From a248b13b21ae00b97638b4f435c8df3075808b5d Mon Sep 17 00:00:00 2001 From: Will Deacon <will.deacon@arm.com> Date: Thu, 26 May 2011 11:20:19 +0100 Subject: [PATCH] ARM: 6941/1: cache: ensure MVA is cacheline aligned in flush_kern_dcache_area The v6 and v7 implementations of flush_kern_dcache_area do not align the passed MVA to the size of a cacheline in the data cache. If a misaligned address is used, only a subset of the requested area will be flushed. This has been observed to cause failures in SMP boot where the secondary_data initialised by the primary CPU is not cacheline aligned, causing the secondary CPUs to read incorrect values for their pgd and stack pointers. This patch ensures that the base address is cacheline aligned before flushing the d-cache. Cc: <stable@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> --- arch/arm/mm/cache-v6.S | 1 + arch/arm/mm/cache-v7.S | 2 ++ 2 files changed, 3 insertions(+) diff --git a/arch/arm/mm/cache-v6.S b/arch/arm/mm/cache-v6.S index c96fa1b3f49f..73b4a8b66a57 100644 --- a/arch/arm/mm/cache-v6.S +++ b/arch/arm/mm/cache-v6.S @@ -176,6 +176,7 @@ ENDPROC(v6_coherent_kern_range) */ ENTRY(v6_flush_kern_dcache_area) add r1, r0, r1 + bic r0, r0, #D_CACHE_LINE_SIZE - 1 1: #ifdef HARVARD_CACHE mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S index dc18d81ef8ce..d32f02b61866 100644 --- a/arch/arm/mm/cache-v7.S +++ b/arch/arm/mm/cache-v7.S @@ -221,6 +221,8 @@ ENDPROC(v7_coherent_user_range) ENTRY(v7_flush_kern_dcache_area) dcache_line_size r2, r3 add r1, r0, r1 + sub r3, r2, #1 + bic r0, r0, r3 1: mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line / unified line add r0, r0, r2 -- 2.20.1