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Date: Tue, 18 Dec 2007 18:03:07 -0200
From: Glauber de Oliveira Costa <gcosta@...hat.com>
To: linux-kernel@...r.kernel.org
CC: akpm@...ux-foundation.org, glommer@...il.com, tglx@...utronix.de,
mingo@...e.hu, ehabkost@...hat.com, jeremy@...p.org,
avi@...ranet.com, anthony@...emonkey.ws,
virtualization@...ts.linux-foundation.org, rusty@...tcorp.com.au,
ak@...e.de, chrisw@...s-sol.org, rostedt@...dmis.org,
hpa@...or.com, zach@...are.com, roland@...hat.com
Subject: Re: [PATCH 2/2] finish processor.h integration
Glauber de Oliveira Costa wrote:
> What's left in processor_32.h and processor_64.h cannot be cleanly
> integrated. However, it's just a couple of definitions. They are moved
> to processor.h around ifdefs, and the original files are deleted. Note that
> there's much less headers included in the final version.
>
> Signed-off-by: Glauber de Oliveira Costa <gcosta@...hat.com>
> ---
> include/asm-x86/processor.h | 128 +++++++++++++++++++++++++++++++++++++++-
> include/asm-x86/processor_32.h | 97 ------------------------------
> include/asm-x86/processor_64.h | 66 --------------------
> 3 files changed, 126 insertions(+), 165 deletions(-)
> delete mode 100644 include/asm-x86/processor_32.h
> delete mode 100644 include/asm-x86/processor_64.h
>
> diff --git a/include/asm-x86/processor.h b/include/asm-x86/processor.h
> index 80c5002..decb740 100644
> --- a/include/asm-x86/processor.h
> +++ b/include/asm-x86/processor.h
> @@ -11,6 +11,8 @@ struct mm_struct;
> #include <asm/percpu.h>
> #include <asm/system.h>
> #include <asm/percpu.h>
> +#include <asm/msr.h>
> +#include <asm/desc_defs.h>
> #include <linux/cpumask.h>
> #include <linux/cache.h>
>
> @@ -275,7 +277,11 @@ union i387_union {
> struct i387_soft_struct soft;
> };
>
> -# include "processor_32.h"
> +/*
> + * the following now lives in the per cpu area:
> + * extern int cpu_llc_id[NR_CPUS];
> + */
> +DECLARE_PER_CPU(u8, cpu_llc_id);
> #else
> struct i387_fxsave_struct {
> u16 cwd;
> @@ -295,7 +301,7 @@ union i387_union {
> struct i387_fxsave_struct fxsave;
> };
>
> -# include "processor_64.h"
> +DECLARE_PER_CPU(struct orig_ist, orig_ist);
> #endif
>
> extern void print_cpu_info(struct cpuinfo_x86 *);
> @@ -778,6 +784,124 @@ static inline void prefetchw(const void *x)
> }
>
> #define spin_lock_prefetch(x) prefetchw(x)
> +#ifdef CONFIG_X86_32
> +/*
> + * User space process size: 3GB (default).
> + */
> +#define TASK_SIZE (PAGE_OFFSET)
> +
> +#define INIT_THREAD { \
> + .sp0 = sizeof(init_stack) + (long)&init_stack, \
> + .vm86_info = NULL, \
> + .sysenter_cs = __KERNEL_CS, \
> + .io_bitmap_ptr = NULL, \
> + .fs = __KERNEL_PERCPU, \
> +}
> +
> +/*
> + * Note that the .io_bitmap member must be extra-big. This is because
> + * the CPU will access an additional byte beyond the end of the IO
> + * permission bitmap. The extra byte must be all 1 bits, and must
> + * be within the limit.
> + */
> +#define INIT_TSS { \
> + .x86_tss = { \
> + .sp0 = sizeof(init_stack) + (long)&init_stack, \
> + .ss0 = __KERNEL_DS, \
> + .ss1 = __KERNEL_CS, \
> + .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, \
> + }, \
> + .io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 }, \
> +}
> +
> +#define start_thread(regs, new_eip, new_esp) do { \
> + __asm__("movl %0,%%gs": :"r" (0)); \
> + regs->fs = 0; \
> + set_fs(USER_DS); \
> + regs->ds = __USER_DS; \
> + regs->es = __USER_DS; \
> + regs->ss = __USER_DS; \
> + regs->cs = __USER_CS; \
> + regs->ip = new_eip; \
> + regs->sp = new_esp; \
> +} while (0)
> +
> +
> +extern unsigned long thread_saved_pc(struct task_struct *tsk);
> +
> +#define THREAD_SIZE_LONGS (THREAD_SIZE/sizeof(unsigned long))
> +#define KSTK_TOP(info) \
> +({ \
> + unsigned long *__ptr = (unsigned long *)(info); \
> + (unsigned long)(&__ptr[THREAD_SIZE_LONGS]); \
> +})
> +
> +/*
> + * The below -8 is to reserve 8 bytes on top of the ring0 stack.
> + * This is necessary to guarantee that the entire "struct pt_regs"
> + * is accessable even if the CPU haven't stored the SS/ESP registers
> + * on the stack (interrupt gate does not save these registers
> + * when switching to the same priv ring).
> + * Therefore beware: accessing the ss/esp fields of the
> + * "struct pt_regs" is possible, but they may contain the
> + * completely wrong values.
> + */
> +#define task_pt_regs(task) \
> +({ \
> + struct pt_regs *__regs__; \
> + __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \
> + __regs__ - 1; \
> +})
> +
> +#define KSTK_ESP(task) (task_pt_regs(task)->sp)
> +
> +#else
> +/*
> + * User space process size. 47bits minus one guard page.
> + */
> +#define TASK_SIZE64 (0x800000000000UL - 4096)
> +
> +/* This decides where the kernel will search for a free chunk of vm
> + * space during mmap's.
> + */
> +#define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \
> + 0xc0000000 : 0xFFFFe000)
> +
> +#define TASK_SIZE (test_thread_flag(TIF_IA32) ? \
> + IA32_PAGE_OFFSET : TASK_SIZE64)
> +#define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? \
> + IA32_PAGE_OFFSET : TASK_SIZE64)
> +
> +#define INIT_THREAD { \
> + .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
> +}
> +
> +#define INIT_TSS { \
> + .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
> +}
> +
> +#define start_thread(regs, new_rip, new_rsp) do { \
> + asm volatile("movl %0,%%fs; movl %0,%%es; movl %0,%%ds": :"r" (0)); \
> + load_gs_index(0); \
> + (regs)->ip = (new_rip); \
> + (regs)->sp = (new_rsp); \
> + write_pda(oldrsp, (new_rsp)); \
> + (regs)->cs = __USER_CS; \
> + (regs)->ss = __USER_DS; \
> + (regs)->flags = 0x200; \
> + set_fs(USER_DS); \
> +} while (0)
> +
> +/*
> + * Return saved PC of a blocked thread.
> + * What is this good for? it will be always the scheduler or ret_from_fork.
> + */
> +#define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8))
> +
> +#define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1)
> +#define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */
> +#endif /* CONFIG_X86_64 */
> +
> /* This decides where the kernel will search for a free chunk of vm
> * space during mmap's.
> */
> diff --git a/include/asm-x86/processor_32.h b/include/asm-x86/processor_32.h
> deleted file mode 100644
> index 0d6a430..0000000
> --- a/include/asm-x86/processor_32.h
> +++ /dev/null
> @@ -1,97 +0,0 @@
> -/*
> - * Copyright (C) 1994 Linus Torvalds
> - */
> -
> -#ifndef __ASM_I386_PROCESSOR_H
> -#define __ASM_I386_PROCESSOR_H
> -
> -#include <asm/vm86.h>
> -#include <asm/math_emu.h>
> -#include <asm/segment.h>
> -#include <asm/page.h>
> -#include <asm/types.h>
> -#include <asm/sigcontext.h>
> -#include <asm/cpufeature.h>
> -#include <asm/msr.h>
> -#include <asm/system.h>
> -#include <linux/threads.h>
> -#include <linux/init.h>
> -#include <asm/desc_defs.h>
> -
> -/*
> - * the following now lives in the per cpu area:
> - * extern int cpu_llc_id[NR_CPUS];
> - */
> -DECLARE_PER_CPU(u8, cpu_llc_id);
> -
> -/*
> - * User space process size: 3GB (default).
> - */
> -#define TASK_SIZE (PAGE_OFFSET)
> -
> -#define INIT_THREAD { \
> - .sp0 = sizeof(init_stack) + (long)&init_stack, \
> - .vm86_info = NULL, \
> - .sysenter_cs = __KERNEL_CS, \
> - .io_bitmap_ptr = NULL, \
> - .fs = __KERNEL_PERCPU, \
> -}
> -
> -/*
> - * Note that the .io_bitmap member must be extra-big. This is because
> - * the CPU will access an additional byte beyond the end of the IO
> - * permission bitmap. The extra byte must be all 1 bits, and must
> - * be within the limit.
> - */
> -#define INIT_TSS { \
> - .x86_tss = { \
> - .sp0 = sizeof(init_stack) + (long)&init_stack, \
> - .ss0 = __KERNEL_DS, \
> - .ss1 = __KERNEL_CS, \
> - .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, \
> - }, \
> - .io_bitmap = { [ 0 ... IO_BITMAP_LONGS] = ~0 }, \
> -}
> -
> -#define start_thread(regs, new_eip, new_esp) do { \
> - __asm__("movl %0,%%gs": :"r" (0)); \
> - regs->fs = 0; \
> - set_fs(USER_DS); \
> - regs->ds = __USER_DS; \
> - regs->es = __USER_DS; \
> - regs->ss = __USER_DS; \
> - regs->cs = __USER_CS; \
> - regs->ip = new_eip; \
> - regs->sp = new_esp; \
> -} while (0)
> -
> -
> -extern unsigned long thread_saved_pc(struct task_struct *tsk);
> -
> -#define THREAD_SIZE_LONGS (THREAD_SIZE/sizeof(unsigned long))
> -#define KSTK_TOP(info) \
> -({ \
> - unsigned long *__ptr = (unsigned long *)(info); \
> - (unsigned long)(&__ptr[THREAD_SIZE_LONGS]); \
> -})
> -
> -/*
> - * The below -8 is to reserve 8 bytes on top of the ring0 stack.
> - * This is necessary to guarantee that the entire "struct pt_regs"
> - * is accessable even if the CPU haven't stored the SS/ESP registers
> - * on the stack (interrupt gate does not save these registers
> - * when switching to the same priv ring).
> - * Therefore beware: accessing the ss/esp fields of the
> - * "struct pt_regs" is possible, but they may contain the
> - * completely wrong values.
> - */
> -#define task_pt_regs(task) \
> -({ \
> - struct pt_regs *__regs__; \
> - __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \
> - __regs__ - 1; \
> -})
> -
> -#define KSTK_ESP(task) (task_pt_regs(task)->sp)
> -
> -#endif /* __ASM_I386_PROCESSOR_H */
> diff --git a/include/asm-x86/processor_64.h b/include/asm-x86/processor_64.h
> deleted file mode 100644
> index 04ce823..0000000
> --- a/include/asm-x86/processor_64.h
> +++ /dev/null
> @@ -1,66 +0,0 @@
> -/*
> - * Copyright (C) 1994 Linus Torvalds
> - */
> -
> -#ifndef __ASM_X86_64_PROCESSOR_H
> -#define __ASM_X86_64_PROCESSOR_H
> -
> -#include <asm/segment.h>
> -#include <asm/page.h>
> -#include <asm/types.h>
> -#include <asm/sigcontext.h>
> -#include <asm/cpufeature.h>
> -#include <linux/threads.h>
> -#include <asm/msr.h>
> -#include <asm/current.h>
> -#include <asm/system.h>
> -#include <linux/personality.h>
> -#include <asm/desc_defs.h>
> -
> -/*
> - * User space process size. 47bits minus one guard page.
> - */
> -#define TASK_SIZE64 (0x800000000000UL - 4096)
> -
> -/* This decides where the kernel will search for a free chunk of vm
> - * space during mmap's.
> - */
> -#define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? 0xc0000000 : 0xFFFFe000)
> -
> -#define TASK_SIZE (test_thread_flag(TIF_IA32) ? IA32_PAGE_OFFSET : TASK_SIZE64)
> -#define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64)
> -
> -
> -
> -DECLARE_PER_CPU(struct orig_ist, orig_ist);
> -
> -#define INIT_THREAD { \
> - .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
> -}
> -
> -#define INIT_TSS { \
> - .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
> -}
> -
> -#define start_thread(regs,new_rip,new_rsp) do { \
> - asm volatile("movl %0,%%fs; movl %0,%%es; movl %0,%%ds": :"r" (0)); \
> - load_gs_index(0); \
> - (regs)->ip = (new_rip); \
> - (regs)->sp = (new_rsp); \
> - write_pda(oldrsp, (new_rsp)); \
> - (regs)->cs = __USER_CS; \
> - (regs)->ss = __USER_DS; \
> - (regs)->flags = 0x200; \
> - set_fs(USER_DS); \
> -} while(0)
> -
> -/*
> - * Return saved PC of a blocked thread.
> - * What is this good for? it will be always the scheduler or ret_from_fork.
> - */
> -#define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8))
> -
> -#define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1)
> -#define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */
> -
> -#endif /* __ASM_X86_64_PROCESSOR_H */
Okay, Ingo, this was a distraction of mine. As the patch was already
ready, I just sent out after fixing, but you are obviously right, and it
is not good even for changelog purposes. I'll send now a patch that
includes all headers deleted from 64 and 32 bit, and in the future,
remove the unused ones. The last patch is not needed, because we include
init.h here, but it's not wrong, nevertheless.
Please forget this one, and apply the one I'll send following this message.
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