diff mbox series

[v8,7/7] powerpc/32: use set_memory_attr()

Message ID 20200402084053.188537-7-ruscur@russell.cc (mailing list archive)
State Changes Requested
Headers show
Series [v8,1/7] powerpc/mm: Implement set_memory() routines | expand

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Context Check Description
snowpatch_ozlabs/apply_patch success Successfully applied on branch powerpc/merge (d0c12846a3a24cd6d68b608c866712bc7e471634)
snowpatch_ozlabs/build-ppc64le success Build succeeded
snowpatch_ozlabs/build-ppc64be success Build succeeded
snowpatch_ozlabs/build-ppc64e success Build succeeded
snowpatch_ozlabs/build-pmac32 fail build failed!
snowpatch_ozlabs/checkpatch success total: 0 errors, 0 warnings, 0 checks, 109 lines checked
snowpatch_ozlabs/needsstable success Patch has no Fixes tags

Commit Message

Russell Currey April 2, 2020, 8:40 a.m. UTC 
From: Christophe Leroy <christophe.leroy@c-s.fr>

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@c-s.fr>
[ruscur: rebase on powerpc/merge with Christophe's new patches]
Signed-off-by: Russell Currey <ruscur@russell.cc>
---
v8: Rebase on powerpc/merge

 arch/powerpc/mm/pgtable_32.c | 60 ++++++------------------------------
 1 file changed, 10 insertions(+), 50 deletions(-)
diff mbox series

Patch

diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index f62de06e3d07..0d9d164fad26 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -23,6 +23,7 @@ 
 #include <linux/highmem.h>
 #include <linux/memblock.h>
 #include <linux/slab.h>
+#include <linux/set_memory.h>
 
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
@@ -121,64 +122,20 @@  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)_stext + 1))
 		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)_sinittext)) {
@@ -187,20 +144,18 @@  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();
@@ -210,9 +165,14 @@  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 */