Patch "sparc64: redefine first version" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

sparc64: redefine first version

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
sparc64-redefine-first-version.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Pavel Tatashin <[email protected]>
Date: Wed, 31 May 2017 11:25:22 -0400
Subject: sparc64: redefine first version

From: Pavel Tatashin <[email protected]>

[ Upstream commit c4415235b2be0cc791572e8e7f7466ab8f73a2bf ]

CTX_FIRST_VERSION defines the first context version, but also it defines first context. This patch redefines it to only include the first context version.

---
 arch/sparc/include/asm/mmu_64.h |    2 +-
 arch/sparc/mm/init_64.c         |    6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

@@ -52,7 +52,7 @@
 #define CTX_NR_MASK		TAG_CONTEXT_BITS
 #define CTX_HW_MASK		(CTX_NR_MASK | CTX_PGSZ_MASK)
 
-#define CTX_FIRST_VERSION	((_AC(1,UL) << CTX_VERSION_SHIFT) + _AC(1,UL))
+#define CTX_FIRST_VERSION	BIT(CTX_VERSION_SHIFT)
 #define CTX_VALID(__ctx)	\
 	 (!(((__ctx.sparc64_ctx_val) ^ tlb_context_cache) & CTX_VERSION_MASK))
 #define CTX_HWBITS(__ctx)	((__ctx.sparc64_ctx_val) & CTX_HW_MASK)

@@ -656,7 +656,7 @@ EXPORT_SYMBOL(__flush_dcache_range);
 
 /* get_new_mmu_context() uses "cache + 1".  */
 DEFINE_SPINLOCK(ctx_alloc_lock);
-unsigned long tlb_context_cache = CTX_FIRST_VERSION - 1;
+unsigned long tlb_context_cache = CTX_FIRST_VERSION;
 #define MAX_CTX_NR	(1UL << CTX_NR_BITS)
 #define CTX_BMAP_SLOTS	BITS_TO_LONGS(MAX_CTX_NR)
 DECLARE_BITMAP(mmu_context_bmap, MAX_CTX_NR);

@@ -687,9 +687,9 @@ void get_new_mmu_context(struct mm_struc
 		if (new_ctx >= ctx) {
 			int i;
 			new_ctx = (tlb_context_cache & CTX_VERSION_MASK) +
-				CTX_FIRST_VERSION;
+				CTX_FIRST_VERSION + 1;
 			if (new_ctx == 1)
-				new_ctx = CTX_FIRST_VERSION;
+				new_ctx = CTX_FIRST_VERSION + 1;
 
 			/* Don't call memset, for 16 entries that's just
 			 * plain silly...

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/sparc64-new-context-wrap.patch queue-4.4/sparc64-combine-activate_mm-and-switch_mm.patch queue-4.4/sparc64-add-per-cpu-mm-of-secondary-contexts.patch queue-4.4/sparc64-reset-mm-cpumask-after-wrap.patch queue-4.4/sparc64-redefine-first-version.patch queue-4.4/sparc64-delete-old-wrap-code.patch