From: will.deacon@arm.com (Will Deacon) Date: Thu, 5 Aug 2010 11:36:47 +0100 Subject: [PATCH 0/2] Detect and handle I-cache aliases when D-cache is non-aliasing Message-ID: <1281004609-7563-1-git-send-email-will.deacon@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Last month, I posted some patches to fix ptrace software breakpoints: http://lists.infradead.org/pipermail/linux-arm-kernel/2010-July/020649.html One of these patches added a workaround for a hardware erratum, so I have submitted that to the patch system. The other patch simply called __flush_icache_all() in flush_ptrace_access to avoid having to worry about I-cache aliases when cache_is_vipt_nonaliasing() is true. This isn't ideal if the debugger decides to insert lots of software breakpoints sequentially (for example, when single-stepping a number of times). These two patches add proper identification of aliasing I-caches when the D-cache is nonaliasing. flush_ptrace_access can then flush only the relevant I-cache lines instead of the entire cache. Cc: Russell King - ARM Linux Cc: Catalin Marinas Will Deacon (2): ARM: setup: detect aliasing I-cache when D-cache is non-aliasing ARM: flush_ptrace_access: invalidate correct I-cache alias arch/arm/include/asm/cachetype.h | 8 ++++++-- arch/arm/kernel/setup.c | 38 +++++++++++++++++++++++++++++++++++--- arch/arm/mm/flush.c | 23 ++++++++++++++++++++--- 3 files changed, 61 insertions(+), 8 deletions(-)