
+                part->remote_openclose_args = NULL;
+                kfree(part->local_openclose_args_base);
+                part->local_openclose_args = NULL;
+                kfree(part->remote_GPs_base);
+                part->remote_GPs = NULL;
+                kfree(part->local_GPs_base);
+                part->local_GPs = NULL;
+                kfree(part->channels);
+                part->channels = NULL;
                 return xpcLackOfResources;
         }
 
@@ -446,22 +465,20 @@ xpc_allocate_local_msgqueue(struct xpc_channel *ch)
         for (nentries = ch->local_nentries; nentries > 0; nentries--) {
 
                 nbytes = nentries * ch->msg_size;
-                ch->local_msgqueue = xpc_kmalloc_cacheline_aligned(nbytes,
+                ch->local_msgqueue = xpc_kzalloc_cacheline_aligned(nbytes,
                                                 GFP_KERNEL,
                                                 &ch->local_msgqueue_base);
                 if (ch->local_msgqueue == NULL) {
                         continue;
                 }
-                memset(ch->local_msgqueue, 0, nbytes);
 
                 nbytes = nentries * sizeof(struct xpc_notify);
-                ch->notify_queue = kmalloc(nbytes, GFP_KERNEL);
+                ch->notify_queue = kzalloc(nbytes, GFP_KERNEL);
                 if (ch->notify_queue == NULL) {
                         kfree(ch->local_msgqueue_base);
                         ch->local_msgqueue = NULL;
                         continue;
                 }
-                memset(ch->notify_queue, 0, nbytes);
 
                 spin_lock_irqsave(&ch->lock, irq_flags);
                 if (nentries < ch->local_nentries) {
@@ -501,13 +518,12 @@ xpc_allocate_remote_msgqueue(struct xpc_channel *ch)
         for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
 
                 nbytes = nentries * ch->msg_size;
-                ch->remote_msgqueue = xpc_kmalloc_cacheline_aligned(nbytes,
+                ch->remote_msgqueue = xpc_kzalloc_cacheline_aligned(nbytes,
                                                 GFP_KERNEL,
                                                 &ch->remote_msgqueue_base);
                 if (ch->remote_msgqueue == NULL) {
                         continue;
                 }
-                memset(ch->remote_msgqueue, 0, nbytes);
 
                 spin_lock_irqsave(&ch->lock, irq_flags);
                 if (nentries < ch->remote_nentries) {
diff --git a/arch/ia64/sn/kernel/xpc_main.c b/arch/ia64/sn/kernel/xpc_main.c
index 8cbf16432570..99b123a6421a 100644
--- a/arch/ia64/sn/kernel/xpc_main.c
+++ b/arch/ia64/sn/kernel/xpc_main.c
@@ -52,7 +52,6 @@
 #include <linux/syscalls.h>
 #include <linux/cache.h>
 #include <linux/interrupt.h>
-#include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/reboot.h>
 #include <linux/completion.h>
diff --git a/arch/ia64/sn/kernel/xpc_partition.c b/arch/ia64/sn/kernel/xpc_partition.c
index 88a730e6cfdb..94211429fd0c 100644
--- a/arch/ia64/sn/kernel/xpc_partition.c
+++ b/arch/ia64/sn/kernel/xpc_partition.c
@@ -81,6 +81,31 @@ char ____cacheline_aligned xpc_remote_copy_buffer[XPC_RP_HEADER_SIZE +
 
 
 /*
+ * Guarantee that the kmalloc'd memory is cacheline aligned.
+ */
+static void *
+xpc_kmalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
+{
+        /* see if kmalloc will give us cachline aligned memory by default */
+        *base = kmalloc(size, flags);
+        if (*base == NULL) {
+                return NULL;
+        }
+        if ((u64) *base == L1_CACHE_ALIGN((u64) *base)) {
+                return *base;
+        }
+        kfree(*base);
+
+        /* nope, we'll have to do it ourselves */
+        *base = kmalloc(size + L1_CACHE_BYTES, flags);
+        if (*base == NULL) {
+                return NULL;
+        }
+        return (void *) L1_CACHE_ALIGN((u64) *base);
+}
+
+
+/*
  * Given a nasid, get the physical address of the  partition's reserved page
  * for that nasid. This function returns 0 on any error.
  */
@@ -1038,13 +1063,12 @@ xpc_discovery(void)
         remote_vars = (struct xpc_vars *) remote_rp;
 
 
-        discovered_nasids = kmalloc(sizeof(u64) * xp_nasid_mask_words,
+        discovered_nasids = kzalloc(sizeof(u64) * xp_nasid_mask_words,
                                                         GFP_KERNEL);
         if (discovered_nasids == NULL) {
                 kfree(remote_rp_base);
                 return;
         }
-        memset(discovered_nasids, 0, sizeof(u64) * xp_nasid_mask_words);
 
         rp = (struct xpc_rsvd_page *) xpc_rsvd_page;