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Message-ID: <20160311225001.GA30106@linux.intel.com>
Date: Fri, 11 Mar 2016 15:50:01 -0700
From: Ross Zwisler <ross.zwisler@...ux.intel.com>
To: Dan Williams <dan.j.williams@...el.com>
Cc: akpm@...ux-foundation.org, Ingo Molnar <mingo@...nel.org>,
Tony Luck <tony.luck@...el.com>, linux-nvdimm@...ts.01.org,
Peter Zijlstra <peterz@...radead.org>,
linux-kernel@...r.kernel.org,
Andy Lutomirski <luto@...capital.net>, linux-mm@...ck.org,
Borislav Petkov <bp@...en8.de>,
Ross Zwisler <ross.zwisler@...ux.intel.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86, pmem: use memcpy_mcsafe() for memcpy_from_pmem()
On Thu, Mar 10, 2016 at 11:15:53AM -0800, Dan Williams wrote:
> Update the definition of memcpy_from_pmem() to return 0 or -EIO on
> error. Implement x86::arch_memcpy_from_pmem() with memcpy_mcsafe().
>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Tony Luck <tony.luck@...el.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Andy Lutomirski <luto@...capital.net>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
> Andrew, now that all the pre-requisites for this patch are in -next
> (tip/core/ras, tip/x86/asm, nvdimm/libnvdimm-for-next) may I ask you to
> carry it in -mm?
>
> Alternatively I can do an octopus merge and post a branch, but that
> seems messy/risky for me to be merging 3 branches that are still subject
> to a merge window disposition.
>
> arch/x86/include/asm/pmem.h | 9 +++++++++
> drivers/nvdimm/pmem.c | 4 ++--
> include/linux/pmem.h | 14 ++++++++------
> 3 files changed, 19 insertions(+), 8 deletions(-)
<>
> diff --git a/include/linux/pmem.h b/include/linux/pmem.h
> index 3ec5309e29f3..c46c5cf6538e 100644
> --- a/include/linux/pmem.h
> +++ b/include/linux/pmem.h
> @@ -66,14 +66,16 @@ static inline void arch_invalidate_pmem(void __pmem *addr, size_t size)
> #endif
>
> /*
> - * Architectures that define ARCH_HAS_PMEM_API must provide
> - * implementations for arch_memcpy_to_pmem(), arch_wmb_pmem(),
> - * arch_copy_from_iter_pmem(), arch_clear_pmem(), arch_wb_cache_pmem()
> - * and arch_has_wmb_pmem().
Why did you delete the above comment? I believe it adds value? Or do you
think the fact that another architecture will get compile errors if the arch_*
functions aren't defined is documentation enough?
> + * memcpy_from_pmem - read from persistent memory with error handling
> + * @dst: destination buffer
> + * @src: source buffer
Missing kerneldoc for @size?
Aside from those tiny nits:
Reviewed-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
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