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authorBibo Mao <maobibo@loongson.cn>2021-02-24 12:06:46 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-24 13:38:32 -0800
commitaba677f94b7d1004a9477464d78111d9082546f9 (patch)
tree8ea8c8510cea4211a722a6a7be9c03318c97f394 /arch/mips/mm
parentfca40573e0f742dfd81cf20b8a7c6ce0e543b8b6 (diff)
MIPS: do not call flush_tlb_all when setting pmd entry
Function set_pmd_at is to set pmd entry, if tlb entry need to be flushed, there exists pmdp_huge_clear_flush alike function before set_pmd_at is called. So it is not necessary to call flush_tlb_all in this function. In these scenarios, tlb for the pmd range needs to be flushed: - privilege degrade such as wrprotect is set on the pmd entry - pmd entry is cleared - there is exception if set_pmd_at is issued by dup_mmap, since flush_tlb_mm is called for parent process, it is not necessary to flush tlb in function copy_huge_pmd. Link: http://lkml.kernel.org/r/1592990792-1923-3-git-send-email-maobibo@loongson.cn Signed-off-by: Bibo Mao <maobibo@loongson.cn> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Daniel Silsby <dansilsby@gmail.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Paul Burton <paulburton@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/mips/mm')
-rw-r--r--arch/mips/mm/pgtable-32.c1
-rw-r--r--arch/mips/mm/pgtable-64.c1
2 files changed, 0 insertions, 2 deletions
diff --git a/arch/mips/mm/pgtable-32.c b/arch/mips/mm/pgtable-32.c
index bd4b0656add3..61891af25019 100644
--- a/arch/mips/mm/pgtable-32.c
+++ b/arch/mips/mm/pgtable-32.c
@@ -45,7 +45,6 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t pmd)
{
*pmdp = pmd;
- flush_tlb_all();
}
#endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */
diff --git a/arch/mips/mm/pgtable-64.c b/arch/mips/mm/pgtable-64.c
index 183ff9f9c026..7536f7804c44 100644
--- a/arch/mips/mm/pgtable-64.c
+++ b/arch/mips/mm/pgtable-64.c
@@ -100,7 +100,6 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t pmd)
{
*pmdp = pmd;
- flush_tlb_all();
}
void __init pagetable_init(void)