* Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> [091219 01:04]: > On Fri, Dec 18, 2009 at 07:46:19PM -0800, Tony Lindgren wrote: > > diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c > > index 8c7fbd1..a2802ea 100644 > > --- a/arch/arm/mm/mmu.c > > +++ b/arch/arm/mm/mmu.c > > @@ -1068,4 +1068,7 @@ void setup_mm_for_reboot(char mode) > > pmd[1] = __pmd(pmdval + (1 << (PGDIR_SHIFT - 1))); > > flush_pmd_entry(pmd); > > } > > + > > + local_flush_tlb_all(); > > + flush_cache_all(); > > The cache flush is unnecessary. The caches should be off at this point. OK, right, cpu_proc_fin() has already disabled caches by then. Here's the updated version. Tony
>From f279fdc4c7dc824902d67511bfcb5f18512c8468 Mon Sep 17 00:00:00 2001 From: Tony Lindgren <tony@xxxxxxxxxxx> Date: Fri, 18 Dec 2009 17:10:51 -0800 Subject: [PATCH] arm: Flush TLB entries in setup_mm_for_reboot() We need to do that if we tinker with the MMU entries. This fixes the occasional bug with kexec where the new fails to uncompress with "crc error". Most likely at least kexec on v6 and v7 need this fix. Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx> diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 8c7fbd1..a311080 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -1068,4 +1068,6 @@ void setup_mm_for_reboot(char mode) pmd[1] = __pmd(pmdval + (1 << (PGDIR_SHIFT - 1))); flush_pmd_entry(pmd); } + + local_flush_tlb_all(); }
