powerpc/32: use set_memory_attr()

Use set_memory_attr() instead of the PPC32 specific change_page_attr()

change_page_attr() was checking that the address was not mapped by
blocks and was handling highmem, but that's unneeded because the
affected pages can't be in highmem and block mapping verification
is already done by the callers.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
[ruscur: rebase on powerpc/merge with Christophe's new patches]
Signed-off-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210609013431.9805-10-jniethe5@gmail.com
This commit is contained in:
Christophe Leroy 2021-06-09 11:34:31 +10:00 коммит произвёл Michael Ellerman
Родитель 4d1755b6a7
Коммит c988cfd38e
1 изменённых файлов: 10 добавлений и 50 удалений

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@ -23,6 +23,7 @@
#include <linux/highmem.h>
#include <linux/memblock.h>
#include <linux/slab.h>
#include <linux/set_memory.h>
#include <asm/pgalloc.h>
#include <asm/fixmap.h>
@ -132,64 +133,20 @@ void __init mapin_ram(void)
}
}
static int __change_page_attr_noflush(struct page *page, pgprot_t prot)
{
pte_t *kpte;
unsigned long address;
BUG_ON(PageHighMem(page));
address = (unsigned long)page_address(page);
if (v_block_mapped(address))
return 0;
kpte = virt_to_kpte(address);
if (!kpte)
return -EINVAL;
__set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);
return 0;
}
/*
* Change the page attributes of an page in the linear mapping.
*
* THIS DOES NOTHING WITH BAT MAPPINGS, DEBUG USE ONLY
*/
static int change_page_attr(struct page *page, int numpages, pgprot_t prot)
{
int i, err = 0;
unsigned long flags;
struct page *start = page;
local_irq_save(flags);
for (i = 0; i < numpages; i++, page++) {
err = __change_page_attr_noflush(page, prot);
if (err)
break;
}
wmb();
local_irq_restore(flags);
flush_tlb_kernel_range((unsigned long)page_address(start),
(unsigned long)page_address(page));
return err;
}
void mark_initmem_nx(void)
{
struct page *page = virt_to_page(_sinittext);
unsigned long numpages = PFN_UP((unsigned long)_einittext) -
PFN_DOWN((unsigned long)_sinittext);
if (v_block_mapped((unsigned long)_sinittext))
mmu_mark_initmem_nx();
else
change_page_attr(page, numpages, PAGE_KERNEL);
set_memory_attr((unsigned long)_sinittext, numpages, PAGE_KERNEL);
}
#ifdef CONFIG_STRICT_KERNEL_RWX
void mark_rodata_ro(void)
{
struct page *page;
unsigned long numpages;
if (v_block_mapped((unsigned long)_stext + 1)) {
@ -198,20 +155,18 @@ void mark_rodata_ro(void)
return;
}
page = virt_to_page(_stext);
numpages = PFN_UP((unsigned long)_etext) -
PFN_DOWN((unsigned long)_stext);
change_page_attr(page, numpages, PAGE_KERNEL_ROX);
set_memory_attr((unsigned long)_stext, numpages, PAGE_KERNEL_ROX);
/*
* mark .rodata as read only. Use __init_begin rather than __end_rodata
* to cover NOTES and EXCEPTION_TABLE.
*/
page = virt_to_page(__start_rodata);
numpages = PFN_UP((unsigned long)__init_begin) -
PFN_DOWN((unsigned long)__start_rodata);
change_page_attr(page, numpages, PAGE_KERNEL_RO);
set_memory_attr((unsigned long)__start_rodata, numpages, PAGE_KERNEL_RO);
// mark_initmem_nx() should have already run by now
ptdump_check_wx();
@ -221,9 +176,14 @@ void mark_rodata_ro(void)
#ifdef CONFIG_DEBUG_PAGEALLOC
void __kernel_map_pages(struct page *page, int numpages, int enable)
{
unsigned long addr = (unsigned long)page_address(page);
if (PageHighMem(page))
return;
change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
if (enable)
set_memory_attr(addr, numpages, PAGE_KERNEL);
else
set_memory_attr(addr, numpages, __pgprot(0));
}
#endif /* CONFIG_DEBUG_PAGEALLOC */