diff mbox series

[willy@infradead.org:,[PATCH,2/2] sparc: Allow nesting of lazy MMU mode]

Message ID ZShPKbi30H3yYd31@casper.infradead.org
State New
Headers show
Series None | expand

Commit Message

Matthew Wilcox Oct. 12, 2023, 7:55 p.m. UTC 
Oops, wrong email address.

----- Forwarded message from "Matthew Wilcox (Oracle)" <willy@infradead.org> -----

Date: Thu, 12 Oct 2023 20:54:15 +0100
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: linux-kernel@vger.kernel.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
	linux-sparc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Michael
	Ellerman <mpe@ellerman.id.au>, Erhard Furtner <erhard_f@mailbox.org>,
	David Woodhouse <dwmw2@infradead.org>, Juergen Gross <jgross@suse.com>
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@infradead.org>
Fixes: bcc6cc832573 ("mm: add default definition of set_ptes()")
---
 arch/sparc/mm/tlb.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
diff mbox series

Patch

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,