The patch titled
Subject: mm/vmalloc: remove map_kernel_range
has been added to the -mm tree. Its filename is
mm-vmalloc-remove-map_kernel_range.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-vmalloc-remove-map_kernel_range.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-vmalloc-remove-map_kernel_range.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Nicholas Piggin <npiggin@xxxxxxxxx>
Subject: mm/vmalloc: remove map_kernel_range
Patch series "mm/vmalloc: cleanup after hugepage series", v2.
Christoph pointed out some overdue cleanups required after the huge
vmalloc series, and I had another failure error message improvement as
well.
This patch (of 5):
This is a shim around vmap_pages_range, get rid of it.
Move the main API comment from the _noflush variant to the normal variant,
and make _noflush internal to mm/.
Link: https://lkml.kernel.org/r/20210322021806.892164-1-npiggin@xxxxxxxxx
Link: https://lkml.kernel.org/r/20210322021806.892164-2-npiggin@xxxxxxxxx
Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: Uladzislau Rezki <urezki@xxxxxxxxx>
Cc: Cédric Le Goater <clg@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/core-api/cachetlb.rst | 2
include/linux/vmalloc.h | 11 ----
mm/internal.h | 6 ++
mm/percpu-vm.c | 5 +-
mm/vmalloc.c | 65 +++++++++++---------------
5 files changed, 38 insertions(+), 51 deletions(-)
--- a/Documentation/core-api/cachetlb.rst~mm-vmalloc-remove-map_kernel_range
+++ a/Documentation/core-api/cachetlb.rst
@@ -213,7 +213,7 @@ Here are the routines, one by one:
there will be no entries in the cache for the kernel address
space for virtual addresses in the range 'start' to 'end-1'.
- The first of these two routines is invoked after map_kernel_range()
+ The first of these two routines is invoked after vmap_range()
has installed the page table entries. The second is invoked
before unmap_kernel_range() deletes the page table entries.
--- a/include/linux/vmalloc.h~mm-vmalloc-remove-map_kernel_range
+++ a/include/linux/vmalloc.h
@@ -212,10 +212,6 @@ static inline bool is_vm_area_hugepages(
int vmap_range(unsigned long addr, unsigned long end,
phys_addr_t phys_addr, pgprot_t prot,
unsigned int max_page_shift);
-extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
- pgprot_t prot, struct page **pages);
-int map_kernel_range(unsigned long start, unsigned long size, pgprot_t prot,
- struct page **pages);
extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
extern void unmap_kernel_range(unsigned long addr, unsigned long size);
static inline void set_vm_flush_reset_perms(void *addr)
@@ -227,13 +223,6 @@ static inline void set_vm_flush_reset_pe
}
#else
-static inline int
-map_kernel_range_noflush(unsigned long start, unsigned long size,
- pgprot_t prot, struct page **pages)
-{
- return size >> PAGE_SHIFT;
-}
-#define map_kernel_range map_kernel_range_noflush
static inline void
unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
{
--- a/mm/internal.h~mm-vmalloc-remove-map_kernel_range
+++ a/mm/internal.h
@@ -638,4 +638,10 @@ struct migration_target_control {
gfp_t gfp_mask;
};
+/*
+ * mm/vmalloc.c
+ */
+int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
+ pgprot_t prot, struct page **pages, unsigned int page_shift);
+
#endif /* __MM_INTERNAL_H */
--- a/mm/percpu-vm.c~mm-vmalloc-remove-map_kernel_range
+++ a/mm/percpu-vm.c
@@ -8,6 +8,7 @@
* Chunks are mapped into vmalloc areas and populated page by page.
* This is the default chunk allocator.
*/
+#include "internal.h"
static struct page *pcpu_chunk_page(struct pcpu_chunk *chunk,
unsigned int cpu, int page_idx)
@@ -192,8 +193,8 @@ static void pcpu_post_unmap_tlb_flush(st
static int __pcpu_map_pages(unsigned long addr, struct page **pages,
int nr_pages)
{
- return map_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT,
- PAGE_KERNEL, pages);
+ return vmap_pages_range_noflush(addr, addr + (nr_pages << PAGE_SHIFT),
+ PAGE_KERNEL, pages, PAGE_SHIFT);
}
/**
--- a/mm/vmalloc.c~mm-vmalloc-remove-map_kernel_range
+++ a/mm/vmalloc.c
@@ -523,7 +523,16 @@ static int vmap_small_pages_range_noflus
return 0;
}
-static int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
+/*
+ * vmap_pages_range_noflush is similar to vmap_pages_range, but does not
+ * flush caches.
+ *
+ * The caller is responsible for calling flush_cache_vmap() after this
+ * function returns successfully and before the addresses are accessed.
+ *
+ * This is an internal function only. Do not use outside mm/.
+ */
+int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
pgprot_t prot, struct page **pages, unsigned int page_shift)
{
unsigned int i, nr = (end - addr) >> PAGE_SHIFT;
@@ -549,48 +558,26 @@ static int vmap_pages_range_noflush(unsi
return 0;
}
-static int vmap_pages_range(unsigned long addr, unsigned long end,
- pgprot_t prot, struct page **pages, unsigned int page_shift)
-{
- int err;
-
- err = vmap_pages_range_noflush(addr, end, prot, pages, page_shift);
- flush_cache_vmap(addr, end);
- return err;
-}
-
/**
- * map_kernel_range_noflush - map kernel VM area with the specified pages
+ * vmap_pages_range - map pages to a kernel virtual address
* @addr: start of the VM area to map
- * @size: size of the VM area to map
+ * @end: end of the VM area to map (non-inclusive)
* @prot: page protection flags to use
- * @pages: pages to map
- *
- * Map PFN_UP(@size) pages at @addr. The VM area @addr and @size specify should
- * have been allocated using get_vm_area() and its friends.
- *
- * NOTE:
- * This function does NOT do any cache flushing. The caller is responsible for
- * calling flush_cache_vmap() on to-be-mapped areas before calling this
- * function.
+ * @pages: pages to map (always PAGE_SIZE pages)
+ * @page_shift: maximum shift that the pages may be mapped with, @pages must
+ * be aligned and contiguous up to at least this shift.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
-int map_kernel_range_noflush(unsigned long addr, unsigned long size,
- pgprot_t prot, struct page **pages)
-{
- return vmap_pages_range_noflush(addr, addr + size, prot, pages, PAGE_SHIFT);
-}
-
-int map_kernel_range(unsigned long start, unsigned long size, pgprot_t prot,
- struct page **pages)
+static int vmap_pages_range(unsigned long addr, unsigned long end,
+ pgprot_t prot, struct page **pages, unsigned int page_shift)
{
- int ret;
+ int err;
- ret = map_kernel_range_noflush(start, size, prot, pages);
- flush_cache_vmap(start, start + size);
- return ret;
+ err = vmap_pages_range_noflush(addr, end, prot, pages, page_shift);
+ flush_cache_vmap(addr, end);
+ return err;
}
int is_vmalloc_or_module_addr(const void *x)
@@ -2156,10 +2143,12 @@ void *vm_map_ram(struct page **pages, un
kasan_unpoison_vmalloc(mem, size);
- if (map_kernel_range(addr, size, PAGE_KERNEL, pages) < 0) {
+ if (vmap_pages_range(addr, addr + size, PAGE_KERNEL,
+ pages, PAGE_SHIFT) < 0) {
vm_unmap_ram(mem, count);
return NULL;
}
+
return mem;
}
EXPORT_SYMBOL(vm_map_ram);
@@ -2703,6 +2692,7 @@ void *vmap(struct page **pages, unsigned
unsigned long flags, pgprot_t prot)
{
struct vm_struct *area;
+ unsigned long addr;
unsigned long size; /* In bytes */
might_sleep();
@@ -2715,8 +2705,9 @@ void *vmap(struct page **pages, unsigned
if (!area)
return NULL;
- if (map_kernel_range((unsigned long)area->addr, size, pgprot_nx(prot),
- pages) < 0) {
+ addr = (unsigned long)area->addr;
+ if (vmap_pages_range(addr, addr + size, pgprot_nx(prot),
+ pages, PAGE_SHIFT) < 0) {
vunmap(area->addr);
return NULL;
}
_
Patches currently in -mm which might be from npiggin@xxxxxxxxx are
arm-mm-add-missing-pud_page-define-to-2-level-page-tables.patch
mm-vmalloc-fix-huge_vmap-regression-by-enabling-huge-pages-in-vmalloc_to_page.patch
mm-vmalloc-fix-huge_vmap-regression-by-enabling-huge-pages-in-vmalloc_to_page-fix.patch
mm-apply_to_pte_range-warn-and-fail-if-a-large-pte-is-encountered.patch
mm-vmalloc-rename-vmap__range-vmap_pages__range.patch
mm-ioremap-rename-ioremap__range-to-vmap__range.patch
mm-huge_vmap-arch-support-cleanup.patch
powerpc-inline-huge-vmap-supported-functions.patch
arm64-inline-huge-vmap-supported-functions.patch
x86-inline-huge-vmap-supported-functions.patch
mm-vmalloc-provide-fallback-arch-huge-vmap-support-functions.patch
mm-move-vmap_range-from-mm-ioremapc-to-mm-vmallocc.patch
mm-vmalloc-add-vmap_range_noflush-variant.patch
mm-vmalloc-hugepage-vmalloc-mappings.patch
powerpc-64s-radix-enable-huge-vmalloc-mappings.patch
mm-vmalloc-remove-map_kernel_range.patch
kernel-dma-remove-unnecessary-unmap_kernel_range.patch
powerpc-xive-remove-unnecessary-unmap_kernel_range.patch
mm-vmalloc-remove-unmap_kernel_range.patch
mm-vmalloc-improve-allocation-failure-error-messages.patch
