diff options
| author | Bibo Mao <maobibo@loongson.cn> | 2021-02-24 12:06:46 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-24 13:38:32 -0800 |
| commit | aba677f94b7d1004a9477464d78111d9082546f9 (patch) | |
| tree | 8ea8c8510cea4211a722a6a7be9c03318c97f394 | |
| parent | fca40573e0f742dfd81cf20b8a7c6ce0e543b8b6 (diff) | |
| download | linux-aba677f94b7d1004a9477464d78111d9082546f9.tar.bz2 | |
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>
| -rw-r--r-- | arch/mips/mm/pgtable-32.c | 1 | ||||
| -rw-r--r-- | arch/mips/mm/pgtable-64.c | 1 |
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) |