[PATCH 08/16] procfs: remove CONFIG_HARDWALL dependency

[PATCH 08/16] procfs: remove CONFIG_HARDWALL dependency

[Arnd Bergmann]

Hardwall is a tile specific feature, and with the removal of the
tile architecture, this has become dead code, so let's remove it.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 fs/proc/base.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 9298324325ed..d53246863cfb 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -94,9 +94,6 @@
 #include <linux/sched/stat.h>
 #include <linux/flex_array.h>
 #include <linux/posix-timers.h>
-#ifdef CONFIG_HARDWALL
-#include <asm/hardwall.h>
-#endif
 #include <trace/events/oom.h>
 #include "internal.h"
 #include "fd.h"
@@ -3002,9 +2999,6 @@ static const struct pid_entry tgid_base_stuff[] = {
 #ifdef CONFIG_TASK_IO_ACCOUNTING
 	ONE("io",	S_IRUSR, proc_tgid_io_accounting),
 #endif
-#ifdef CONFIG_HARDWALL
-	ONE("hardwall",   S_IRUGO, proc_pid_hardwall),
-#endif
 #ifdef CONFIG_USER_NS
 	REG("uid_map",    S_IRUGO|S_IWUSR, proc_uid_map_operations),
 	REG("gid_map",    S_IRUGO|S_IWUSR, proc_gid_map_operations),
@@ -3393,9 +3387,6 @@ static const struct pid_entry tid_base_stuff[] = {
 #ifdef CONFIG_TASK_IO_ACCOUNTING
 	ONE("io",	S_IRUSR, proc_tid_io_accounting),
 #endif
-#ifdef CONFIG_HARDWALL
-	ONE("hardwall",   S_IRUGO, proc_pid_hardwall),
-#endif
 #ifdef CONFIG_USER_NS
 	REG("uid_map",    S_IRUGO|S_IWUSR, proc_uid_map_operations),
 	REG("gid_map",    S_IRUGO|S_IWUSR, proc_gid_map_operations),
-- 
2.9.0

[PATCH 09/16] mm: remove blackfin MPU support

[Arnd Bergmann]

The CONFIG_MPU option was only defined on blackfin, and that architecture
is now being removed, so the respective code can be simplified.

A lot of other microcontrollers have an MPU, but I suspect that if we
want to bring that support back, we'd do it differently anyway.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 kernel/module.c |  4 ----
 mm/nommu.c      | 20 --------------------
 2 files changed, 24 deletions(-)

diff --git a/kernel/module.c b/kernel/module.c
index ad2d420024f6..2c1df850029b 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2181,10 +2181,6 @@ static void free_module(struct module *mod)
 	/* Finally, free the core (containing the module structure) */
 	disable_ro_nx(&mod->core_layout);
 	module_memfree(mod->core_layout.base);
-
-#ifdef CONFIG_MPU
-	update_protections(current->mm);
-#endif
 }
 
 void *__symbol_get(const char *symbol)
diff --git a/mm/nommu.c b/mm/nommu.c
index ebb6e618dade..838a8fdec5c2 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -663,22 +663,6 @@ static void put_nommu_region(struct vm_region *region)
 }
 
 /*
- * update protection on a vma
- */
-static void protect_vma(struct vm_area_struct *vma, unsigned long flags)
-{
-#ifdef CONFIG_MPU
-	struct mm_struct *mm = vma->vm_mm;
-	long start = vma->vm_start & PAGE_MASK;
-	while (start < vma->vm_end) {
-		protect_page(mm, start, flags);
-		start += PAGE_SIZE;
-	}
-	update_protections(mm);
-#endif
-}
-
-/*
  * add a VMA into a process's mm_struct in the appropriate place in the list
  * and tree and add to the address space's page tree also if not an anonymous
  * page
@@ -695,8 +679,6 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
 	mm->map_count++;
 	vma->vm_mm = mm;
 
-	protect_vma(vma, vma->vm_flags);
-
 	/* add the VMA to the mapping */
 	if (vma->vm_file) {
 		mapping = vma->vm_file->f_mapping;
@@ -757,8 +739,6 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
 	struct mm_struct *mm = vma->vm_mm;
 	struct task_struct *curr = current;
 
-	protect_vma(vma, 0);
-
 	mm->map_count--;
 	for (i = 0; i < VMACACHE_SIZE; i++) {
 		/* if the vma is cached, invalidate the entire cache */
-- 
2.9.0

Re: [PATCH 08/16] procfs: remove CONFIG_HARDWALL dependency

[Alexey Dobriyan]

On Wed, Mar 14, 2018 at 03:37:37PM +0100, Arnd Bergmann wrote:
> Hardwall is a tile specific feature, and with the removal of the
> tile architecture, this has become dead code, so let's remove it.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

ACK

Although it should go via tile tree for "atomicity".

Re: [PATCH 08/16] procfs: remove CONFIG_HARDWALL dependency

[Arnd Bergmann]

On Wed, Mar 14, 2018 at 6:41 PM, Alexey Dobriyan <adobriyan@gmail.com> wrote:
> On Wed, Mar 14, 2018 at 03:37:37PM +0100, Arnd Bergmann wrote:
>> Hardwall is a tile specific feature, and with the removal of the
>> tile architecture, this has become dead code, so let's remove it.
>>
>> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
>
> ACK
>
> Although it should go via tile tree for "atomicity".

Both the arch/tile removal and this patch are in my asm-generic tree, as there
is no longer a tile specific git.

Thanks for your Ack!

       Arnd