linux-kernel - Re: [PATCH 3/5] Removing dead CONFIG_SMP

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Message-ID: <20100610122311.GA3885@stud.informatik.uni-erlangen.de>
Date:	Thu, 10 Jun 2010 14:23:11 +0200
From:	Christoph Egger <siccegge@...fau.de>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, vamos@...informatik.uni-erlangen.de
Subject: Re: [PATCH 3/5] Removing dead CONFIG_SMP_750

On Thu, Jun 10, 2010 at 04:14:21PM +1000, Benjamin Herrenschmidt wrote:
> On Wed, 2010-06-09 at 08:35 -0400, Josh Boyer wrote:
> > On Wed, Jun 09, 2010 at 12:00:21PM +0200, Christoph Egger wrote:
> > >CONFIG_SMP_750 doesn't exist in Kconfig, therefore removing all
> > >references for it from the source code.
> > 
> > Yeah, we don't support SMP on 750 at the moment.  This code was carried over
> > from the arch/ppc days, and that code was present pre-git.  I think we can
> > drop it, but I'll leave that up to Ben.  Maybe he has crazy plans for a 750 SMP
> > board.
> 
> Nope :-) Though it would be nice to also remove the call sites too and
> thus remove the macro entirely.

SOmething like below?

-----
From: Christoph Egger <siccegge@...fau.de>
Subject: [PATCH 3/5] Removing dead CONFIG_SMP_750

CONFIG_SMP_750 doesn't exist in Kconfig, therefore removing all
references for it from the source code.

Signed-off-by: Christoph Egger <siccegge@...fau.de>

diff --git a/arch/powerpc/mm/tlb_hash32.c b/arch/powerpc/mm/tlb_hash32.c
index 8aaa8b7..09c7820 100644
--- a/arch/powerpc/mm/tlb_hash32.c
+++ b/arch/powerpc/mm/tlb_hash32.c
@@ -94,11 +94,6 @@ void tlb_flush(struct mmu_gather *tlb)
  * the cache operations on the bus.  Hence we need to use an IPI
  * to get the other CPU(s) to invalidate their TLBs.
  */
-#ifdef CONFIG_SMP_750
-#define FINISH_FLUSH   smp_send_tlb_invalidate(0)
-#else
-#define FINISH_FLUSH   do { } while (0)
-#endif
 
 static void flush_range(struct mm_struct *mm, unsigned long start,
                        unsigned long end)
@@ -138,7 +133,6 @@ static void flush_range(struct mm_struct *mm, unsigned long start,
 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
 {
        flush_range(&init_mm, start, end);
-       FINISH_FLUSH;
 }
 EXPORT_SYMBOL(flush_tlb_kernel_range);
 
@@ -162,7 +156,6 @@ void flush_tlb_mm(struct mm_struct *mm)
         */
        for (mp = mm->mmap; mp != NULL; mp = mp->vm_next)
                flush_range(mp->vm_mm, mp->vm_start, mp->vm_end);
-       FINISH_FLUSH;
 }
 EXPORT_SYMBOL(flush_tlb_mm);
 
@@ -179,7 +172,6 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
        pmd = pmd_offset(pud_offset(pgd_offset(mm, vmaddr), vmaddr), vmaddr);
        if (!pmd_none(*pmd))
                flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1);
-       FINISH_FLUSH;
 }
 EXPORT_SYMBOL(flush_tlb_page);
 
@@ -192,6 +184,5 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
                     unsigned long end)
 {
        flush_range(vma->vm_mm, start, end);
-       FINISH_FLUSH;
 }
 EXPORT_SYMBOL(flush_tlb_range);
-- 
1.6.3.3

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