Subject: [PATCH 39/46] arch_init: make is_zero_page accept size

From: Nigel Croxon <[email-masked]>
Date: Thu, 14 Nov 2013 22:53:15 +0100

RH-Author: Nigel Croxon <[email-masked]>
Message-id: <[email-masked]>
Patchwork-id: 55717
O-Subject: [RHEL7.0 PATCH 39/42] arch_init: make is_zero_page accept size
Bugzilla: 1011720
RH-Acked-by: Orit Wasserman <[email-masked]>
RH-Acked-by: Amit Shah <[email-masked]>
RH-Acked-by: Paolo Bonzini <[email-masked]>

Bugzilla: 1011720
https://bugzilla.redhat.com/show_bug.cgi?id=1011720

>From commit ID:
commit dc3c26a479e5bd19c1b3c04f696b8f70ad57f0b7
Author: Isaku Yamahata <[email-masked]>
Date:   Sat Sep 21 01:23:36 2013 +0900

    arch_init: make is_zero_page accept size

    Later is_zero_page will be used for non TARGET_PAGE_SIZE
    range.
    And rename it to is_zero_range as it isn't page size any more.

    Signed-off-by: Isaku Yamahata <[email-masked]>
    Signed-off-by: Juan Quintela <[email-masked]>
---
 arch_init.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

Signed-off-by: Michal Novotny <[email-masked]>
---
 arch_init.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch_init.c b/arch_init.c
index 26d0374..5ce9c61 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -150,10 +150,9 @@ int qemu_read_default_config_files(bool userconfig)
     return 0;
 }
 
-static inline bool is_zero_page(uint8_t *p)
+static inline bool is_zero_range(uint8_t *p, uint64_t size)
 {
-    return buffer_find_nonzero_offset(p, TARGET_PAGE_SIZE) ==
-        TARGET_PAGE_SIZE;
+    return buffer_find_nonzero_offset(p, size) == size;
 }
 
 /* struct contains XBZRLE cache and a static page
@@ -497,7 +496,7 @@ static int ram_save_block(QEMUFile *f, bool last_stage)
                         acct_info.dup_pages++;
                     }
                 }
-            } else if (is_zero_page(p)) {
+            } else if (is_zero_range(p, TARGET_PAGE_SIZE)) {
                 acct_info.dup_pages++;
                 bytes_sent = save_block_hdr(f, block, offset, cont,
                                             RAM_SAVE_FLAG_COMPRESS);
@@ -849,7 +848,7 @@ static inline void *host_from_stream_offset(QEMUFile *f,
  */
 void ram_handle_compressed(void *host, uint8_t ch, uint64_t size)
 {
-    if (ch != 0 || !is_zero_page(host)) {
+    if (ch != 0 || !is_zero_range(host, TARGET_PAGE_SIZE)) {
         memset(host, ch, size);
 #ifndef _WIN32
         if (ch == 0 &&
-- 
1.7.11.7