The patch titled
exec_domain: establish a Linux32 domain on CONFIG_COMPAT systems
has been removed from the -mm tree. Its filename was
exec_domain-establish-a-linux32-domain-on-config_compat-systems.patch
This patch was dropped because it was withdrawn
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: exec_domain: establish a Linux32 domain on CONFIG_COMPAT systems
From: David Daney <ddaney@xxxxxxxxxxxxxxxxxx>
If PER_LINUX32 is set calling sys_personality, we will try to find the
corresponding exec_domain. This causes us to try to load a module for
personality-8. After running the userspace module loader and failing to
find the module, we fall back to the default.
We can avoid the failed module loading overhead by building-in the
linux32_exec_domain for systems that have CONFIG_COMPAT.
I noticed this on MIPS64 systems, but it is a general problem and applies
to x86 among others. Admittedly sys_personality() is probably not in the
hot path of many programs, but the overhead of the extra exec_domain is
fairly small.
Signed-off-by: David Daney <ddaney@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Kyle McMartin <kyle@xxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: "James E.J. Bottomley" <jejb@xxxxxxxxxxxxxxxx>
Cc: Chris Metcalf <cmetcalf@xxxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: "Luck, Tony" <tony.luck@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/exec_domain.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff -puN kernel/exec_domain.c~exec_domain-establish-a-linux32-domain-on-config_compat-systems kernel/exec_domain.c
--- a/kernel/exec_domain.c~exec_domain-establish-a-linux32-domain-on-config_compat-systems
+++ a/kernel/exec_domain.c
@@ -34,6 +34,17 @@ static unsigned long ident_map[32] = {
24, 25, 26, 27, 28, 29, 30, 31
};
+#ifdef CONFIG_COMPAT
+static struct exec_domain linux32_exec_domain = {
+ .name = "Linux32", /* name */
+ .handler = default_handler, /* lcall7 causes a seg fault. */
+ .pers_low = PER_LINUX32,
+ .pers_high = PER_LINUX32,
+ .signal_map = ident_map, /* Identity map signals. */
+ .signal_invmap = ident_map, /* - both ways. */
+};
+#endif
+
struct exec_domain default_exec_domain = {
.name = "Linux", /* name */
.handler = default_handler, /* lcall7 causes a seg fault. */
@@ -41,6 +52,9 @@ struct exec_domain default_exec_domain =
.pers_high = 0, /* PER_LINUX personality. */
.signal_map = ident_map, /* Identity map signals. */
.signal_invmap = ident_map, /* - both ways. */
+#ifdef CONFIG_COMPAT
+ .next = &linux32_exec_domain,
+#endif
};
_
Patches currently in -mm which might be from ddaney@xxxxxxxxxxxxxxxxxx are
linux-next.patch
binfmt_elf-quiet-gcc-46-set-but-not-used-warning-in-load_elf_binary.patch
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