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Message-Id: <20170818112624.24991-5-ard.biesheuvel@linaro.org>
Date: Fri, 18 Aug 2017 12:26:22 +0100
From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
To: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>,
"H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Kees Cook <keescook@...omium.org>,
Will Deacon <will.deacon@....com>,
Michael Ellerman <mpe@...erman.id.au>,
Thomas Garnier <thgarnie@...gle.com>,
Thomas Gleixner <tglx@...utronix.de>,
"Serge E. Hallyn" <serge@...lyn.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Catalin Marinas <catalin.marinas@....com>,
Petr Mladek <pmladek@...e.com>, Ingo Molnar <mingo@...hat.com>,
James Morris <james.l.morris@...cle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Joe Perches <joe@...ches.com>, Nicolas Pitre <nico@...aro.org>,
Steven Rostedt <rostedt@...dmis.org>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andy Whitcroft <apw@...onical.com>,
Jessica Yu <jeyu@...nel.org>
Subject: [PATCH v2 4/6] init: allow initcall tables to be emitted using relative references
Allow the initcall tables to be emitted using relative references that
are only half the size on 64-bit architectures and don't require fixups
at runtime on relocatable kernels.
Cc: Petr Mladek <pmladek@...e.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: James Morris <james.l.morris@...cle.com>
Cc: "Serge E. Hallyn" <serge@...lyn.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
---
include/linux/init.h | 64 ++++++++++++++++----
init/main.c | 22 ++-----
kernel/printk/printk.c | 4 +-
security/security.c | 6 +-
4 files changed, 62 insertions(+), 34 deletions(-)
diff --git a/include/linux/init.h b/include/linux/init.h
index 94769d687cf0..61022aec47ea 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -110,9 +110,6 @@
typedef int (*initcall_t)(void);
typedef void (*exitcall_t)(void);
-extern initcall_t __con_initcall_start[], __con_initcall_end[];
-extern initcall_t __security_initcall_start[], __security_initcall_end[];
-
/* Used for contructor calls. */
typedef void (*ctor_fn_t)(void);
@@ -161,9 +158,57 @@ extern bool initcall_debug;
* as KEEP() in the linker script.
*/
-#define __define_initcall(fn, id) \
+#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
+#define ___define_initcall(fn, id, __sec) \
+ __ADDRESSABLE(fn) \
+ asm(".section \"" #__sec ".init\", \"a\"\n" \
+ "__initcall_" #fn #id ":\n" \
+ ".long " VMLINUX_SYMBOL_STR(fn) " - .\n" \
+ ".previous\n")
+
+struct initcall_entry_t {
+ int offset;
+};
+
+static inline
+initcall_t initcall_from_entry(const struct initcall_entry_t *entry)
+{
+ return (initcall_t)((unsigned long)entry + entry->offset);
+}
+#else
+#define ___define_initcall(fn, id, __sec) \
static initcall_t __initcall_##fn##id __used \
- __attribute__((__section__(".initcall" #id ".init"))) = fn;
+ __attribute__((__section__(#__sec ".init"))) = fn
+
+struct initcall_entry_t {
+ initcall_t call;
+};
+
+static inline
+initcall_t initcall_from_entry(const struct initcall_entry_t *entry)
+{
+ return entry->call;
+}
+#endif
+
+extern struct initcall_entry_t __initcall_start[];
+extern struct initcall_entry_t __initcall0_start[];
+extern struct initcall_entry_t __initcall1_start[];
+extern struct initcall_entry_t __initcall2_start[];
+extern struct initcall_entry_t __initcall3_start[];
+extern struct initcall_entry_t __initcall4_start[];
+extern struct initcall_entry_t __initcall5_start[];
+extern struct initcall_entry_t __initcall6_start[];
+extern struct initcall_entry_t __initcall7_start[];
+extern struct initcall_entry_t __initcall_end[];
+
+extern struct initcall_entry_t __con_initcall_start[];
+extern struct initcall_entry_t __con_initcall_end[];
+
+extern struct initcall_entry_t __security_initcall_start[];
+extern struct initcall_entry_t __security_initcall_end[];
+
+#define __define_initcall(fn, id) ___define_initcall(fn, id, .initcall##id)
/*
* Early initcalls run before initializing SMP.
@@ -202,13 +247,8 @@ extern bool initcall_debug;
#define __exitcall(fn) \
static exitcall_t __exitcall_##fn __exit_call = fn
-#define console_initcall(fn) \
- static initcall_t __initcall_##fn \
- __used __section(.con_initcall.init) = fn
-
-#define security_initcall(fn) \
- static initcall_t __initcall_##fn \
- __used __section(.security_initcall.init) = fn
+#define console_initcall(fn) ___define_initcall(fn,, .con_initcall)
+#define security_initcall(fn) ___define_initcall(fn,, .security_initcall)
struct obs_kernel_param {
const char *str;
diff --git a/init/main.c b/init/main.c
index 052481fbe363..174a68ee85c4 100644
--- a/init/main.c
+++ b/init/main.c
@@ -832,19 +832,7 @@ int __init_or_module do_one_initcall(initcall_t fn)
return ret;
}
-
-extern initcall_t __initcall_start[];
-extern initcall_t __initcall0_start[];
-extern initcall_t __initcall1_start[];
-extern initcall_t __initcall2_start[];
-extern initcall_t __initcall3_start[];
-extern initcall_t __initcall4_start[];
-extern initcall_t __initcall5_start[];
-extern initcall_t __initcall6_start[];
-extern initcall_t __initcall7_start[];
-extern initcall_t __initcall_end[];
-
-static initcall_t *initcall_levels[] __initdata = {
+static struct initcall_entry_t *initcall_levels[] __initdata = {
__initcall0_start,
__initcall1_start,
__initcall2_start,
@@ -870,7 +858,7 @@ static char *initcall_level_names[] __initdata = {
static void __init do_initcall_level(int level)
{
- initcall_t *fn;
+ struct initcall_entry_t *fn;
strcpy(initcall_command_line, saved_command_line);
parse_args(initcall_level_names[level],
@@ -880,7 +868,7 @@ static void __init do_initcall_level(int level)
NULL, &repair_env_string);
for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
- do_one_initcall(*fn);
+ do_one_initcall(initcall_from_entry(fn));
}
static void __init do_initcalls(void)
@@ -911,10 +899,10 @@ static void __init do_basic_setup(void)
static void __init do_pre_smp_initcalls(void)
{
- initcall_t *fn;
+ struct initcall_entry_t *fn;
for (fn = __initcall_start; fn < __initcall0_start; fn++)
- do_one_initcall(*fn);
+ do_one_initcall(initcall_from_entry(fn));
}
/*
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index fc47863f629c..95a964592dc6 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2623,7 +2623,7 @@ EXPORT_SYMBOL(unregister_console);
*/
void __init console_init(void)
{
- initcall_t *call;
+ struct initcall_entry_t *call;
/* Setup the default TTY line discipline. */
n_tty_init();
@@ -2634,7 +2634,7 @@ void __init console_init(void)
*/
call = __con_initcall_start;
while (call < __con_initcall_end) {
- (*call)();
+ initcall_from_entry(call)();
call++;
}
}
diff --git a/security/security.c b/security/security.c
index 30132378d103..e878b6f5ce9c 100644
--- a/security/security.c
+++ b/security/security.c
@@ -44,10 +44,10 @@ static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
static void __init do_security_initcalls(void)
{
- initcall_t *call;
- call = __security_initcall_start;
+ struct initcall_entry_t *call = __security_initcall_start;
+
while (call < __security_initcall_end) {
- (*call) ();
+ initcall_from_entry(call)();
call++;
}
}
--
2.11.0
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