From 13977091a988fb0d21821c2221ddc920eba36b79 Mon Sep 17 00:00:00 2001 From: Magnus Damm Date: Mon, 30 Mar 2009 14:37:25 -0700 Subject: Driver Core: early platform driver V3 of the early platform driver implementation. Platform drivers are great for embedded platforms because we can separate driver configuration from the actual driver. So base addresses, interrupts and other configuration can be kept with the processor or board code, and the platform driver can be reused by many different platforms. For early devices we have nothing today. For instance, to configure early timers and early serial ports we cannot use platform devices. This because the setup order during boot. Timers are needed before the platform driver core code is available. The same goes for early printk support. Early in this case means before initcalls. These early drivers today have their configuration either hard coded or they receive it using some special configuration method. This is working quite well, but if we want to support both regular kernel modules and early devices then we need to have two ways of configuring the same driver. A single way would be better. The early platform driver patch is basically a set of functions that allow drivers to register themselves and architecture code to locate them and probe. Registration happens through early_param(). The time for the probe is decided by the architecture code. See Documentation/driver-model/platform.txt for more details. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Magnus Damm Cc: Paul Mundt Cc: Kay Sievers Cc: David Brownell Cc: Tejun Heo Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- include/linux/init.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/init.h') diff --git a/include/linux/init.h b/include/linux/init.h index 68cb0265d00..f121a7a10c3 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -247,6 +247,7 @@ struct obs_kernel_param { /* Relies on boot_command_line being set */ void __init parse_early_param(void); +void __init parse_early_options(char *cmdline); #endif /* __ASSEMBLY__ */ /** -- cgit v1.2.3-70-g09d2 From c80d471a476b6d6fe0bc1fd25293c24c66b7aaaf Mon Sep 17 00:00:00 2001 From: Tim Abbott Date: Sat, 25 Apr 2009 22:10:56 -0400 Subject: Add new HEAD_TEXT_SECTION macro. This patch is preparation for replacing all uses of ".head.text" or ".text.head" in the kernel with macros, so that the section name can later be changed without having to touch a lot of the kernel. Since some linker scripts do more complex things than referencing HEAD_TEXT, we add a HEAD_TEXT_SECTION macro that just contains the actual name. I've defined HEAD_TEXT_SECTION in a new header, include/linux/section-names.h, so that this section name only needs to appear in one place. I anticipate creating similar macro structures for a number of other section names. The long-term goal here is to be able to change the kernel's magic section names to those that are compatible with -ffunction-sections -fdata-sections. This requires renaming all magic sections with names of the form ".text.foo". Signed-off-by: Tim Abbott Signed-off-by: Linus Torvalds --- include/asm-generic/vmlinux.lds.h | 4 +++- include/linux/init.h | 4 +++- include/linux/section-names.h | 6 ++++++ 3 files changed, 12 insertions(+), 2 deletions(-) create mode 100644 include/linux/section-names.h (limited to 'include/linux/init.h') diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 7fa660fd449..eaa06ef6f7d 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -1,3 +1,5 @@ +#include + #ifndef LOAD_OFFSET #define LOAD_OFFSET 0 #endif @@ -331,7 +333,7 @@ #endif /* Section used for early init (in .S files) */ -#define HEAD_TEXT *(.head.text) +#define HEAD_TEXT *(HEAD_TEXT_SECTION) /* init and exit section handling */ #define INIT_DATA \ diff --git a/include/linux/init.h b/include/linux/init.h index f121a7a10c3..20a1334e34e 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -2,6 +2,8 @@ #define _LINUX_INIT_H #include +#include +#include /* These macros are used to mark some functions or * initialized data (doesn't apply to uninitialized data) @@ -107,7 +109,7 @@ #define __memexitconst __section(.memexit.rodata) /* For assembly routines */ -#define __HEAD .section ".head.text","ax" +#define __HEAD .section __stringify(HEAD_TEXT_SECTION),"ax" #define __INIT .section ".init.text","ax" #define __FINIT .previous diff --git a/include/linux/section-names.h b/include/linux/section-names.h new file mode 100644 index 00000000000..c956f4eb2ad --- /dev/null +++ b/include/linux/section-names.h @@ -0,0 +1,6 @@ +#ifndef __LINUX_SECTION_NAMES_H +#define __LINUX_SECTION_NAMES_H + +#define HEAD_TEXT_SECTION .head.text + +#endif /* !__LINUX_SECTION_NAMES_H */ -- cgit v1.2.3-70-g09d2 From 27b1833279995e7c290a40cac4ef36ccea7e9283 Mon Sep 17 00:00:00 2001 From: Tim Abbott Date: Mon, 27 Apr 2009 14:02:27 -0400 Subject: Remove unused support code for refok sections. The old refok sections .text.init.refok .data.init.refok .exit.text.refok have been deprecated since commit 312b1485fb509c9bc32eda28ad29537896658cb8. After the other patches in this patch series nothing is put in these sections, so clean things up by eliminating all the remaining references to them. Signed-off-by: Tim Abbott Acked-by: Sam Ravnborg Signed-off-by: Linus Torvalds --- include/asm-generic/vmlinux.lds.h | 3 --- include/linux/init.h | 8 -------- scripts/mod/modpost.c | 18 ------------------ 3 files changed, 29 deletions(-) (limited to 'include/linux/init.h') diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index eaa06ef6f7d..89853bcd27a 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -90,7 +90,6 @@ /* .data section */ #define DATA_DATA \ *(.data) \ - *(.data.init.refok) \ *(.ref.data) \ DEV_KEEP(init.data) \ DEV_KEEP(exit.data) \ @@ -289,8 +288,6 @@ *(.text.hot) \ *(.text) \ *(.ref.text) \ - *(.text.init.refok) \ - *(.exit.text.refok) \ DEV_KEEP(init.text) \ DEV_KEEP(exit.text) \ CPU_KEEP(init.text) \ diff --git a/include/linux/init.h b/include/linux/init.h index 20a1334e34e..0e06c176f18 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -62,14 +62,6 @@ #define __refdata __section(.ref.data) #define __refconst __section(.ref.rodata) -/* backward compatibility note - * A few places hardcode the old section names: - * .text.init.refok - * .data.init.refok - * .exit.text.refok - * They should be converted to use the defines from this file - */ - /* compatibility defines */ #define __init_refok __ref #define __initdata_refok __refdata diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index df6e6286a06..8d46ea7d671 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -794,15 +794,6 @@ static const char *init_exit_sections[] = /* data section */ static const char *data_sections[] = { DATA_SECTIONS, NULL }; -/* sections that may refer to an init/exit section with no warning */ -static const char *initref_sections[] = -{ - ".text.init.refok*", - ".exit.text.refok*", - ".data.init.refok*", - NULL -}; - /* symbols in .data that may refer to init/exit sections */ static const char *symbol_white_list[] = @@ -915,11 +906,6 @@ static int section_mismatch(const char *fromsec, const char *tosec) /** * Whitelist to allow certain references to pass with no warning. * - * Pattern 0: - * Do not warn if funtion/data are marked with __init_refok/__initdata_refok. - * The pattern is identified by: - * fromsec = .text.init.refok* | .data.init.refok* - * * Pattern 1: * If a module parameter is declared __initdata and permissions=0 * then this is legal despite the warning generated. @@ -958,10 +944,6 @@ static int section_mismatch(const char *fromsec, const char *tosec) static int secref_whitelist(const char *fromsec, const char *fromsym, const char *tosec, const char *tosym) { - /* Check for pattern 0 */ - if (match(fromsec, initref_sections)) - return 0; - /* Check for pattern 1 */ if (match(tosec, init_data_sections) && match(fromsec, data_sections) && -- cgit v1.2.3-70-g09d2