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SubjectRe: swsusp: Remove arch-specific references from generic code
Date
Hi,

On Saturday, 19 of March 2005 23:07, Pavel Machek wrote:
> Hi!
>
> Do you think you could just send me diff between 2.6.12-rc1 and your
> tree? I'll merge it here.

Sure, no problem, the diff follows. :-) It contains the following changes:

- remove swsusp_restore() (with the fix to return 0 from swsusp_arch_resume() on x86*)
- drop SUSPEND_PD_PAGES and pagedir_order
- fix possible memory leaks in swsusp_suspend()

The original patches are also attached in case you need them (they all apply to
2.6.12-rc1).

Please let me know if that's ok.

Greets,
Rafael


diff -Nrup linux-2.6.12-rc1/arch/i386/power/swsusp.S linux-2.6.12-rc1-new/arch/i386/power/swsusp.S
--- linux-2.6.12-rc1/arch/i386/power/swsusp.S 2005-03-20 00:36:44.000000000 +0100
+++ linux-2.6.12-rc1-new/arch/i386/power/swsusp.S 2005-03-20 00:38:13.000000000 +0100
@@ -51,6 +51,15 @@ copy_loop:
.p2align 4,,7

done:
+ /* Flush TLB, including "global" things (vmalloc) */
+ movl mmu_cr4_features, %eax
+ movl %eax, %edx
+ andl $~(1<<7), %edx; # PGE
+ movl %edx, %cr4; # turn off PGE
+ movl %cr3, %ecx; # flush TLB
+ movl %ecx, %cr3
+ movl %eax, %cr4; # turn PGE back on
+
movl saved_context_esp, %esp
movl saved_context_ebp, %ebp
movl saved_context_ebx, %ebx
@@ -58,5 +67,7 @@ done:
movl saved_context_edi, %edi

pushl saved_context_eflags ; popfl
- call swsusp_restore
+
+ xorl %eax, %eax
+
ret
diff -Nrup linux-2.6.12-rc1/arch/x86_64/kernel/suspend_asm.S linux-2.6.12-rc1-new/arch/x86_64/kernel/suspend_asm.S
--- linux-2.6.12-rc1/arch/x86_64/kernel/suspend_asm.S 2005-03-20 00:36:45.000000000 +0100
+++ linux-2.6.12-rc1-new/arch/x86_64/kernel/suspend_asm.S 2005-03-20 00:38:14.000000000 +0100
@@ -69,12 +69,21 @@ loop:
movq pbe_next(%rdx), %rdx
jmp loop
done:
+ /* Flush TLB, including "global" things (vmalloc) */
+ movq mmu_cr4_features(%rip), %rax
+ movq %rax, %rdx
+ andq $~(1<<7), %rdx; # PGE
+ movq %rdx, %cr4; # turn off PGE
+ movq %cr3, %rcx; # flush TLB
+ movq %rcx, %cr3
+ movq %rax, %cr4; # turn PGE back on
+
movl $24, %eax
movl %eax, %ds

movq saved_context_esp(%rip), %rsp
movq saved_context_ebp(%rip), %rbp
- movq saved_context_eax(%rip), %rax
+ /* Don't restore %rax, it must be 0 anyway */
movq saved_context_ebx(%rip), %rbx
movq saved_context_ecx(%rip), %rcx
movq saved_context_edx(%rip), %rdx
@@ -89,5 +98,7 @@ done:
movq saved_context_r14(%rip), %r14
movq saved_context_r15(%rip), %r15
pushq saved_context_eflags(%rip) ; popfq
- call swsusp_restore
+
+ xorq %rax, %rax
+
ret
diff -Nrup linux-2.6.12-rc1/include/linux/suspend.h linux-2.6.12-rc1-new/include/linux/suspend.h
--- linux-2.6.12-rc1/include/linux/suspend.h 2005-03-20 00:36:55.000000000 +0100
+++ linux-2.6.12-rc1-new/include/linux/suspend.h 2005-03-20 00:38:53.000000000 +0100
@@ -34,8 +34,6 @@ typedef struct pbe {
#define SWAP_FILENAME_MAXLENGTH 32


-#define SUSPEND_PD_PAGES(x) (((x)*sizeof(struct pbe))/PAGE_SIZE+1)
-
extern dev_t swsusp_resume_device;

/* mm/vmscan.c */
diff -Nrup linux-2.6.12-rc1/kernel/power/swsusp.c linux-2.6.12-rc1-new/kernel/power/swsusp.c
--- linux-2.6.12-rc1/kernel/power/swsusp.c 2005-03-20 00:37:04.000000000 +0100
+++ linux-2.6.12-rc1-new/kernel/power/swsusp.c 2005-03-20 00:38:53.000000000 +0100
@@ -98,7 +98,6 @@ unsigned int nr_copy_pages __nosavedata
*/
suspend_pagedir_t *pagedir_nosave __nosavedata = NULL;
static suspend_pagedir_t *pagedir_save;
-static int pagedir_order __nosavedata = 0;

#define SWSUSP_SIG "S1SUSPEND"

@@ -894,28 +893,21 @@ int swsusp_suspend(void)
*/
if ((error = device_power_down(PMSG_FREEZE))) {
local_irq_enable();
+ swsusp_free();
return error;
}
save_processor_state();
- error = swsusp_arch_suspend();
+ if ((error = swsusp_arch_suspend()))
+ swsusp_free();
/* Restore control flow magically appears here */
restore_processor_state();
+ BUG_ON (nr_copy_pages_check != nr_copy_pages);
restore_highmem();
device_power_up();
local_irq_enable();
return error;
}

-
-asmlinkage int swsusp_restore(void)
-{
- BUG_ON (nr_copy_pages_check != nr_copy_pages);
-
- /* Even mappings of "global" things (vmalloc) need to be fixed */
- __flush_tlb_global();
- return 0;
-}
-
int swsusp_resume(void)
{
int error;
@@ -1219,7 +1211,6 @@ static int check_header(void)
return -EPERM;
}
nr_copy_pages = swsusp_info.image_pages;
- pagedir_order = get_bitmask_order(SUSPEND_PD_PAGES(nr_copy_pages));
return error;
}

--
- Would you tell me, please, which way I ought to go from here?
- That depends a good deal on where you want to get to.
-- Lewis Carroll "Alice's Adventures in Wonderland"
diff -Nrup linux-2.6.12-rc1/arch/i386/power/swsusp.S linux-2.6.12-rc1-new/arch/i386/power/swsusp.S
--- linux-2.6.12-rc1/arch/i386/power/swsusp.S 2005-03-20 00:36:44.000000000 +0100
+++ linux-2.6.12-rc1-new/arch/i386/power/swsusp.S 2005-03-20 00:38:13.000000000 +0100
@@ -51,6 +51,15 @@ copy_loop:
.p2align 4,,7

done:
+ /* Flush TLB, including "global" things (vmalloc) */
+ movl mmu_cr4_features, %eax
+ movl %eax, %edx
+ andl $~(1<<7), %edx; # PGE
+ movl %edx, %cr4; # turn off PGE
+ movl %cr3, %ecx; # flush TLB
+ movl %ecx, %cr3
+ movl %eax, %cr4; # turn PGE back on
+
movl saved_context_esp, %esp
movl saved_context_ebp, %ebp
movl saved_context_ebx, %ebx
@@ -58,5 +67,7 @@ done:
movl saved_context_edi, %edi

pushl saved_context_eflags ; popfl
- call swsusp_restore
+
+ xorl %eax, %eax
+
ret
diff -Nrup linux-2.6.12-rc1/arch/x86_64/kernel/suspend_asm.S linux-2.6.12-rc1-new/arch/x86_64/kernel/suspend_asm.S
--- linux-2.6.12-rc1/arch/x86_64/kernel/suspend_asm.S 2005-03-20 00:36:45.000000000 +0100
+++ linux-2.6.12-rc1-new/arch/x86_64/kernel/suspend_asm.S 2005-03-20 00:38:14.000000000 +0100
@@ -69,12 +69,21 @@ loop:
movq pbe_next(%rdx), %rdx
jmp loop
done:
+ /* Flush TLB, including "global" things (vmalloc) */
+ movq mmu_cr4_features(%rip), %rax
+ movq %rax, %rdx
+ andq $~(1<<7), %rdx; # PGE
+ movq %rdx, %cr4; # turn off PGE
+ movq %cr3, %rcx; # flush TLB
+ movq %rcx, %cr3
+ movq %rax, %cr4; # turn PGE back on
+
movl $24, %eax
movl %eax, %ds

movq saved_context_esp(%rip), %rsp
movq saved_context_ebp(%rip), %rbp
- movq saved_context_eax(%rip), %rax
+ /* Don't restore %rax, it must be 0 anyway */
movq saved_context_ebx(%rip), %rbx
movq saved_context_ecx(%rip), %rcx
movq saved_context_edx(%rip), %rdx
@@ -89,5 +98,7 @@ done:
movq saved_context_r14(%rip), %r14
movq saved_context_r15(%rip), %r15
pushq saved_context_eflags(%rip) ; popfq
- call swsusp_restore
+
+ xorq %rax, %rax
+
ret
diff -Nrup linux-2.6.12-rc1/kernel/power/swsusp.c linux-2.6.12-rc1-new/kernel/power/swsusp.c
--- linux-2.6.12-rc1/kernel/power/swsusp.c 2005-03-20 00:37:04.000000000 +0100
+++ linux-2.6.12-rc1-new/kernel/power/swsusp.c 2005-03-20 01:10:19.000000000 +0100
@@ -900,22 +900,13 @@ int swsusp_suspend(void)
error = swsusp_arch_suspend();
/* Restore control flow magically appears here */
restore_processor_state();
+ BUG_ON (nr_copy_pages_check != nr_copy_pages);
restore_highmem();
device_power_up();
local_irq_enable();
return error;
}

-
-asmlinkage int swsusp_restore(void)
-{
- BUG_ON (nr_copy_pages_check != nr_copy_pages);
-
- /* Even mappings of "global" things (vmalloc) need to be fixed */
- __flush_tlb_global();
- return 0;
-}
-
int swsusp_resume(void)
{
int error;diff -Nrup linux-2.6.12-rc1/include/linux/suspend.h linux-2.6.12-rc1-a/include/linux/suspend.h
--- linux-2.6.12-rc1/include/linux/suspend.h 2005-03-18 18:50:15.000000000 +0100
+++ linux-2.6.12-rc1-a/include/linux/suspend.h 2005-03-18 18:58:27.000000000 +0100
@@ -34,8 +34,6 @@ typedef struct pbe {
#define SWAP_FILENAME_MAXLENGTH 32


-#define SUSPEND_PD_PAGES(x) (((x)*sizeof(struct pbe))/PAGE_SIZE+1)
-
extern dev_t swsusp_resume_device;

/* mm/vmscan.c */
diff -Nrup linux-2.6.12-rc1/kernel/power/swsusp.c linux-2.6.12-rc1-a/kernel/power/swsusp.c
--- linux-2.6.12-rc1/kernel/power/swsusp.c 2005-03-18 18:50:18.000000000 +0100
+++ linux-2.6.12-rc1-a/kernel/power/swsusp.c 2005-03-18 18:59:46.000000000 +0100
@@ -98,7 +98,6 @@ unsigned int nr_copy_pages __nosavedata
*/
suspend_pagedir_t *pagedir_nosave __nosavedata = NULL;
static suspend_pagedir_t *pagedir_save;
-static int pagedir_order __nosavedata = 0;

#define SWSUSP_SIG "S1SUSPEND"

@@ -1219,7 +1218,6 @@ static int check_header(void)
return -EPERM;
}
nr_copy_pages = swsusp_info.image_pages;
- pagedir_order = get_bitmask_order(SUSPEND_PD_PAGES(nr_copy_pages));
return error;
}
--- linux-2.6.12-rc1-a/kernel/power/swsusp.c 2005-03-19 11:51:02.000000000 +0100
+++ linux-2.6.12-rc1-b/kernel/power/swsusp.c 2005-03-19 15:16:56.000000000 +0100
@@ -894,10 +894,12 @@ int swsusp_suspend(void)
*/
if ((error = device_power_down(PMSG_FREEZE))) {
local_irq_enable();
+ swsusp_free();
return error;
}
save_processor_state();
- error = swsusp_arch_suspend();
+ if ((error = swsusp_arch_suspend()))
+ swsusp_free();
/* Restore control flow magically appears here */
restore_processor_state();
BUG_ON (nr_copy_pages_check != nr_copy_pages);
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