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----- Forwarded message from "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> -----
Date: Thu, 12 Oct 2023 20:54:15 +0100
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
To: linux-kernel@xxxxxxxxxxxxxxx
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>,
linux-sparc@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, Michael
Ellerman <mpe@xxxxxxxxxxxxxx>, Erhard Furtner <erhard_f@xxxxxxxxxxx>,
David Woodhouse <dwmw2@xxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>
Subject: [PATCH 2/2] sparc: Allow nesting of lazy MMU mode
X-Mailer: git-send-email 2.37.1
As noted in commit 49147beb0ccb ("x86/xen: allow nesting of same lazy
mode"), we can now nest calls to arch_enter_lazy_mmu_mode(). Use ->active
as a counter instead of a flag and only drain the batch when the counter
hits 0.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Fixes: bcc6cc832573 ("mm: add default definition of set_ptes()")
---
arch/sparc/mm/tlb.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/sparc/mm/tlb.c b/arch/sparc/mm/tlb.c
index b44d79d778c7..a82c7c32e47d 100644
--- a/arch/sparc/mm/tlb.c
+++ b/arch/sparc/mm/tlb.c
@@ -54,16 +54,15 @@ void arch_enter_lazy_mmu_mode(void)
{
struct tlb_batch *tb = this_cpu_ptr(&tlb_batch);
- tb->active = 1;
+ tb->active++;
}
void arch_leave_lazy_mmu_mode(void)
{
struct tlb_batch *tb = this_cpu_ptr(&tlb_batch);
- if (tb->tlb_nr)
+ if ((--tb->active == 0) && tb->tlb_nr)
flush_tlb_pending();
- tb->active = 0;
}
static void tlb_batch_add_one(struct mm_struct *mm, unsigned long vaddr,
--
2.40.1
----- End forwarded message -----
