On 2014/1/22 20:56, Vaibhav Bedia wrote: > On Wed, Jan 22, 2014 at 6:25 AM, Wang Nan <[email protected] > <mailto:[email protected]>> wrote: > > ARM's kdump is actually corrupted (at least for omap4460), mainly because > of > cache problem: flush_icache_range can't reliably ensure the copied data > correctly goes into RAM. After mmu turned off and jump to the trampoline, > kexec > always failed due to random undef instructions. > > This patch use ioremap to make sure the destnation of all memcpy() is > uncachable memory, including copying of target kernel and trampoline. > > > AFAIK ioremap on RAM in forbidden in ARM and device memory that ioremap() > ends up creating is not meant for executable code. > > Doesn't this trigger the WARN_ON() in _arm_ioremap_pfn_caller)?
This patch is depend on the previous one: ARM: Premit ioremap() to map reserved pages However, Russell is opposed to it. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
