From 34fc0e89a2139ef7ccf7be8569ce617e8abe12fa Mon Sep 17 00:00:00 2001 From: James Clarke Date: Wed, 29 May 2019 22:31:31 +0100 Subject: [PATCH] sparc64: Fix regression in non-hypervisor TLB flush xcall commit d3c976c14ad8af421134c428b0a89ff8dd3bd8f8 upstream. Previously, %g2 would end up with the value PAGE_SIZE, but after the commit mentioned below it ends up with the value 1 due to being reused for a different purpose. We need it to be PAGE_SIZE as we use it to step through pages in our demap loop, otherwise we set different flags in the low 12 bits of the address written to, thereby doing things other than a nucleus page flush. Fixes: a74ad5e660a9 ("sparc64: Handle extremely large kernel TLB range flushes more gracefully.") Reported-by: Meelis Roos Tested-by: Meelis Roos Signed-off-by: James Clarke Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- arch/sparc/mm/ultra.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/sparc/mm/ultra.S b/arch/sparc/mm/ultra.S index d245f89d1395..d220b6848746 100644 --- a/arch/sparc/mm/ultra.S +++ b/arch/sparc/mm/ultra.S @@ -587,7 +587,7 @@ xcall_flush_tlb_kernel_range: /* 44 insns */ sub %g7, %g1, %g3 srlx %g3, 18, %g2 brnz,pn %g2, 2f - add %g2, 1, %g2 + sethi %hi(PAGE_SIZE), %g2 sub %g3, %g2, %g3 or %g1, 0x20, %g1 ! Nucleus 1: stxa %g0, [%g1 + %g3] ASI_DMMU_DEMAP @@ -751,7 +751,7 @@ __cheetah_xcall_flush_tlb_kernel_range: /* 44 insns */ sub %g7, %g1, %g3 srlx %g3, 18, %g2 brnz,pn %g2, 2f - add %g2, 1, %g2 + sethi %hi(PAGE_SIZE), %g2 sub %g3, %g2, %g3 or %g1, 0x20, %g1 ! Nucleus 1: stxa %g0, [%g1 + %g3] ASI_DMMU_DEMAP -- 2.20.1