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* [patch 038/158] asm-generic/tlb: stub out pud_free_tlb() if nopud ...
@ 2019-12-01  1:51 akpm
  0 siblings, 0 replies; only message in thread
From: akpm @ 2019-12-01  1:51 UTC (permalink / raw)
  To: akpm, aneesh.kumar, arnd, kirill.shutemov, linux-mm, mm-commits,
	npiggin, peterz, torvalds, vgupta, Vineet.Gupta1, will

From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Subject: asm-generic/tlb: stub out pud_free_tlb() if nopud ...

... independent of __ARCH_HAS_4LEVEL_HACK

This came up when removing __ARCH_HAS_5LEVEL_HACK for ARC as code bloat.
With this patch we see the following code reduction

| bloat-o-meter2 vmlinux-B-elide-ARCH_USE_5LEVEL_HACK vmlinux-C-elide-pud_free_tlb
| add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-104 (-104)
| function                                     old     new   delta
| free_pgd_range                               656     552    -104
| Total: Before=4137276, After=4137172, chg -1.000000%

Note: The primary change is alternate defintion for pud_free_tlb() but
while there also removed empty stubs for __pud_free_tlb, which is anyhow
called only from pud_free_tlb()

Link: http://lkml.kernel.org/r/20191016162400.14796-3-vgupta@synopsys.com
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Nick Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/asm-generic/4level-fixup.h  |    1 -
 include/asm-generic/pgtable-nopud.h |    2 +-
 include/asm-generic/tlb.h           |    2 --
 3 files changed, 1 insertion(+), 4 deletions(-)

--- a/include/asm-generic/4level-fixup.h~asm-generic-tlb-stub-out-pud_free_tlb-if-nopud
+++ a/include/asm-generic/4level-fixup.h
@@ -30,7 +30,6 @@
 #undef pud_free_tlb
 #define pud_free_tlb(tlb, x, addr)	do { } while (0)
 #define pud_free(mm, x)			do { } while (0)
-#define __pud_free_tlb(tlb, x, addr)	do { } while (0)
 
 #undef  pud_addr_end
 #define pud_addr_end(addr, end)		(end)
--- a/include/asm-generic/pgtable-nopud.h~asm-generic-tlb-stub-out-pud_free_tlb-if-nopud
+++ a/include/asm-generic/pgtable-nopud.h
@@ -59,7 +59,7 @@ static inline pud_t *pud_offset(p4d_t *p
  */
 #define pud_alloc_one(mm, address)		NULL
 #define pud_free(mm, x)				do { } while (0)
-#define __pud_free_tlb(tlb, x, a)		do { } while (0)
+#define pud_free_tlb(tlb, x, a)		        do { } while (0)
 
 #undef  pud_addr_end
 #define pud_addr_end(addr, end)			(end)
--- a/include/asm-generic/tlb.h~asm-generic-tlb-stub-out-pud_free_tlb-if-nopud
+++ a/include/asm-generic/tlb.h
@@ -584,7 +584,6 @@ static inline void tlb_end_vma(struct mm
 	} while (0)
 #endif
 
-#ifndef __ARCH_HAS_4LEVEL_HACK
 #ifndef pud_free_tlb
 #define pud_free_tlb(tlb, pudp, address)			\
 	do {							\
@@ -594,7 +593,6 @@ static inline void tlb_end_vma(struct mm
 		__pud_free_tlb(tlb, pudp, address);		\
 	} while (0)
 #endif
-#endif
 
 #ifndef __ARCH_HAS_5LEVEL_HACK
 #ifndef p4d_free_tlb
_


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2019-12-01  1:51 [patch 038/158] asm-generic/tlb: stub out pud_free_tlb() if nopud akpm

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