FEX-Emu/linux
1
0
Fork 0
mirror of https://github.com/FEX-Emu/linux.git synced 2024-12-11 18:26:02 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

mm: remove vmalloc_sync_(un)mappings()

Browse Source 
These functions are not needed anymore because the vmalloc and ioremap
mappings are now synchronized when they are created or torn down.

Remove all callers and function definitions.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Link: http://lkml.kernel.org/r/20200515140023.25469-7-joro@8bytes.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joerg Roedel 2020-06-01 21:52:36 -07:00 committed by Linus Torvalds
parent 86cf69f1d8
commit 73f693c3a7
7 changed files with 0 additions and 91 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
arch/x86/mm/fault.c
View File

@ -214,26 +214,6 @@ void arch_sync_kernel_mappings(unsigned long start, unsigned long end)
}
}
static void vmalloc_sync(void)
{
unsigned long address;
if (SHARED_KERNEL_PMD)
return;
arch_sync_kernel_mappings(VMALLOC_START, VMALLOC_END);
}
void vmalloc_sync_mappings(void)
{
vmalloc_sync();
}
void vmalloc_sync_unmappings(void)
{
vmalloc_sync();
}
/*
* 32-bit:
*
@ -336,23 +316,6 @@ out:
#else /* CONFIG_X86_64: */
void vmalloc_sync_mappings(void)
{
/*
* 64-bit mappings might allocate new p4d/pud pages
* that need to be propagated to all tasks' PGDs.
*/
sync_global_pgds(VMALLOC_START & PGDIR_MASK, VMALLOC_END);
}
void vmalloc_sync_unmappings(void)
{
/*
* Unmappings never allocate or free p4d/pud pages.
* No work is required here.
*/
}
/*
* 64-bit:
*

6
drivers/acpi/apei/ghes.c
View File

@ -167,12 +167,6 @@ int ghes_estatus_pool_init(int num_ghes)
if (!addr)
goto err_pool_alloc;
/*
* New allocation must be visible in all pgd before it can be found by
* an NMI allocating from the pool.
*/
vmalloc_sync_mappings();
rc = gen_pool_add(ghes_estatus_pool, addr, PAGE_ALIGN(len), -1);
if (rc)
goto err_pool_add;

2
include/linux/vmalloc.h
View File

@ -130,8 +130,6 @@ extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
unsigned long pgoff);
void vmalloc_sync_mappings(void);
void vmalloc_sync_unmappings(void);
/*
* Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values

1
kernel/notifier.c
View File

@ -519,7 +519,6 @@ NOKPROBE_SYMBOL(notify_die);
int register_die_notifier(struct notifier_block *nb)
{
vmalloc_sync_mappings();
return atomic_notifier_chain_register(&die_chain, nb);
}
EXPORT_SYMBOL_GPL(register_die_notifier);

12
kernel/trace/trace.c
View File

@ -8527,18 +8527,6 @@ static int allocate_trace_buffers(struct trace_array *tr, int size)
allocate_snapshot = false;
#endif
/*
* Because of some magic with the way alloc_percpu() works on
* x86_64, we need to synchronize the pgd of all the tables,
* otherwise the trace events that happen in x86_64 page fault
* handlers can't cope with accessing the chance that a
* alloc_percpu()'d memory might be touched in the page fault trace
* event. Oh, and we need to audit all other alloc_percpu() and vmalloc()
* calls in tracing, because something might get triggered within a
* page fault trace event!
*/
vmalloc_sync_mappings();
return 0;
}

12
mm/nommu.c
View File

@ -371,18 +371,6 @@ void vm_unmap_aliases(void)
}
EXPORT_SYMBOL_GPL(vm_unmap_aliases);
/*
* Implement a stub for vmalloc_sync_[un]mapping() if the architecture
* chose not to have one.
*/
void __weak vmalloc_sync_mappings(void)
{
}
void __weak vmalloc_sync_unmappings(void)
{
}
struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes)
{
BUG();

21
mm/vmalloc.c
View File

@ -1353,12 +1353,6 @@ static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end)
if (unlikely(valist == NULL))
return false;
/*
* First make sure the mappings are removed from all page-tables
* before they are freed.
*/
vmalloc_sync_unmappings();
/*
* TODO: to calculate a flush range without looping.
* The list can be up to lazy_max_pages() elements.
@ -3089,21 +3083,6 @@ int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
}
EXPORT_SYMBOL(remap_vmalloc_range);
/*
* Implement stubs for vmalloc_sync_[un]mappings () if the architecture chose
* not to have one.
*
* The purpose of this function is to make sure the vmalloc area
* mappings are identical in all page-tables in the system.
*/
void __weak vmalloc_sync_mappings(void)
{
}
void __weak vmalloc_sync_unmappings(void)
{
}
static int f(pte_t *pte, unsigned long addr, void *data)
{
pte_t ***p = data;