* [PATCH v2] MIPS: Do not flush tlb when setting pmd entry
@ 2020-06-18 10:56 Bibo Mao
0 siblings, 0 replies; only message in thread
From: Bibo Mao @ 2020-06-18 10:56 UTC (permalink / raw)
To: Thomas Bogendoerfer, Paul Burton, Mike Rapoport, Andrew Morton,
Daniel Silsby
Cc: linux-mips, linux-kernel
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:
1. privilege degrade such as wrprotect is set on the pmd entry
2. pmd entry is cleared
3. 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.
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
v2:
- add the same operation on mips32 system
- update changelog description
---
arch/mips/mm/pgtable-32.c | 1 -
arch/mips/mm/pgtable-64.c | 1 -
2 files changed, 2 deletions(-)
diff --git a/arch/mips/mm/pgtable-32.c b/arch/mips/mm/pgtable-32.c
index bd4b065..61891af 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 183ff9f..7536f78 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)
--
1.8.3.1
^ permalink raw reply related [flat|nested] only message in thread
only message in thread, other threads:[~2020-06-18 10:57 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-06-18 10:56 [PATCH v2] MIPS: Do not flush tlb when setting pmd entry Bibo Mao
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).