[PATCH RFC 6/6] xen/keyhandler: Drop keyhandler_scratch

[Andrew Cooper <andrew.cooper3@citrix.com>]

With almost all users of keyhandler_scratch gone, clean up the 3 remaining
users and drop the buffer.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Wei Liu <wei.liu2@citrix.com>
CC: Roger Pau Monné <roger.pau@citrix.com>

The NUMA and periodic timer adjustments are definitely improvements.  However,
this is RFC because of the EFI change, which might perhaps not wan to be done
this way.  Suggestions welcome.
---
 xen/arch/x86/numa.c          | 11 ++++-------
 xen/common/efi/boot.c        |  5 ++---
 xen/common/keyhandler.c      | 26 +++++++-------------------
 xen/include/xen/keyhandler.h |  3 ---
 4 files changed, 13 insertions(+), 32 deletions(-)

diff --git a/xen/arch/x86/numa.c b/xen/arch/x86/numa.c
index a87987d..de13aca 100644
--- a/xen/arch/x86/numa.c
+++ b/xen/arch/x86/numa.c
@@ -372,7 +372,6 @@ static void dump_numa(unsigned char key)
 {
     s_time_t now = NOW();
     unsigned int i, j, n;
-    int err;
     struct domain *d;
     struct page_info *page;
     unsigned int page_num_node[MAX_NUMNODES];
@@ -454,12 +453,10 @@ static void dump_numa(unsigned char key)
         {
             unsigned int start_cpu = ~0U;
 
-            err = snprintf(keyhandler_scratch, 12, "%3u",
-                    vnuma->vnode_to_pnode[i]);
-            if ( err < 0 || vnuma->vnode_to_pnode[i] == NUMA_NO_NODE )
-                strlcpy(keyhandler_scratch, "???", sizeof(keyhandler_scratch));
-
-            printk("       %3u: pnode %s,", i, keyhandler_scratch);
+            if ( vnuma->vnode_to_pnode[i] == NUMA_NO_NODE )
+                printk("       %3u: pnode ???,", i);
+            else
+                printk("       %3u: pnode %3u,", i, vnuma->vnode_to_pnode[i]);
 
             printk(" vcpus ");
 
diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index 2f49731..aa9a666 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -489,7 +489,7 @@ static EFI_FILE_HANDLE __init get_parent_handle(EFI_LOADED_IMAGE *loaded_image,
     static EFI_GUID __initdata fs_protocol = SIMPLE_FILE_SYSTEM_PROTOCOL;
     EFI_FILE_HANDLE dir_handle;
     EFI_DEVICE_PATH *dp;
-    CHAR16 *pathend, *ptr;
+    CHAR16 *pathend, *ptr, buffer[128];
     EFI_STATUS ret;
 
     do {
@@ -506,8 +506,7 @@ static EFI_FILE_HANDLE __init get_parent_handle(EFI_LOADED_IMAGE *loaded_image,
     if ( ret != EFI_SUCCESS )
         PrintErrMesg(L"OpenVolume failure", ret);
 
-#define buffer ((CHAR16 *)keyhandler_scratch)
-#define BUFFERSIZE sizeof(keyhandler_scratch)
+#define BUFFERSIZE sizeof(buffer)
     for ( dp = loaded_image->FilePath, *buffer = 0;
           DevicePathType(dp) != END_DEVICE_PATH_TYPE;
           dp = (void *)dp + DevicePathNodeLength(dp) )
diff --git a/xen/common/keyhandler.c b/xen/common/keyhandler.c
index 93ae738..64e5783 100644
--- a/xen/common/keyhandler.c
+++ b/xen/common/keyhandler.c
@@ -29,8 +29,6 @@ static keyhandler_fn_t show_handlers, dump_hwdom_registers,
 static irq_keyhandler_fn_t do_toggle_alt_key, dump_registers,
     reboot_machine, run_all_keyhandlers, do_debug_key;
 
-char keyhandler_scratch[1024];
-
 static struct keyhandler {
     union {
         keyhandler_fn_t *fn;
@@ -250,25 +248,11 @@ static void reboot_machine(unsigned char key, struct cpu_user_regs *regs)
     machine_restart(0);
 }
 
-static void periodic_timer_print(char *str, int size, uint64_t period)
-{
-    if ( period == 0 )
-    {
-        strlcpy(str, "No periodic timer", size);
-        return;
-    }
-
-    snprintf(str, size,
-             "%u Hz periodic timer (period %u ms)",
-             1000000000/(int)period, (int)period/1000000);
-}
-
 static void dump_domains(unsigned char key)
 {
     struct domain *d;
     struct vcpu   *v;
     s_time_t       now = NOW();
-#define tmpstr keyhandler_scratch
 
     printk("'%c' pressed -> dumping domain info (now=0x%X:%08X)\n", key,
            (u32)(now>>32), (u32)now);
@@ -333,8 +317,13 @@ static void dump_domains(unsigned char key)
             printk("    pause_count=%d pause_flags=%lx\n",
                    atomic_read(&v->pause_count), v->pause_flags);
             arch_dump_vcpu_info(v);
-            periodic_timer_print(tmpstr, sizeof(tmpstr), v->periodic_period);
-            printk("    %s\n", tmpstr);
+
+            if ( v->periodic_period == 0 )
+                printk("No periodic timer\n");
+            else
+                printk("%u Hz periodic timer (period %u ms)\n",
+                       1000000000/(int)v->periodic_period,
+                       (int)v->periodic_period/1000000);
         }
     }
 
@@ -355,7 +344,6 @@ static void dump_domains(unsigned char key)
     arch_dump_shared_mem_info();
 
     rcu_read_unlock(&domlist_read_lock);
-#undef tmpstr
 }
 
 static cpumask_t read_clocks_cpumask;
diff --git a/xen/include/xen/keyhandler.h b/xen/include/xen/keyhandler.h
index 06c05c8..5131e86 100644
--- a/xen/include/xen/keyhandler.h
+++ b/xen/include/xen/keyhandler.h
@@ -48,7 +48,4 @@ void register_irq_keyhandler(unsigned char key,
 /* Inject a keypress into the key-handling subsystem. */
 extern void handle_keypress(unsigned char key, struct cpu_user_regs *regs);
 
-/* Scratch space is available for use of any keyhandler. */
-extern char keyhandler_scratch[1024];
-
 #endif /* __XEN_KEYHANDLER_H__ */
-- 
2.1.4


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