pack: make packed_git_mru global a value instead of a pointer

The MRU cache that keeps track of recently used packs is represented
using two global variables:

struct mru packed_git_mru_storage;
struct mru *packed_git_mru = &packed_git_mru_storage;

Callers never assign to the packed_git_mru pointer, though, so we can
simplify by eliminating it and using &packed_git_mru_storage (renamed
to &packed_git_mru) directly.  This variable is only used by the
packfile subsystem, making this a relatively uninvasive change (and
any new unadapted callers would trigger a compile error).

Noticed while moving these globals to the object_store struct.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Acked-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index a57b4f058dff3ceec80355560bf6a856f130b8c0..f721137eaf88143aa2ae3f8c67b97fbceccbb6cf 100644 (file)
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -1012,7 +1012,7 @@ static int want_object_in_pack(const unsigned char *sha1,
                        return want;
        }
 
-       for (entry = packed_git_mru->head; entry; entry = entry->next) {
+       for (entry = packed_git_mru.head; entry; entry = entry->next) {
                struct packed_git *p = entry->item;
                off_t offset;
 
@@ -1030,7 +1030,7 @@ static int want_object_in_pack(const unsigned char *sha1,
                        }
                        want = want_found_object(exclude, p);
                        if (!exclude && want > 0)
-                               mru_mark(packed_git_mru, entry);
+                               mru_mark(&packed_git_mru, entry);
                        if (want != -1)
                                return want;
                }

diff --git a/cache.h b/cache.h
index a916bc79e3c1a77f55764f34f6357478e83b6cb0..49b083ee0a10ea379f271e141ccee0fa852a1954 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -4,6 +4,7 @@
 #include "git-compat-util.h"
 #include "strbuf.h"
 #include "hashmap.h"
+#include "mru.h"
 #include "advice.h"
 #include "gettext.h"
 #include "convert.h"
@@ -1589,8 +1590,7 @@ extern struct packed_git {
  * A most-recently-used ordered version of the packed_git list, which can
  * be iterated instead of packed_git (and marked via mru_mark).
  */
-struct mru;
-extern struct mru *packed_git_mru;
+extern struct mru packed_git_mru;
 
 struct pack_entry {
        off_t offset;

diff --git a/packfile.c b/packfile.c
index f86fa051c9e67def994b8b487ad34f200967d5e9..f69a5c8d607af191fa8ba04e84da8f02c40823ef 100644 (file)
--- a/packfile.c
+++ b/packfile.c
@@ -40,9 +40,7 @@ static unsigned int pack_max_fds;
 static size_t peak_pack_mapped;
 static size_t pack_mapped;
 struct packed_git *packed_git;
-
-static struct mru packed_git_mru_storage;
-struct mru *packed_git_mru = &packed_git_mru_storage;
+struct mru packed_git_mru;
 
 #define SZ_FMT PRIuMAX
 static inline uintmax_t sz_fmt(size_t s) { return s; }
@@ -861,9 +859,9 @@ static void prepare_packed_git_mru(void)
 {
        struct packed_git *p;
 
-       mru_clear(packed_git_mru);
+       mru_clear(&packed_git_mru);
        for (p = packed_git; p; p = p->next)
-               mru_append(packed_git_mru, p);
+               mru_append(&packed_git_mru, p);
 }
 
 static int prepare_packed_git_run_once = 0;
@@ -1832,9 +1830,9 @@ int find_pack_entry(const unsigned char *sha1, struct pack_entry *e)
        if (!packed_git)
                return 0;
 
-       for (p = packed_git_mru->head; p; p = p->next) {
+       for (p = packed_git_mru.head; p; p = p->next) {
                if (fill_pack_entry(sha1, e, p->item)) {
-                       mru_mark(packed_git_mru, p);
+                       mru_mark(&packed_git_mru, p);
                        return 1;
                }
        }