Messages in this thread | | | Date | Mon, 20 Apr 2015 08:52:35 +0200 | From | Ingo Molnar <> | Subject | Re: [patch for 4.0] x86: silence warning in /dev/mem support |
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* Pavel Machek <pavel@ucw.cz> wrote:
> Hi! > > > > CC arch/x86/mm/ioremap.o > > > arch/x86/mm/ioremap.c: In function ‘xlate_dev_mem_ptr’: > > > arch/x86/mm/ioremap.c:363:10: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] > > > addr = (void *)((unsigned long)addr | (phys & ~PAGE_MASK)); > > > ^ > > > LD arch/x86/mm/built-in.o > > > > > > pavel@amd:/data/l/linux$ gcc --version > > > gcc (Debian 4.9.2-10) 4.9.2 > > > > So this code has not been changed for a year or so in theory, and I've > > never seen this warning with GCC 4.9.1. I'm wondering how it > > triggered. Could you send me your .config that triggers this? > > Config sent in private email. 32-bit kernel.
Ah, I see, the key is:
CONFIG_HIGHMEM64G=y
and neither x86 defconfig nor allyesconfig/allmodconfig selects HIGHMEM64G apparently, so this was rarely triggered.
Thanks,
Ingo
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