linux-kernel - linux-next: manual merge of the hyperv tree with Linus' tree

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Date:   Tue, 9 Jul 2019 19:53:58 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: linux-next: manual merge of the hyperv tree with Linus' tree

Hi all,

Today's linux-next merge of the hyperv tree got a conflict in:

  arch/x86/include/asm/mshyperv.h

between commit:

  dd2cb348613b ("clocksource/drivers: Continue making Hyper-V clocksource ISA agnostic")

from Linus' tree and commit:

  765e33f5211a ("Drivers: hv: vmbus: Break out ISA independent parts of mshyperv.h")

from the hyperv tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc arch/x86/include/asm/mshyperv.h
index f4fa8a9d5d0b,080a92025748..000000000000
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@@ -397,4 -246,76 +256,6 @@@ static inline int hyperv_flush_guest_ma
  }
  #endif /* CONFIG_HYPERV */
  
 -#ifdef CONFIG_HYPERV_TSCPAGE
 -struct ms_hyperv_tsc_page *hv_get_tsc_page(void);
 -static inline u64 hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg,
 -				       u64 *cur_tsc)
 -{
 -	u64 scale, offset;
 -	u32 sequence;
 -
 -	/*
 -	 * The protocol for reading Hyper-V TSC page is specified in Hypervisor
 -	 * Top-Level Functional Specification ver. 3.0 and above. To get the
 -	 * reference time we must do the following:
 -	 * - READ ReferenceTscSequence
 -	 *   A special '0' value indicates the time source is unreliable and we
 -	 *   need to use something else. The currently published specification
 -	 *   versions (up to 4.0b) contain a mistake and wrongly claim '-1'
 -	 *   instead of '0' as the special value, see commit c35b82ef0294.
 -	 * - ReferenceTime =
 -	 *        ((RDTSC() * ReferenceTscScale) >> 64) + ReferenceTscOffset
 -	 * - READ ReferenceTscSequence again. In case its value has changed
 -	 *   since our first reading we need to discard ReferenceTime and repeat
 -	 *   the whole sequence as the hypervisor was updating the page in
 -	 *   between.
 -	 */
 -	do {
 -		sequence = READ_ONCE(tsc_pg->tsc_sequence);
 -		if (!sequence)
 -			return U64_MAX;
 -		/*
 -		 * Make sure we read sequence before we read other values from
 -		 * TSC page.
 -		 */
 -		smp_rmb();
 -
 -		scale = READ_ONCE(tsc_pg->tsc_scale);
 -		offset = READ_ONCE(tsc_pg->tsc_offset);
 -		*cur_tsc = rdtsc_ordered();
 -
 -		/*
 -		 * Make sure we read sequence after we read all other values
 -		 * from TSC page.
 -		 */
 -		smp_rmb();
 -
 -	} while (READ_ONCE(tsc_pg->tsc_sequence) != sequence);
 -
 -	return mul_u64_u64_shr(*cur_tsc, scale, 64) + offset;
 -}
 -
 -static inline u64 hv_read_tsc_page(const struct ms_hyperv_tsc_page *tsc_pg)
 -{
 -	u64 cur_tsc;
 -
 -	return hv_read_tsc_page_tsc(tsc_pg, &cur_tsc);
 -}
 -
 -#else
 -static inline struct ms_hyperv_tsc_page *hv_get_tsc_page(void)
 -{
 -	return NULL;
 -}
 -
 -static inline u64 hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg,
 -				       u64 *cur_tsc)
 -{
 -	BUG();
 -	return U64_MAX;
 -}
 -#endif
 -
+ #include <asm-generic/mshyperv.h>
+ 
  #endif

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